GPU/Internal Registers

Overview

GPU internal registers are written to through GPU commands. They are used to control the GPU's behavior, that is to say tell it to draw stuff and how we want it drawn.

Each command is at least 8 bytes wide. The first word is the command parameter and the second word constitutes the command header. Optionally, more parameter words may follow (potentially including a padding word to align commands to multiples of 8 bytes).

In the simplest case, a command is exactly 8 bytes wide. You can think of such a command as writing the parameter word to an internal register (the index of which is given in the command header). The more general case where more than one parameter word is given is equivalent to multiple simple commands (one for each parameter word). If consecutive writing mode is enabled in the command header, the current command index will be incremented after each parameter write. Otherwise, the parameters will be consecutively written to the same register.

For example, the sequence "0xAAAAAAAA 0x802F011C 0xBBBBBBBB 0xCCCCCCCC" is equivalent to a call to commands 0xF011C with parameter 0xAAAAAAAA, 0xF011D with parameter 0xBBBBBBBB and 0xF011E with parameter 0xCCCCCCCC. If consecutive writing mode were disabled, the command would be equivalent to three consecutive calls to 0xF011C (once with parameter 0xAAAAAAAA, once with 0xBBBBBBBB, and finally with 0xCCCCCCCC).

Invalid GPU command parameters including NaN floats can cause the GPU to hang, which then causes the GSP module to hang as well.

The size of GPU command buffers must be 0x10-byte aligned; the lower 3 bits of the size are cleared. A common pitfall is having the finalization command (write to register 0x0010) not executed because it was the last 8 bytes of a non-0x10 byte aligned command buffer, and having the GPU hang as a result.

Command Header

Bit	Description
0-15	Command ID
16-19	Parameter mask
20-30	Number of extra parameters (may be zero)
31	Consecutive writing mode

Parameter masking

Using a value other than 0xF, parts of a word in internal GPU memory can be updated without touching the other bits of it. For example, setting bit 16 to zero indicates that the least significant byte of the parameter will not be overwritten, setting bit 17 to zero indicates that the parameter's second LSB will not be overwritten, etc. This means that for instance commands 0x00010107 and 0x00020107 refer to the same thing but write different parts of the parameter.

Types

There are three main types of registers :

• configuration registers, which directly map to various rendering properties (for example: GPUREG_FACECULLING_CONFIG)
• data transfer registers, which can be seen as FIFOs that let us send sequential chunks of data to the GPU, such as shader code or 1D samplers (for example: GPUREG_GSH_CODETRANSFER_DATA)
• action triggering registers, which tell the GPU to do something, like draw a primitive (for example: GPUREG_DRAWARRAYS)

Aliases

It is possible for multiple register (sequential) IDs to correspond to the same register. This is done to leverage the consecutive writing mode for GPU commands, which makes it possible for a single command to write data to multiple sequential register IDs. For example, register IDs 02C1 through 02C8 all correspond to GPUREG_VSH_FLOATUNIFORM_DATAi so that a consecutively writing command based at 02C0 will write its first parameter to GPUREG_VSH_FLOATUNIFORM_INDEX and ever subsequent ones to GPUREG_VSH_FLOATUNIFORM_DATAi

Data Types

Name	Description
signed	Signed integer
unsigned	Unsigned integer
floatX.Y.Z	Floating-point number with X sign bits, Y exponent bits, and Z mantissa bits
fixedX.Y.Z	Fixed-point number with X sign bits, Y integer bits, and Z fractional bits

Register list

Miscellaneous registers (0x000-0x03F)

Register ID	Register name	Notes	Official Name
0000	GPUREG_0000
0001	GPUREG_0001
0002	GPUREG_0002
0003	GPUREG_0003
0004	GPUREG_0004
0005	GPUREG_0005
0006	GPUREG_0006
0007	GPUREG_0007
0008	GPUREG_0008
0009	GPUREG_0009
000A	GPUREG_000A
000B	GPUREG_000B
000C	GPUREG_000C
000D	GPUREG_000D
000E	GPUREG_000E
000F	GPUREG_000F
0010	GPUREG_FINALIZE		PICA_REG_INTERRUPT
0011	GPUREG_0011
0012	GPUREG_0012
0013	GPUREG_0013
0014	GPUREG_0014
0015	GPUREG_0015
0016	GPUREG_0016
0017	GPUREG_0017
0018	GPUREG_0018
0019	GPUREG_0019
001A	GPUREG_001A
001B	GPUREG_001B
001C	GPUREG_001C
001D	GPUREG_001D
001E	GPUREG_001E
001F	GPUREG_001F
0020	GPUREG_0020
0021	GPUREG_0021
0022	GPUREG_0022
0023	GPUREG_0023
0024	GPUREG_0024
0025	GPUREG_0025
0026	GPUREG_0026
0027	GPUREG_0027
0028	GPUREG_0028
0029	GPUREG_0029
002A	GPUREG_002A
002B	GPUREG_002B
002C	GPUREG_002C
002D	GPUREG_002D
002E	GPUREG_002E
002F	GPUREG_002F
0030	GPUREG_0030
0031	GPUREG_0031
0032	GPUREG_0032
0033	GPUREG_0033
0034	GPUREG_0034
0035	GPUREG_0035
0036	GPUREG_0036
0037	GPUREG_0037
0038	GPUREG_0038
0039	GPUREG_0039
003A	GPUREG_003A
003B	GPUREG_003B
003C	GPUREG_003C
003D	GPUREG_003D
003E	GPUREG_003E
003F	GPUREG_003F

Rasterizer registers (0x040-0x07F)

Register ID	Register name	Notes	Official Name
0040	GPUREG_FACECULLING_CONFIG		PICA_REG_CULL_FACE
0041	GPUREG_VIEWPORT_WIDTH		PICA_REG_VIEWPORT_WIDTH1
0042	GPUREG_VIEWPORT_INVW		PICA_REG_VIEWPORT_WIDTH2
0043	GPUREG_VIEWPORT_HEIGHT		PICA_REG_VIEWPORT_HEIGHT1
0044	GPUREG_VIEWPORT_INVH		PICA_REG_VIEWPORT_HEIGHT2
0045	GPUREG_0045
0046	GPUREG_0046
0047	GPUREG_FRAGOP_CLIP	?	PICA_REG_FRAGOP_CLIP
0048	GPUREG_FRAGOP_CLIP_DATA0	?	PICA_REG_FRAGOP_CLIP_DATA1
0049	GPUREG_FRAGOP_CLIP_DATA1	?	PICA_REG_FRAGOP_CLIP_DATA2
004A	GPUREG_FRAGOP_CLIP_DATA2	?	PICA_REG_FRAGOP_CLIP_DATA3
004B	GPUREG_FRAGOP_CLIP_DATA3	?	PICA_REG_FRAGOP_CLIP_DATA4
004C	GPUREG_004C
004D	GPUREG_DEPTHMAP_SCALE	As f24	PICA_REG_FRAGOP_WSCALE_DATA1
004E	GPUREG_DEPTHMAP_OFFSET	As f24	PICA_REG_FRAGOP_WSCALE_DATA2
004F	GPUREG_SH_OUTMAP_TOTAL		PICA_REG_GS_OUT_REG_NUM0 / PICA_REG_VS_OUT_REG_NUM0
0050	GPUREG_SH_OUTMAP_O0		PICA_REG_GS_OUT_ATTR0 / PICA_REG_VS_OUT_ATTR0
0051	GPUREG_SH_OUTMAP_O1		PICA_REG_GS_OUT_ATTR1 / PICA_REG_VS_OUT_ATTR1
0052	GPUREG_SH_OUTMAP_O2		PICA_REG_GS_OUT_ATTR2 / PICA_REG_VS_OUT_ATTR2
0053	GPUREG_SH_OUTMAP_O3		PICA_REG_GS_OUT_ATTR3 / PICA_REG_VS_OUT_ATTR3
0054	GPUREG_SH_OUTMAP_O4		PICA_REG_GS_OUT_ATTR4 / PICA_REG_VS_OUT_ATTR4
0055	GPUREG_SH_OUTMAP_O5		PICA_REG_GS_OUT_ATTR5 / PICA_REG_VS_OUT_ATTR5
0056	GPUREG_SH_OUTMAP_O6		PICA_REG_GS_OUT_ATTR6 / PICA_REG_VS_OUT_ATTR6
0057	GPUREG_0057
0058	GPUREG_0058
0059	GPUREG_0059
005A	GPUREG_005A
005B	GPUREG_005B
005C	GPUREG_005C
005D	GPUREG_005D
005E	GPUREG_005E
005F	GPUREG_005F
0060	GPUREG_0060
0061	GPUREG_EARLYDEPTH_FUNC	?	PICA_REG_EARLY_DEPTH_FUNC
0062	GPUREG_EARLYDEPTH_TEST1	?	PICA_REG_EARLY_DEPTH_TEST1
0063	GPUREG_EARLYDEPTH_CLEAR		PICA_REG_EARLY_DEPTH_CLEAR
0064	GPUREG_SH_OUTATTR_MODE	?	PICA_REG_GS_OUT_ATTR_MODE / PICA_REG_VS_OUT_ATTR_MODE
0065	GPUREG_SCISSORTEST_MODE		PICA_REG_SCISSOR
0066	GPUREG_SCISSORTEST_POS		PICA_REG_SCISSOR_XY
0067	GPUREG_SCISSORTEST_DIM		PICA_REG_SCISSOR_SIZE
0068	GPUREG_VIEWPORT_XY		PICA_REG_VIEWPORT_XY
0069	GPUREG_0069
006A	GPUREG_EARLYDEPTH_DATA		PICA_REG_EARLY_DEPTH_DATA
006B	GPUREG_006B
006C	GPUREG_006C
006D	GPUREG_DEPTHMAP_ENABLE	?	PICA_REG_FRAGOP_WSCALE
006E	GPUREG_RENDERBUF_DIM	?	PICA_REG_RENDER_BUF_RESOLUTION1
006F	GPUREG_SH_OUTATTR_CLOCK	?	PICA_REG_GS_OUT_ATTR_CLK / PICA_REG_VS_OUT_ATTR_CLK
0070	GPUREG_0070
0071	GPUREG_0071
0072	GPUREG_0072
0073	GPUREG_0073
0074	GPUREG_0074
0075	GPUREG_0075
0076	GPUREG_0076
0077	GPUREG_0077
0078	GPUREG_0078
0079	GPUREG_0079
007A	GPUREG_007A
007B	GPUREG_007B
007C	GPUREG_007C
007D	GPUREG_007D
007E	GPUREG_007E
007F	GPUREG_007F

Texturing registers (0x080-0x0FF)

Register ID	Register name	Notes	Official Name
0080	GPUREG_TEXUNIT_CONFIG		PICA_REG_TEXTURE_FUNC
0081	GPUREG_TEXUNIT0_BORDER_COLOR		PICA_REG_TEXTURE0_BORDER_COLOR
0082	GPUREG_TEXUNIT0_DIM		PICA_REG_TEXTURE0_SIZE
0083	GPUREG_TEXUNIT0_PARAM		PICA_REG_TEXTURE0_WRAP_FILTER
0084	GPUREG_TEXUNIT0_LOD	?	PICA_REG_TEXTURE0_LOD
0085	GPUREG_TEXUNIT0_ADDR1		PICA_REG_TEXTURE0_ADDR1
0086	GPUREG_TEXUNIT0_ADDR2		PICA_REG_TEXTURE0_ADDR2
0087	GPUREG_TEXUNIT0_ADDR3		PICA_REG_TEXTURE0_ADDR3
0088	GPUREG_TEXUNIT0_ADDR4		PICA_REG_TEXTURE0_ADDR4
0089	GPUREG_TEXUNIT0_ADDR5		PICA_REG_TEXTURE0_ADDR5
008A	GPUREG_TEXUNIT0_ADDR6		PICA_REG_TEXTURE0_ADDR6
008B	GPUREG_TEXUNIT0_SHADOW	?	PICA_REG_TEXTURE0_SHADOW
008C	GPUREG_008C
008D	GPUREG_008D
008E	GPUREG_TEXUNIT0_TYPE	?	PICA_REG_TEXTURE0_FORMAT
008F	GPUREG_LIGHTING_ENABLE0	?	PICA_REG_FRAG_LIGHT_EN0
0090	GPUREG_0090
0091	GPUREG_TEXUNIT1_BORDER_COLOR		PICA_REG_TEXTURE1_BORDER_COLOR
0092	GPUREG_TEXUNIT1_DIM		PICA_REG_TEXTURE1_SIZE
0093	GPUREG_TEXUNIT1_PARAM		PICA_REG_TEXTURE1_WRAP_FILTER
0094	GPUREG_TEXUNIT1_LOD	?	PICA_REG_TEXTURE1_LOD
0095	GPUREG_TEXUNIT1_ADDR		PICA_REG_TEXTURE1_ADDR
0096	GPUREG_TEXUNIT1_TYPE		PICA_REG_TEXTURE1_FORMAT
0097	GPUREG_0097
0098	GPUREG_0098
0099	GPUREG_TEXUNIT2_BORDER_COLOR		PICA_REG_TEXTURE2_BORDER_COLOR
009A	GPUREG_TEXUNIT2_DIM		PICA_REG_TEXTURE2_SIZE
009B	GPUREG_TEXUNIT2_PARAM		PICA_REG_TEXTURE2_WRAP_FILTER
009C	GPUREG_TEXUNIT2_LOD	?	PICA_REG_TEXTURE2_LOD
009D	GPUREG_TEXUNIT2_ADDR		PICA_REG_TEXTURE2_ADDR
009E	GPUREG_TEXUNIT2_TYPE		PICA_REG_TEXTURE2_FORMAT
009F	GPUREG_009F
00A0	GPUREG_00A0
00A1	GPUREG_00A1
00A2	GPUREG_00A2
00A3	GPUREG_00A3
00A4	GPUREG_00A4
00A5	GPUREG_00A5
00A6	GPUREG_00A6
00A7	GPUREG_00A7
00A8	GPUREG_TEXUNIT3_PROCTEX0	?	PICA_REG_TEXTURE3_PROCTEX0
00A9	GPUREG_TEXUNIT3_PROCTEX1	?	PICA_REG_TEXTURE3_PROCTEX1
00AA	GPUREG_TEXUNIT3_PROCTEX2	?	PICA_REG_TEXTURE3_PROCTEX2
00AB	GPUREG_TEXUNIT3_PROCTEX3	?	PICA_REG_TEXTURE3_PROCTEX3
00AC	GPUREG_TEXUNIT3_PROCTEX4	?	PICA_REG_TEXTURE3_PROCTEX4
00AD	GPUREG_TEXUNIT3_PROCTEX5	?	PICA_REG_TEXTURE3_PROCTEX5
00AE	GPUREG_00AE
00AF	GPUREG_PROCTEX_LUT	?	PICA_REG_PROCTEX_LUT
00B0	GPUREG_PROCTEX_LUT_DATA0	?	PICA_REG_PROCTEX_LUT_DATA0
00B1	GPUREG_PROCTEX_LUT_DATA1	?	PICA_REG_PROCTEX_LUT_DATA1
00B2	GPUREG_PROCTEX_LUT_DATA2	?	PICA_REG_PROCTEX_LUT_DATA2
00B3	GPUREG_PROCTEX_LUT_DATA3	?	PICA_REG_PROCTEX_LUT_DATA3
00B4	GPUREG_PROCTEX_LUT_DATA4	?	PICA_REG_PROCTEX_LUT_DATA4
00B5	GPUREG_PROCTEX_LUT_DATA5	?	PICA_REG_PROCTEX_LUT_DATA5
00B6	GPUREG_PROCTEX_LUT_DATA6	?	PICA_REG_PROCTEX_LUT_DATA6
00B7	GPUREG_PROCTEX_LUT_DATA7	?	PICA_REG_PROCTEX_LUT_DATA7
00B8	GPUREG_00B8
00B9	GPUREG_00B9
00BA	GPUREG_00BA
00BB	GPUREG_00BB
00BC	GPUREG_00BC
00BD	GPUREG_00BD
00BE	GPUREG_00BE
00BF	GPUREG_00BF
00C0	GPUREG_TEXENV0_SOURCE		PICA_REG_TEX_ENV_0
00C1	GPUREG_TEXENV0_OPERAND		PICA_REG_TEX_ENV_0_OPERAND
00C2	GPUREG_TEXENV0_COMBINER		PICA_REG_TEX_ENV_0_COMBINE
00C3	GPUREG_TEXENV0_COLOR		PICA_REG_TEX_ENV_0_COLOR
00C4	GPUREG_TEXENV0_SCALE		PICA_REG_TEX_ENV_0_SCALE
00C5	GPUREG_00C5
00C6	GPUREG_00C6
00C7	GPUREG_00C7
00C8	GPUREG_TEXENV1_SOURCE		PICA_REG_TEX_ENV_1
00C9	GPUREG_TEXENV1_OPERAND		PICA_REG_TEX_ENV_1_OPERAND
00CA	GPUREG_TEXENV1_COMBINER		PICA_REG_TEX_ENV_1_COMBINE
00CB	GPUREG_TEXENV1_COLOR		PICA_REG_TEX_ENV_1_COLOR
00CC	GPUREG_TEXENV1_SCALE		PICA_REG_TEX_ENV_1_SCALE
00CD	GPUREG_00CD
00CE	GPUREG_00CE
00CF	GPUREG_00CF
00D0	GPUREG_TEXENV2_SOURCE		PICA_REG_TEX_ENV_2
00D1	GPUREG_TEXENV2_OPERAND		PICA_REG_TEX_ENV_2_OPERAND
00D2	GPUREG_TEXENV2_COMBINER		PICA_REG_TEX_ENV_2_COMBINE
00D3	GPUREG_TEXENV2_COLOR		PICA_REG_TEX_ENV_2_COLOR
00D4	GPUREG_TEXENV2_SCALE		PICA_REG_TEX_ENV_2_SCALE
00D5	GPUREG_00D5
00D6	GPUREG_00D6
00D7	GPUREG_00D7
00D8	GPUREG_TEXENV3_SOURCE		PICA_REG_TEX_ENV_3
00D9	GPUREG_TEXENV3_OPERAND		PICA_REG_TEX_ENV_3_OPERAND
00DA	GPUREG_TEXENV3_COMBINER		PICA_REG_TEX_ENV_3_COMBINE
00DB	GPUREG_TEXENV3_COLOR		PICA_REG_TEX_ENV_3_COLOR
00DC	GPUREG_TEXENV3_SCALE		PICA_REG_TEX_ENV_3_SCALE
00DD	GPUREG_00DD
00DE	GPUREG_00DE
00DF	GPUREG_00DF
00E0	GPUREG_TEXENV_UPDATE_BUFFER	?	PICA_REG_GAS_FOG_MODE / PICA_REG_TEX_ENV_BUF_INPUT
00E1	GPUREG_FOG_COLOR	?	PICA_REG_FOG_COLOR
00E2	GPUREG_00E2
00E3	GPUREG_00E3
00E4	GPUREG_GAS_ATTENUATION	?	PICA_REG_GAS_ATTENUATION
00E5	GPUREG_GAS_ACCMAX	?	PICA_REG_GAS_ACCMAX
00E6	GPUREG_FOG_LUT_INDEX	?	PICA_REG_FOG_LUT_INDEX
00E7	GPUREG_00E7
00E8	GPUREG_FOG_LUT_DATA0	?	PICA_REG_FOG_LUT_DATA0
00E9	GPUREG_FOG_LUT_DATA1	?	PICA_REG_FOG_LUT_DATA1
00EA	GPUREG_FOG_LUT_DATA2	?	PICA_REG_FOG_LUT_DATA2
00EB	GPUREG_FOG_LUT_DATA3	?	PICA_REG_FOG_LUT_DATA3
00EC	GPUREG_FOG_LUT_DATA4	?	PICA_REG_FOG_LUT_DATA4
00ED	GPUREG_FOG_LUT_DATA5	?	PICA_REG_FOG_LUT_DATA5
00EE	GPUREG_FOG_LUT_DATA6	?	PICA_REG_FOG_LUT_DATA6
00EF	GPUREG_FOG_LUT_DATA7	?	PICA_REG_FOG_LUT_DATA7
00F0	GPUREG_TEXENV4_SOURCE		PICA_REG_TEX_ENV_4
00F1	GPUREG_TEXENV4_OPERAND		PICA_REG_TEX_ENV_4_OPERAND
00F2	GPUREG_TEXENV4_COMBINER		PICA_REG_TEX_ENV_4_COMBINE
00F3	GPUREG_TEXENV4_COLOR		PICA_REG_TEX_ENV_4_COLOR
00F4	GPUREG_TEXENV4_SCALE		PICA_REG_TEX_ENV_4_SCALE
00F5	GPUREG_00F5
00F6	GPUREG_00F6
00F7	GPUREG_00F7
00F8	GPUREG_TEXENV5_SOURCE		PICA_REG_TEX_ENV_5
00F9	GPUREG_TEXENV5_OPERAND		PICA_REG_TEX_ENV_5_OPERAND
00FA	GPUREG_TEXENV5_COMBINER		PICA_REG_TEX_ENV_5_COMBINE
00FB	GPUREG_TEXENV5_COLOR		PICA_REG_TEX_ENV_5_COLOR
00FC	GPUREG_TEXENV5_SCALE		PICA_REG_TEX_ENV_5_SCALE
00FD	GPUREG_TEXENV_BUFFER_COLOR	?	PICA_REG_TEX_ENV_BUF_COLOR
00FE	GPUREG_00FE
00FF	GPUREG_00FF

Framebuffer registers (0x100-0x13F)

Register ID	Register name	Notes	Official Name
0100	GPUREG_COLOR_OPERATION		PICA_REG_COLOR_OPERATION
0101	GPUREG_BLEND_FUNC		PICA_REG_BLEND_FUNC
0102	GPUREG_LOGIC_OP		PICA_REG_LOGIC_OP
0103	GPUREG_BLEND_COLOR		PICA_REG_BLEND_COLOR
0104	GPUREG_FRAGOP_ALPHA_TEST		PICA_REG_FRAGOP_ALPHA_TEST
0105	GPUREG_STENCIL_TEST		PICA_REG_STENCIL_TEST
0106	GPUREG_STENCIL_OP		PICA_REG_STENCIL_OP
0107	GPUREG_DEPTH_COLOR_MASK		PICA_REG_DEPTH_COLOR_MASK
0108	GPUREG_0108
0109	GPUREG_0109
010A	GPUREG_010A
010B	GPUREG_010B
010C	GPUREG_010C
010D	GPUREG_010D
010E	GPUREG_010E
010F	GPUREG_010F
0110	GPUREG_FRAMEBUFFER_INVALIDATE		PICA_REG_COLOR_BUFFER_CLEAR0
0111	GPUREG_FRAMEBUFFER_FLUSH		PICA_REG_COLOR_BUFFER_CLEAR1
0112	GPUREG_COLORBUFFER_READ		PICA_REG_COLOR_BUFFER_READ
0113	GPUREG_COLORBUFFER_WRITE		PICA_REG_COLOR_BUFFER_WRITE
0114	GPUREG_DEPTHBUFFER_READ		PICA_REG_DEPTH_STENCIL_READ
0115	GPUREG_DEPTHBUFFER_WRITE		PICA_REG_DEPTH_STENCIL_WRITE
0116	GPUREG_DEPTHBUFFER_FORMAT		PICA_REG_RENDER_BUF_DEPTH_MODE
0117	GPUREG_COLORBUFFER_FORMAT		PICA_REG_RENDER_BUF_COLOR_MODE
0118	GPUREG_EARLYDEPTH_TEST2	?	PICA_REG_EARLY_DEPTH_TEST2
0119	GPUREG_0119
011A	GPUREG_011A
011B	GPUREG_FRAMEBUFFER_BLOCK32		PICA_REG_RENDER_BLOCK_FORMAT
011C	GPUREG_DEPTHBUFFER_LOC		PICA_REG_RENDER_BUF_DEPTH_ADDR
011D	GPUREG_COLORBUFFER_LOC		PICA_REG_RENDER_BUF_COLOR_ADDR
011E	GPUREG_FRAMEBUFFER_DIM		PICA_REG_RENDER_BUF_RESOLUTION0
011F	GPUREG_011F
0120	GPUREG_GAS_LIGHT_XY	?	PICA_REG_GAS_LIGHT_XY
0121	GPUREG_GAS_LIGHT_Z	?	PICA_REG_GAS_LIGHT_Z
0122	GPUREG_GAS_LIGHT_Z_COLOR	?	PICA_REG_GAS_LIGHT_Z_COLOR
0123	GPUREG_GAS_LUT_INDEX	?	PICA_REG_GAS_LUT_INDEX
0124	GPUREG_GAS_LUT_DATA	?	PICA_REG_GAS_LUT_DATA
0125	GPUREG_0125
0126	GPUREG_GAS_DELTAZ_DEPTH	?	PICA_REG_GAS_DELTAZ_DEPTH
0127	GPUREG_0127
0128	GPUREG_0128
0129	GPUREG_0129
012A	GPUREG_012A
012B	GPUREG_012B
012C	GPUREG_012C
012D	GPUREG_012D
012E	GPUREG_012E
012F	GPUREG_012F
0130	GPUREG_FRAGOP_SHADOW	?	PICA_REG_FRAGOP_SHADOW
0131	GPUREG_0131
0132	GPUREG_0132
0133	GPUREG_0133
0134	GPUREG_0134
0135	GPUREG_0135
0136	GPUREG_0136
0137	GPUREG_0137
0138	GPUREG_0138
0139	GPUREG_0139
013A	GPUREG_013A
013B	GPUREG_013B
013C	GPUREG_013C
013D	GPUREG_013D
013E	GPUREG_013E
013F	GPUREG_013F

Fragment lighting registers (0x140-0x1FF)

Register ID	Register name	Notes	Official Name
0140	GPUREG_LIGHT0_SPECULAR0	?	PICA_REG_FRAG_LIGHT0_SPECULAR0 / PICA_REG_FRAG_LIGHT_START
0141	GPUREG_LIGHT0_SPECULAR1	?	PICA_REG_FRAG_LIGHT0_SPECULAR1
0142	GPUREG_LIGHT0_DIFFUSE	?	PICA_REG_FRAG_LIGHT0_DIFFUSE
0143	GPUREG_LIGHT0_AMBIENT	?	PICA_REG_FRAG_LIGHT0_AMBIENT
0144	GPUREG_LIGHT0_XY	?	PICA_REG_FRAG_LIGHT0_POSITION_XY
0145	GPUREG_LIGHT0_Z	?	PICA_REG_FRAG_LIGHT0_POSITION_Z
0146	GPUREG_LIGHT0_SPOTDIR_XY	?	PICA_REG_FRAG_LIGHT0_SPOT_XY
0147	GPUREG_LIGHT0_SPOTDIR_Z	?	PICA_REG_FRAG_LIGHT0_SPOT_Z
0148	GPUREG_0148
0149	GPUREG_LIGHT0_CONFIG		PICA_REG_FRAG_LIGHT0_TYPE
014A	GPUREG_LIGHT0_ATTENUATION_BIAS	?	PICA_REG_FRAG_LIGHT0_DIST_ATTN_BIAS
014B	GPUREG_LIGHT0_ATTENUATION_SCALE	?	PICA_REG_FRAG_LIGHT0_DIST_ATTN_SCALE
014C	GPUREG_014C
014D	GPUREG_014D
014E	GPUREG_014E
014F	GPUREG_014F
0150	GPUREG_LIGHT1_SPECULAR0	?	PICA_REG_FRAG_LIGHT1_SPECULAR0
0151	GPUREG_LIGHT1_SPECULAR1	?	PICA_REG_FRAG_LIGHT1_SPECULAR1
0152	GPUREG_LIGHT1_DIFFUSE	?	PICA_REG_FRAG_LIGHT1_DIFFUSE
0153	GPUREG_LIGHT1_AMBIENT	?	PICA_REG_FRAG_LIGHT1_AMBIENT
0154	GPUREG_LIGHT1_XY	?	PICA_REG_FRAG_LIGHT1_POSITION_XY
0155	GPUREG_LIGHT1_Z	?	PICA_REG_FRAG_LIGHT1_POSITION_Z
0156	GPUREG_LIGHT1_SPOTDIR_XY	?	PICA_REG_FRAG_LIGHT1_SPOT_XY
0157	GPUREG_LIGHT1_SPOTDIR_Z	?	PICA_REG_FRAG_LIGHT1_SPOT_Z
0158	GPUREG_0158
0159	GPUREG_LIGHT1_CONFIG	?	PICA_REG_FRAG_LIGHT1_TYPE
015A	GPUREG_LIGHT1_ATTENUATION_BIAS	?	PICA_REG_FRAG_LIGHT1_DIST_ATTN_BIAS
015B	GPUREG_LIGHT1_ATTENUATION_SCALE	?	PICA_REG_FRAG_LIGHT1_DIST_ATTN_SCALE
015C	GPUREG_015C
015D	GPUREG_015D
015E	GPUREG_015E
015F	GPUREG_015F
0160	GPUREG_LIGHT2_SPECULAR0	?	PICA_REG_FRAG_LIGHT2_SPECULAR0
0161	GPUREG_LIGHT2_SPECULAR1	?	PICA_REG_FRAG_LIGHT2_SPECULAR1
0162	GPUREG_LIGHT2_DIFFUSE	?	PICA_REG_FRAG_LIGHT2_DIFFUSE
0163	GPUREG_LIGHT2_AMBIENT	?	PICA_REG_FRAG_LIGHT2_AMBIENT
0164	GPUREG_LIGHT2_XY	?	PICA_REG_FRAG_LIGHT2_POSITION_XY
0165	GPUREG_LIGHT2_Z	?	PICA_REG_FRAG_LIGHT2_POSITION_Z
0166	GPUREG_LIGHT2_SPOTDIR_XY	?	PICA_REG_FRAG_LIGHT2_SPOT_XY
0167	GPUREG_LIGHT2_SPOTDIR_Z	?	PICA_REG_FRAG_LIGHT2_SPOT_Z
0168	GPUREG_0168
0169	GPUREG_LIGHT2_CONFIG	?	PICA_REG_FRAG_LIGHT2_TYPE
016A	GPUREG_LIGHT2_ATTENUATION_BIAS	?	PICA_REG_FRAG_LIGHT2_DIST_ATTN_BIAS
016B	GPUREG_LIGHT2_ATTENUATION_SCALE	?	PICA_REG_FRAG_LIGHT2_DIST_ATTN_SCALE
016C	GPUREG_016C
016D	GPUREG_016D
016E	GPUREG_016E
016F	GPUREG_016F
0170	GPUREG_LIGHT3_SPECULAR0	?	PICA_REG_FRAG_LIGHT3_SPECULAR0
0171	GPUREG_LIGHT3_SPECULAR1	?	PICA_REG_FRAG_LIGHT3_SPECULAR1
0172	GPUREG_LIGHT3_DIFFUSE	?	PICA_REG_FRAG_LIGHT3_DIFFUSE
0173	GPUREG_LIGHT3_AMBIENT	?	PICA_REG_FRAG_LIGHT3_AMBIENT
0174	GPUREG_LIGHT3_XY	?	PICA_REG_FRAG_LIGHT3_POSITION_XY
0175	GPUREG_LIGHT3_Z	?	PICA_REG_FRAG_LIGHT3_POSITION_Z
0176	GPUREG_LIGHT3_SPOTDIR_XY	?	PICA_REG_FRAG_LIGHT3_SPOT_XY
0177	GPUREG_LIGHT3_SPOTDIR_Z	?	PICA_REG_FRAG_LIGHT3_SPOT_Z
0178	GPUREG_0178
0179	GPUREG_LIGHT3_CONFIG	?	PICA_REG_FRAG_LIGHT3_TYPE
017A	GPUREG_LIGHT3_ATTENUATION_BIAS	?	PICA_REG_FRAG_LIGHT3_DIST_ATTN_BIAS
017B	GPUREG_LIGHT3_ATTENUATION_SCALE	?	PICA_REG_FRAG_LIGHT3_DIST_ATTN_SCALE
017C	GPUREG_017C
017D	GPUREG_017D
017E	GPUREG_017E
017F	GPUREG_017F
0180	GPUREG_LIGHT4_SPECULAR0	?	PICA_REG_FRAG_LIGHT4_SPECULAR0
0181	GPUREG_LIGHT4_SPECULAR1	?	PICA_REG_FRAG_LIGHT4_SPECULAR1
0182	GPUREG_LIGHT4_DIFFUSE	?	PICA_REG_FRAG_LIGHT4_DIFFUSE
0183	GPUREG_LIGHT4_AMBIENT	?	PICA_REG_FRAG_LIGHT4_AMBIENT
0184	GPUREG_LIGHT4_XY	?	PICA_REG_FRAG_LIGHT4_POSITION_XY
0185	GPUREG_LIGHT4_Z	?	PICA_REG_FRAG_LIGHT4_POSITION_Z
0186	GPUREG_LIGHT4_SPOTDIR_XY	?	PICA_REG_FRAG_LIGHT4_SPOT_XY
0187	GPUREG_LIGHT4_SPOTDIR_Z	?	PICA_REG_FRAG_LIGHT4_SPOT_Z
0188	GPUREG_0188
0189	GPUREG_LIGHT4_CONFIG	?	PICA_REG_FRAG_LIGHT4_TYPE
018A	GPUREG_LIGHT4_ATTENUATION_BIAS	?	PICA_REG_FRAG_LIGHT4_DIST_ATTN_BIAS
018B	GPUREG_LIGHT4_ATTENUATION_SCALE	?	PICA_REG_FRAG_LIGHT4_DIST_ATTN_SCALE
018C	GPUREG_018C
018D	GPUREG_018D
018E	GPUREG_018E
018F	GPUREG_018F
0190	GPUREG_LIGHT5_SPECULAR0	?	PICA_REG_FRAG_LIGHT5_SPECULAR0
0191	GPUREG_LIGHT5_SPECULAR1	?	PICA_REG_FRAG_LIGHT5_SPECULAR1
0192	GPUREG_LIGHT5_DIFFUSE	?	PICA_REG_FRAG_LIGHT5_DIFFUSE
0193	GPUREG_LIGHT5_AMBIENT	?	PICA_REG_FRAG_LIGHT5_AMBIENT
0194	GPUREG_LIGHT5_XY	?	PICA_REG_FRAG_LIGHT5_POSITION_XY
0195	GPUREG_LIGHT5_Z	?	PICA_REG_FRAG_LIGHT5_POSITION_Z
0196	GPUREG_LIGHT5_SPOTDIR_XY	?	PICA_REG_FRAG_LIGHT5_SPOT_XY
0197	GPUREG_LIGHT5_SPOTDIR_Z	?	PICA_REG_FRAG_LIGHT5_SPOT_Z
0198	GPUREG_0198
0199	GPUREG_LIGHT5_CONFIG	?	PICA_REG_FRAG_LIGHT5_TYPE
019A	GPUREG_LIGHT5_ATTENUATION_BIAS		PICA_REG_FRAG_LIGHT5_DIST_ATTN_BIAS
019B	GPUREG_LIGHT5_ATTENUATION_SCALE		PICA_REG_FRAG_LIGHT5_DIST_ATTN_SCALE
019C	GPUREG_019C
019D	GPUREG_019D
019E	GPUREG_019E
019F	GPUREG_019F
01A0	GPUREG_LIGHT6_SPECULAR0	?	PICA_REG_FRAG_LIGHT6_SPECULAR0
01A1	GPUREG_LIGHT6_SPECULAR1	?	PICA_REG_FRAG_LIGHT6_SPECULAR1
01A2	GPUREG_LIGHT6_DIFFUSE		PICA_REG_FRAG_LIGHT6_DIFFUSE
01A3	GPUREG_LIGHT6_AMBIENT		PICA_REG_FRAG_LIGHT6_AMBIENT
01A4	GPUREG_LIGHT6_XY		PICA_REG_FRAG_LIGHT6_POSITION_XY
01A5	GPUREG_LIGHT6_Z		PICA_REG_FRAG_LIGHT6_POSITION_Z
01A6	GPUREG_LIGHT6_SPOTDIR_XY	?	PICA_REG_FRAG_LIGHT6_SPOT_XY
01A7	GPUREG_LIGHT6_SPOTDIR_Z	?	PICA_REG_FRAG_LIGHT6_SPOT_Z
01A8	GPUREG_01A8
01A9	GPUREG_LIGHT6_CONFIG	?	PICA_REG_FRAG_LIGHT6_TYPE
01AA	GPUREG_LIGHT6_ATTENUATION_BIAS		PICA_REG_FRAG_LIGHT6_DIST_ATTN_BIAS
01AB	GPUREG_LIGHT6_ATTENUATION_SCALE		PICA_REG_FRAG_LIGHT6_DIST_ATTN_SCALE
01AC	GPUREG_01AC
01AD	GPUREG_01AD
01AE	GPUREG_01AE
01AF	GPUREG_01AF
01B0	GPUREG_LIGHT7_SPECULAR0	?	PICA_REG_FRAG_LIGHT7_SPECULAR0
01B1	GPUREG_LIGHT7_SPECULAR1	?	PICA_REG_FRAG_LIGHT7_SPECULAR1
01B2	GPUREG_LIGHT7_DIFFUSE	?	PICA_REG_FRAG_LIGHT7_DIFFUSE
01B3	GPUREG_LIGHT7_AMBIENT	?	PICA_REG_FRAG_LIGHT7_AMBIENT
01B4	GPUREG_LIGHT7_XY	?	PICA_REG_FRAG_LIGHT7_POSITION_XY
01B5	GPUREG_LIGHT7_Z	?	PICA_REG_FRAG_LIGHT7_POSITION_Z
01B6	GPUREG_LIGHT7_SPOTDIR_XY	?	PICA_REG_FRAG_LIGHT7_SPOT_XY
01B7	GPUREG_LIGHT7_SPOTDIR_Z	?	PICA_REG_FRAG_LIGHT7_SPOT_Z
01B8	GPUREG_01B8
01B9	GPUREG_LIGHT7_CONFIG	?	PICA_REG_FRAG_LIGHT7_TYPE
01BA	GPUREG_LIGHT7_ATTENUATION_BIAS		PICA_REG_FRAG_LIGHT7_DIST_ATTN_BIAS
01BB	GPUREG_LIGHT7_ATTENUATION_SCALE		PICA_REG_FRAG_LIGHT7_DIST_ATTN_SCALE
01BC	GPUREG_01BC
01BD	GPUREG_01BD
01BE	GPUREG_01BE
01BF	GPUREG_01BF
01C0	GPUREG_LIGHTING_AMBIENT	?	PICA_REG_FRAG_LIGHT_AMBIENT
01C1	GPUREG_01C1
01C2	GPUREG_LIGHTING_NUM_LIGHTS	?	PICA_REG_FRAG_LIGHT_SRC_NUM
01C3	GPUREG_LIGHTING_CONFIG0	?	PICA_REG_FRAG_LIGHT_FUNC_MODE0
01C4	GPUREG_LIGHTING_CONFIG1	?	PICA_REG_FRAG_LIGHT_FUNC_MODE1
01C5	GPUREG_LIGHTING_LUT_INDEX	?	PICA_REG_FRAG_LIGHT_LUT
01C6	GPUREG_LIGHTING_ENABLE1	?	PICA_REG_FRAG_LIGHT_EN1
01C7	GPUREG_01C7
01C8	GPUREG_LIGHTING_LUT_DATA0	?	PICA_REG_FRAG_LIGHT_LUT_DATA0
01C9	GPUREG_LIGHTING_LUT_DATA1	?	PICA_REG_FRAG_LIGHT_LUT_DATA1
01CA	GPUREG_LIGHTING_LUT_DATA2	?	PICA_REG_FRAG_LIGHT_LUT_DATA2
01CB	GPUREG_LIGHTING_LUT_DATA3	?	PICA_REG_FRAG_LIGHT_LUT_DATA3
01CC	GPUREG_LIGHTING_LUT_DATA4	?	PICA_REG_FRAG_LIGHT_LUT_DATA4
01CD	GPUREG_LIGHTING_LUT_DATA5	?	PICA_REG_FRAG_LIGHT_LUT_DATA5
01CE	GPUREG_LIGHTING_LUT_DATA6	?	PICA_REG_FRAG_LIGHT_LUT_DATA6
01CF	GPUREG_LIGHTING_LUT_DATA7	?	PICA_REG_FRAG_LIGHT_LUT_DATA7
01D0	GPUREG_LIGHTING_LUTINPUT_ABS	?	PICA_REG_FRAG_LIGHT_ABSLUTINPUT
01D1	GPUREG_LIGHTING_LUTINPUT_SELECT	?	PICA_REG_FRAG_LIGHT_LUTINPUT
01D2	GPUREG_LIGHTING_LUTINPUT_SCALE	?	PICA_REG_FRAG_LIGHT_LUTSCALE
01D3	GPUREG_01D3
01D4	GPUREG_01D4
01D5	GPUREG_01D5
01D6	GPUREG_01D6
01D7	GPUREG_01D7
01D8	GPUREG_01D8
01D9	GPUREG_LIGHTING_LIGHT_PERMUTATION	?	PICA_REG_FRAG_LIGHT_SRC_EN_ID
01DA	GPUREG_01DA
01DB	GPUREG_01DB
01DC	GPUREG_01DC
01DD	GPUREG_01DD
01DE	GPUREG_01DE
01DF	GPUREG_01DF
01E0	GPUREG_01E0
01E1	GPUREG_01E1
01E2	GPUREG_01E2
01E3	GPUREG_01E3
01E4	GPUREG_01E4
01E5	GPUREG_01E5
01E6	GPUREG_01E6
01E7	GPUREG_01E7
01E8	GPUREG_01E8
01E9	GPUREG_01E9
01EA	GPUREG_01EA
01EB	GPUREG_01EB
01EC	GPUREG_01EC
01ED	GPUREG_01ED
01EE	GPUREG_01EE
01EF	GPUREG_01EF
01F0	GPUREG_01F0
01F1	GPUREG_01F1
01F2	GPUREG_01F2
01F3	GPUREG_01F3
01F4	GPUREG_01F4
01F5	GPUREG_01F5
01F6	GPUREG_01F6
01F7	GPUREG_01F7
01F8	GPUREG_01F8
01F9	GPUREG_01F9
01FA	GPUREG_01FA
01FB	GPUREG_01FB
01FC	GPUREG_01FC
01FD	GPUREG_01FD
01FE	GPUREG_01FE
01FF	GPUREG_01FF

Geometry pipeline registers (0x200-0x27F)

Register ID	Register name	Notes	Official Name
0200	GPUREG_ATTRIBBUFFERS_LOC		PICA_REG_VTX_ATTR_ARRAYS_BASE_ADDR
0201	GPUREG_ATTRIBBUFFERS_FORMAT_LOW		PICA_REG_VTX_ATTR_ARRAYS0
0202	GPUREG_ATTRIBBUFFERS_FORMAT_HIGH		PICA_REG_VTX_ATTR_ARRAYS1
0203	GPUREG_ATTRIBBUFFER0_OFFSET		PICA_REG_LOAD_ARRAY0_ATTR_OFFSET
0204	GPUREG_ATTRIBBUFFER0_CONFIG1		PICA_REG_LOAD_ARRAY0_ELEMENT0
0205	GPUREG_ATTRIBBUFFER0_CONFIG2		PICA_REG_LOAD_ARRAY0_ELEMENT1
0206	GPUREG_ATTRIBBUFFER1_OFFSET
0207	GPUREG_ATTRIBBUFFER1_CONFIG1
0208	GPUREG_ATTRIBBUFFER1_CONFIG2
0209	GPUREG_ATTRIBBUFFER2_OFFSET
020A	GPUREG_ATTRIBBUFFER2_CONFIG1
020B	GPUREG_ATTRIBBUFFER2_CONFIG2
020C	GPUREG_ATTRIBBUFFER3_OFFSET
020D	GPUREG_ATTRIBBUFFER3_CONFIG1
020E	GPUREG_ATTRIBBUFFER3_CONFIG2
020F	GPUREG_ATTRIBBUFFER4_OFFSET
0210	GPUREG_ATTRIBBUFFER4_CONFIG1
0211	GPUREG_ATTRIBBUFFER4_CONFIG2
0212	GPUREG_ATTRIBBUFFER5_OFFSET
0213	GPUREG_ATTRIBBUFFER5_CONFIG1
0214	GPUREG_ATTRIBBUFFER5_CONFIG2
0215	GPUREG_ATTRIBBUFFER6_OFFSET
0216	GPUREG_ATTRIBBUFFER6_CONFIG1
0217	GPUREG_ATTRIBBUFFER6_CONFIG2
0218	GPUREG_ATTRIBBUFFER7_OFFSET
0219	GPUREG_ATTRIBBUFFER7_CONFIG1
021A	GPUREG_ATTRIBBUFFER7_CONFIG2
021B	GPUREG_ATTRIBBUFFER8_OFFSET
021C	GPUREG_ATTRIBBUFFER8_CONFIG1
021D	GPUREG_ATTRIBBUFFER8_CONFIG2
021E	GPUREG_ATTRIBBUFFER9_OFFSET
021F	GPUREG_ATTRIBBUFFER9_CONFIG1
0220	GPUREG_ATTRIBBUFFER9_CONFIG2
0221	GPUREG_ATTRIBBUFFER10_OFFSET
0222	GPUREG_ATTRIBBUFFER10_CONFIG1
0223	GPUREG_ATTRIBBUFFER10_CONFIG2
0224	GPUREG_ATTRIBBUFFER11_OFFSET
0225	GPUREG_ATTRIBBUFFER11_CONFIG1
0226	GPUREG_ATTRIBBUFFER11_CONFIG2
0227	GPUREG_INDEXBUFFER_CONFIG		PICA_REG_INDEX_ARRAY_ADDR_OFFSET
0228	GPUREG_NUMVERTICES		PICA_REG_DRAW_VERTEX_NUM
0229	GPUREG_GEOSTAGE_CONFIG	?	PICA_REG_DRAW_MODE0
022A	GPUREG_VERTEX_OFFSET		PICA_REG_DRAW_VERTEX_OFFSET
022B	GPUREG_022B
022C	GPUREG_022C
022D	GPUREG_POST_VERTEX_CACHE_NUM		PICA_REG_POST_VERTEX_CACHE_NUM
022E	GPUREG_DRAWARRAYS		PICA_REG_START_DRAW_ARRAY
022F	GPUREG_DRAWELEMENTS		PICA_REG_START_DRAW_ELEMENT
0230	GPUREG_0230
0231	GPUREG_VTX_FUNC	?	PICA_REG_VTX_FUNC
0232	GPUREG_FIXEDATTRIB_INDEX	?	PICA_REG_VS_FIXED_ATTR
0233	GPUREG_FIXEDATTRIB_DATA0	?	PICA_REG_VS_FIXED_ATTR_DATA0
0234	GPUREG_FIXEDATTRIB_DATA1	?	PICA_REG_VS_FIXED_ATTR_DATA1
0235	GPUREG_FIXEDATTRIB_DATA2	?	PICA_REG_VS_FIXED_ATTR_DATA2
0236	GPUREG_0236
0237	GPUREG_0237
0238	GPUREG_CMDBUF_SIZE0		PICA_REG_COMMAND_BUF_SIZE_CH0
0239	GPUREG_CMDBUF_SIZE1		PICA_REG_COMMAND_BUF_SIZE_CH1
023A	GPUREG_CMDBUF_ADDR0		PICA_REG_COMMAND_BUF_ADDR_CH0
023B	GPUREG_CMDBUF_ADDR1		PICA_REG_COMMAND_BUF_ADDR_CH1
023C	GPUREG_CMDBUF_JUMP0		PICA_REG_COMMAND_BUF_KICK_CH0
023D	GPUREG_CMDBUF_JUMP1		PICA_REG_COMMAND_BUF_KICK_CH1
023E	GPUREG_023E
023F	GPUREG_023F
0240	GPUREG_0240
0241	GPUREG_0241
0242	GPUREG_VSH_NUM_ATTR	?	PICA_REG_VS_ATTR_NUM1
0243	GPUREG_0243
0244	GPUREG_VSH_COM_MODE	?	PICA_REG_VS_COM_MODE
0245	GPUREG_START_DRAW_FUNC0	?	PICA_REG_START_DRAW_FUNC0
0246	GPUREG_0246
0247	GPUREG_0247
0248	GPUREG_0248
0249	GPUREG_0249
024A	GPUREG_VSH_OUTMAP_TOTAL1	?	PICA_REG_VS_OUT_REG_NUM1
024B	GPUREG_024B
024C	GPUREG_024C
024D	GPUREG_024D
024E	GPUREG_024E
024F	GPUREG_024F
0250	GPUREG_0250
0251	GPUREG_VSH_OUTMAP_TOTAL2	?	PICA_REG_VS_OUT_REG_NUM2
0252	GPUREG_GSH_MISC0	?	PICA_REG_GS_MISC_REG0
0253	GPUREG_GEOSTAGE_CONFIG2	?	PICA_REG_DRAW_MODE1
0254	GPUREG_GSH_MISC1	?	PICA_REG_GS_MISC_REG1
0255	GPUREG_0255
0256	GPUREG_0256
0257	GPUREG_0257
0258	GPUREG_0258
0259	GPUREG_0259
025A	GPUREG_025A
025B	GPUREG_025B
025C	GPUREG_025C
025D	GPUREG_025D
025E	GPUREG_PRIMITIVE_CONFIG	?	PICA_REG_GS_OUT_REG_NUM3 / PICA_REG_DRAW_MODE2 / PICA_REG_VS_OUT_REG_NUM3
025F	GPUREG_RESTART_PRIMITIVE	?	PICA_REG_START_DRAW_FUNC1
0260	GPUREG_0260
0261	GPUREG_0261
0262	GPUREG_0262
0263	GPUREG_0263
0264	GPUREG_0264
0265	GPUREG_0265
0266	GPUREG_0266
0267	GPUREG_0267
0268	GPUREG_0268
0269	GPUREG_0269
026A	GPUREG_026A
026B	GPUREG_026B
026C	GPUREG_026C
026D	GPUREG_026D
026E	GPUREG_026E
026F	GPUREG_026F
0270	GPUREG_0270
0271	GPUREG_0271
0272	GPUREG_0272
0273	GPUREG_0273
0274	GPUREG_0274
0275	GPUREG_0275
0276	GPUREG_0276
0277	GPUREG_0277
0278	GPUREG_0278
0279	GPUREG_0279
027A	GPUREG_027A
027B	GPUREG_027B
027C	GPUREG_027C
027D	GPUREG_027D
027E	GPUREG_027E
027F	GPUREG_027F

Shader registers (0x280-0x2DF)

Register ID	Register name	Notes	Official Name
Geometry shader
0280	GPUREG_GSH_BOOLUNIFORM		PICA_REG_GS_BOOL
0281	GPUREG_GSH_INTUNIFORM_I0		PICA_REG_GS_INT0
0282	GPUREG_GSH_INTUNIFORM_I1		PICA_REG_GS_INT1
0283	GPUREG_GSH_INTUNIFORM_I2		PICA_REG_GS_INT2
0284	GPUREG_GSH_INTUNIFORM_I3		PICA_REG_GS_INT3
0285	GPUREG_0285
0286	GPUREG_0286
0287	GPUREG_0287
0288	GPUREG_0288
0289	GPUREG_GSH_INPUTBUFFER_CONFIG		PICA_REG_GS_ATTR_NUM
028A	GPUREG_GSH_ENTRYPOINT		PICA_REG_GS_START_ADDR
028B	GPUREG_GSH_ATTRIBUTES_PERMUTATION_LOW		PICA_REG_GS_ATTR_IN_REG_MAP0
028C	GPUREG_GSH_ATTRIBUTES_PERMUTATION_HIGH		PICA_REG_GS_ATTR_IN_REG_MAP1
028D	GPUREG_GSH_OUTMAP_MASK		PICA_REG_GS_OUT_REG_MASK
028E	GPUREG_028E
028F	GPUREG_GSH_CODETRANSFER_END		PICA_REG_GS_PROG_RENEWAL_END
0290	GPUREG_GSH_FLOATUNIFORM_INDEX		PICA_REG_GS_FLOAT_ADDR
0291	GPUREG_GSH_FLOATUNIFORM_DATA0		PICA_REG_GS_FLOAT_DATA0
0292	GPUREG_GSH_FLOATUNIFORM_DATA1		PICA_REG_GS_FLOAT_DATA1
0293	GPUREG_GSH_FLOATUNIFORM_DATA2		PICA_REG_GS_FLOAT_DATA2
0294	GPUREG_GSH_FLOATUNIFORM_DATA3		PICA_REG_GS_FLOAT_DATA3
0295	GPUREG_GSH_FLOATUNIFORM_DATA4		PICA_REG_GS_FLOAT_DATA4
0296	GPUREG_GSH_FLOATUNIFORM_DATA5		PICA_REG_GS_FLOAT_DATA5
0297	GPUREG_GSH_FLOATUNIFORM_DATA6		PICA_REG_GS_FLOAT_DATA6
0298	GPUREG_GSH_FLOATUNIFORM_DATA7		PICA_REG_GS_FLOAT_DATA7
0299	GPUREG_0299
029A	GPUREG_029A
029B	GPUREG_GSH_CODETRANSFER_INDEX	?	PICA_REG_GS_PROG_ADDR
029C	GPUREG_GSH_CODETRANSFER_DATA0		PICA_REG_GS_PROG_DATA0
029D	GPUREG_GSH_CODETRANSFER_DATA1		PICA_REG_GS_PROG_DATA1
029E	GPUREG_GSH_CODETRANSFER_DATA2		PICA_REG_GS_PROG_DATA2
029F	GPUREG_GSH_CODETRANSFER_DATA3		PICA_REG_GS_PROG_DATA3
02A0	GPUREG_GSH_CODETRANSFER_DATA4		PICA_REG_GS_PROG_DATA4
02A1	GPUREG_GSH_CODETRANSFER_DATA5		PICA_REG_GS_PROG_DATA5
02A2	GPUREG_GSH_CODETRANSFER_DATA6		PICA_REG_GS_PROG_DATA6
02A3	GPUREG_GSH_CODETRANSFER_DATA7		PICA_REG_GS_PROG_DATA7
02A4	GPUREG_02A4
02A5	GPUREG_GSH_OPDESCS_INDEX		PICA_REG_GS_PROG_SWIZZLE_ADDR
02A6	GPUREG_GSH_OPDESCS_DATA0		PICA_REG_GS_PROG_SWIZZLE_DATA0
02A7	GPUREG_GSH_OPDESCS_DATA1		PICA_REG_GS_PROG_SWIZZLE_DATA1
02A8	GPUREG_GSH_OPDESCS_DATA2		PICA_REG_GS_PROG_SWIZZLE_DATA2
02A9	GPUREG_GSH_OPDESCS_DATA3		PICA_REG_GS_PROG_SWIZZLE_DATA3
02AA	GPUREG_GSH_OPDESCS_DATA4		PICA_REG_GS_PROG_SWIZZLE_DATA4
02AB	GPUREG_GSH_OPDESCS_DATA5		PICA_REG_GS_PROG_SWIZZLE_DATA5
02AC	GPUREG_GSH_OPDESCS_DATA6		PICA_REG_GS_PROG_SWIZZLE_DATA6
02AD	GPUREG_GSH_OPDESCS_DATA7		PICA_REG_GS_PROG_SWIZZLE_DATA7
02AE	GPUREG_02AE
02AF	GPUREG_02AF
Vertex shader
02B0	GPUREG_VSH_BOOLUNIFORM		PICA_REG_VS_BOOL
02B1	GPUREG_VSH_INTUNIFORM_I0		PICA_REG_VS_INT0
02B2	GPUREG_VSH_INTUNIFORM_I1		PICA_REG_VS_INT1
02B3	GPUREG_VSH_INTUNIFORM_I2		PICA_REG_VS_INT2
02B4	GPUREG_VSH_INTUNIFORM_I3		PICA_REG_VS_INT3
02B5	GPUREG_02B5
02B6	GPUREG_02B6
02B7	GPUREG_02B7
02B8	GPUREG_02B8
02B9	GPUREG_VSH_INPUTBUFFER_CONFIG		PICA_REG_VS_ATTR_NUM0
02BA	GPUREG_VSH_ENTRYPOINT		PICA_REG_VS_START_ADDR
02BB	GPUREG_VSH_ATTRIBUTES_PERMUTATION_LOW		PICA_REG_VS_ATTR_IN_REG_MAP0
02BC	GPUREG_VSH_ATTRIBUTES_PERMUTATION_HIGH		PICA_REG_VS_ATTR_IN_REG_MAP1
02BD	GPUREG_VSH_OUTMAP_MASK		PICA_REG_VS_OUT_REG_MASK
02BE	GPUREG_02BE
02BF	GPUREG_VSH_CODETRANSFER_END		PICA_REG_VS_PROG_RENEWAL_END
02C0	GPUREG_VSH_FLOATUNIFORM_INDEX		PICA_REG_VS_FLOAT_ADDR
02C1	GPUREG_VSH_FLOATUNIFORM_DATA0		PICA_REG_VS_FLOAT_DATA0
02C2	GPUREG_VSH_FLOATUNIFORM_DATA1		PICA_REG_VS_FLOAT_DATA1
02C3	GPUREG_VSH_FLOATUNIFORM_DATA2		PICA_REG_VS_FLOAT_DATA2
02C4	GPUREG_VSH_FLOATUNIFORM_DATA3		PICA_REG_VS_FLOAT_DATA3
02C5	GPUREG_VSH_FLOATUNIFORM_DATA4		PICA_REG_VS_FLOAT_DATA4
02C6	GPUREG_VSH_FLOATUNIFORM_DATA5		PICA_REG_VS_FLOAT_DATA5
02C7	GPUREG_VSH_FLOATUNIFORM_DATA6		PICA_REG_VS_FLOAT_DATA6
02C8	GPUREG_VSH_FLOATUNIFORM_DATA7		PICA_REG_VS_FLOAT_DATA7
02C9	GPUREG_02C9
02CA	GPUREG_02CA
02CB	GPUREG_VSH_CODETRANSFER_INDEX	?	PICA_REG_VS_PROG_ADDR
02CC	GPUREG_VSH_CODETRANSFER_DATA0		PICA_REG_VS_PROG_DATA0
02CD	GPUREG_VSH_CODETRANSFER_DATA1		PICA_REG_VS_PROG_DATA1
02CE	GPUREG_VSH_CODETRANSFER_DATA2		PICA_REG_VS_PROG_DATA2
02CF	GPUREG_VSH_CODETRANSFER_DATA3		PICA_REG_VS_PROG_DATA3
02D0	GPUREG_VSH_CODETRANSFER_DATA4		PICA_REG_VS_PROG_DATA4
02D1	GPUREG_VSH_CODETRANSFER_DATA5		PICA_REG_VS_PROG_DATA5
02D2	GPUREG_VSH_CODETRANSFER_DATA6		PICA_REG_VS_PROG_DATA6
02D3	GPUREG_VSH_CODETRANSFER_DATA7		PICA_REG_VS_PROG_DATA7
02D4	GPUREG_02D4
02D5	GPUREG_VSH_OPDESCS_INDEX	?	PICA_REG_VS_PROG_SWIZZLE_ADDR
02D6	GPUREG_VSH_OPDESCS_DATA0		PICA_REG_VS_PROG_SWIZZLE_DATA0
02D7	GPUREG_VSH_OPDESCS_DATA1		PICA_REG_VS_PROG_SWIZZLE_DATA1
02D8	GPUREG_VSH_OPDESCS_DATA2		PICA_REG_VS_PROG_SWIZZLE_DATA2
02D9	GPUREG_VSH_OPDESCS_DATA3		PICA_REG_VS_PROG_SWIZZLE_DATA3
02DA	GPUREG_VSH_OPDESCS_DATA4		PICA_REG_VS_PROG_SWIZZLE_DATA4
02DB	GPUREG_VSH_OPDESCS_DATA5		PICA_REG_VS_PROG_SWIZZLE_DATA5
02DC	GPUREG_VSH_OPDESCS_DATA6		PICA_REG_VS_PROG_SWIZZLE_DATA6
02DD	GPUREG_VSH_OPDESCS_DATA7		PICA_REG_VS_PROG_SWIZZLE_DATA7
02DE	GPUREG_02DE
02DF	GPUREG_02DF

Unknown registers (0x2E0-0x2FF)

Register ID	Register name	Notes	Official Name
02E0	GPUREG_02E0
02E1	GPUREG_02E1
02E2	GPUREG_02E2
02E3	GPUREG_02E3
02E4	GPUREG_02E4
02E5	GPUREG_02E5
02E6	GPUREG_02E6
02E7	GPUREG_02E7
02E8	GPUREG_02E8
02E9	GPUREG_02E9
02EA	GPUREG_02EA
02EB	GPUREG_02EB
02EC	GPUREG_02EC
02ED	GPUREG_02ED
02EE	GPUREG_02EE
02EF	GPUREG_02EF
02F0	GPUREG_02F0
02F1	GPUREG_02F1
02F2	GPUREG_02F2
02F3	GPUREG_02F3
02F4	GPUREG_02F4
02F5	GPUREG_02F5
02F6	GPUREG_02F6
02F7	GPUREG_02F7
02F8	GPUREG_02F8
02F9	GPUREG_02F9
02FA	GPUREG_02FA
02FB	GPUREG_02FB
02FC	GPUREG_02FC
02FD	GPUREG_02FD
02FE	GPUREG_02FE
02FF	GPUREG_02FF

Miscellaneous registers

GPUREG_FINALIZE

Bits	Description
0-31	unsigned, Trigger P3D Interrupt (0 = idle, non-zero = trigger)

Writing to this register seems to signal the GPU to stop processing GPU commands from the current buffer; any command following a write to this register will be ignored. The value written to this register does not appear to matter, although 0x12345678 is the value typically written by commercial software. Failure to write to this register in any command buffer will result in the GPU hanging.

Rasterizer registers

GPUREG_FACECULLING_CONFIG

Bits	Description
0-1	unsigned, Culling mode

This register is used to configure the face culling mode.

Culling mode values:

Value	Description
0	None
1	Front Face (Counter Clockwise)
2	Back Face (Counter Clockwise)

GPUREG_VIEWPORT_WIDTH

Bits	Description
0-23	float1.7.16, width / 2

This register is used to configure the viewport width, along with GPUREG_VIEWPORT_INVW.

GPUREG_VIEWPORT_INVW

Bits	Description
1-31	float1.7.23, 2 / width

This register is used to configure the viewport width, along with GPUREG_VIEWPORT_WIDTH.

GPUREG_VIEWPORT_HEIGHT

Bits	Description
0-23	float1.7.16, height / 2

This register is used to configure the viewport height, along with GPUREG_VIEWPORT_INVH.

GPUREG_VIEWPORT_INVH

Bits	Description
1-31	float1.7.23, 2 / height

This register is used to configure the viewport height, along with GPUREG_VIEWPORT_HEIGHT.

GPUREG_FRAGOP_CLIP

Bits	Description
0	unsigned, Enabled (0 = disabled, 1 = enabled)

This register is used to enable clipping planes.

GPUREG_FRAGOP_CLIP_DATAi

Bits	Description
0-23	float1.7.16, Clipping plane coefficient i

This register is used to configure clipping plane coefficients.

GPUREG_DEPTHMAP_SCALE

Bits	Description
0-23	float1.7.16, Near - Far

This register is used to configure the depth range scale.

GPUREG_DEPTHMAP_OFFSET

Bits	Description
0-23	float1.7.16, Near + Polygon Offset

This register is used to configure the depth range bias.

GPUREG_SH_OUTMAP_TOTAL

Bits	Description
0-2	unsigned, Number of following attributes

This register is used to configure the total shader output map attributes.

GPUREG_SH_OUTMAP_Oi

Bits	Description
0-4	unsigned, Semantic for the x component of the register.
8-12	unsigned, Semantic for the y component of the register.
16-20	unsigned, Semantic for the z component of the register.
24-28	unsigned, Semantic for the w component of the register.

These registers map components of the corresponding vertex shader output register to specific fixed-function semantics.

Semantic values:

Value	Semantic	Description
0x00	position.x	Vertex Position
0x01	position.y
0x02	position.z
0x03	position.w
0x04	normquat.x	Quaternion specifying the normal/tangent frame (for fragment lighting)
0x05	normquat.y
0x06	normquat.z
0x07	normquat.w
0x08	color.r	Vertex color
0x09	color.g
0x0A	color.b
0x0B	color.a
0x0C	texcoord0.u	Texture coordinates for texture 0
0x0D	texcoord0.v
0x0E	texcoord1.u	Texture coordinates for texture 1
0x0F	texcoord1.v
0x10	texcoord0.w
0x12	view.x	View vector (for fragment lighting)
0x13	view.y
0x14	view.z
0x16	texcoord2.u	Texture coordinates for texture 2
0x17	texcoord2.v
0x1F	Unused component	Should be set for unused components of the output register

GPUREG_EARLYDEPTH_FUNC

Bits	Description
0-1	unsigned, Early depth function

This register configures the early depth test function.

Early depth function values:

Value	Description
0	>=
1	>
2	<=
3	<

GPUREG_EARLYDEPTH_TEST1

Bits	Description
0	unsigned, Enabled (0 = disabled, 1 = enabled)

This register sets whether the early depth test is enabled.

GPUREG_EARLYDEPTH_CLEAR

Bits	Description
0	unsigned, Trigger (0 = idle, 1 = clear)

This register triggers clearing the early depth data.

GPUREG_SH_OUTATTR_MODE

Bits	Description
0	unsigned, Use texture coordinates (0 = don't use, 1 = use)

This register is used to configure the shader output attribute mode.

GPUREG_SCISSORTEST_MODE

Bits	Description
0-1	unsigned, Enabled (0 = disabled, 3 = enabled)

This register is used to enable scissor testing.

GPUREG_SCISSORTEST_POS

Bits	Description
0-9	unsigned, X1
16-25	unsigned, Y1

This register is used to configure the scissor test start position.

GPUREG_SCISSORTEST_DIM

Bits	Description
0-9	unsigned, X2
16-25	unsigned, Y2

This register is used to configure the scissor test end position.

GPUREG_VIEWPORT_XY

Bits	Description
0-9	signed, X
16-25	signed, Y

This register is used to configure the viewport position.

GPUREG_EARLYDEPTH_DATA

Bits	Description
0-23	unsigned, Clear value

This register is used to configure the early depth clear value.

GPUREG_DEPTHMAP_ENABLE

Bits	Description
0	unsigned, Enabled (0 = disabled, 1 = enabled)

This register is used to enable depth range.

GPUREG_RENDERBUF_DIM

Bits	Description
0-10	unsigned, Width
12-21	unsigned, Height - 1
24	0x1

This register is used to configure the output framebuffer dimensions.

GPUREG_SH_OUTATTR_CLOCK

Bits	Description
0	unsigned, 'position.z' present (0 = absent, 1 = present)
1	unsigned, 'color' component present (0 = absent, 1 = present)
8	unsigned, 'texcoord0' component present (0 = absent, 1 = present)
9	unsigned, 'texcoord1' component present (0 = absent, 1 = present)
10	unsigned, 'texcoord2' component present (0 = absent, 1 = present)
16	unsigned, 'texcoord0.w' present (0 = absent, 1 = present)
24	unsigned, 'normquat' or 'view' component present (0 = absent, 1 = present)

This register controls the clock supply to parts relating to certain attributes.

Texturing registers

GPUREG_TEXUNIT_CONFIG

Bits	Description
0	unsigned, Texture 0 enabled (0 = disabled, 1 = enabled)
1	unsigned, Texture 1 enabled (0 = disabled, 1 = enabled)
2	unsigned, Texture 2 enabled (0 = disabled, 1 = enabled)
3	0x0
8-9	unsigned, Texture 3 coordinates
10	unsigned, Texture 3 enabled (0 = disabled, 1 = enabled)
12	0x1
13	unsigned, Texture 2 coordinates
16	unsigned, Clear texture cache (0 = don't clear, 1 = clear)
17-31	0x0

This register is used to enable texture units.

Texture 3 coordinates values:

Value	Description
0	Texture 0
1	Texture 1
2	Texture 2

Texture 2 coordinates values:

Value	Description
0	Texture 2
1	Texture 1

GPUREG_TEXUNITi_BORDER_COLOR

Bits	Description
0-7	unsigned, Red
8-15	unsigned, Green
16-23	unsigned, Blue
24-31	unsigned, Alpha

This register is used to set a texture unit's border color.

GPUREG_TEXUNITi_DIM

Bits	Description
0-10	unsigned, Height
16-26	unsigned, Width

This register is used to set a texture unit's dimensions.

GPUREG_TEXUNITi_PARAM

Bits	Description
1	unsigned, Magnification filter
2	unsigned, Minification filter
4-5	unsigned, ETC1 (0 = not ETC1, 2 = ETC1) note: still 0 for ETC1A4
8-10	unsigned, Wrap T
12-14	unsigned, Wrap S
16-17	0x0
20	unsigned, Shadow (Texture 0 only, 0 = not shadow, 1 = shadow)
24	unsigned, Mipmap filter
28-30	unsigned, Type (Texture 0 only)

This register is used to set a texture unit's extra parameters.

Filter values:

Value	Description
0	Nearest
1	Linear

Wrap values:

Value	Description
0	Clamp to edge
1	Clamp to border
2	Repeat
3	Mirrored repeat

Type values:

Value	Description
0	2D
1	Cube map
2	Shadow 2D
3	Projection
4	Shadow cube
5	Disabled

GPUREG_TEXUNITi_LOD

Bits	Description
0-12	fixed1.4.8, Bias
16-19	unsigned, Max Level
24-27	unsigned, Min Level

This register is used to configure a texture unit's level of detail.

GPUREG_TEXUNITi_ADDRi

First ADDR register:

Bits	Description
0-27	unsigned, Texture physical address >> 3

Subsequent ADDR registers:

Bits	Description
0-21	unsigned, Texture physical address >> 3 (upper 6 bits reused from first ADDR register)

This register is used to set a texture unit's physical address(es) in memory. Individual texels in a texture are laid out in memory as a Z-order curve. Mipmap data is stored directly following the main texture data.

If the texture is a cube:

Register	Description
ADDR1	Positive X
ADDR2	Negative X
ADDR3	Positive Y
ADDR4	Negative Y
ADDR5	Positive Z
ADDR6	Negative Z

Otherwise, ADDR(1) points to a 2D texture, and the rest are empty.

GPUREG_TEXUNITi_SHADOW

Bits	Description
0	unsigned, Perspective (0 = perspective, 1 = not perspective)
1-23	fixed0.0.24, Z bias (upper 23 bits)

This register is used to set a texture unit's shadow texture properties.

GPUREG_TEXUNITi_TYPE

Bits	Description
0-3	unsigned, Format

This register is used to set a texture unit's data format.

Format values:

Value	Description	GL Format	GL Data Type
0x0	RGBA8888	GL_RGBA	GL_UNSIGNED_BYTE
0x1	RGB888	GL_RGB	GL_UNSIGNED_BYTE
0x2	RGBA5551	GL_RGBA	GL_UNSIGNED_SHORT_5_5_5_1
0x3	RGB565	GL_RGB	GL_UNSIGNED_SHORT_5_6_5
0x4	RGBA4444	GL_RGBA	GL_UNSIGNED_SHORT_4_4_4_4
0x5	IA8	GL_LUMINANCE_ALPHA	GL_UNSIGNED_BYTE
0x6	HILO8
0x7	I8	GL_LUMINANCE	GL_UNSIGNED_BYTE
0x8	A8	GL_ALPHA	GL_UNSIGNED_BYTE
0x9	IA44	GL_LUMINANCE_ALPHA	GL_UNSIGNED_BYTE_4_4_EXT
0xA	I4
0xB	A4	GL_ALPHA	GL_UNSIGNED_NIBBLE_EXT
0xC	ETC1	GL_ETC1_RGB8_OES
0xD	ETC1A4

GPUREG_LIGHTING_ENABLE0

Bits	Description
0	unsigned, Enabled (0 = disabled, 1 = enabled)

This register is used to enable lighting.

GPUREG_TEXUNIT3_PROCTEX0

Bits	Description
0-2	unsigned, U-direction clamp
3-5	unsigned, V-direction clamp
6-9	unsigned, RGB mapping function
10-13	unsigned, Alpha mapping function
14	unsigned, Handle alpha separately (0 = don't separate, 1 = separate)
15	unsigned, Noise enabled (0 = disabled, 1 = enabled)
16-17	unsigned, U-direction shift
18-19	unsigned, V-direction shift
20-27	float1.5.10, Texture bias (lower 8 bits)

This register is used to configure the procedural texture unit.

Clamp values:

Value	Description
0	Clamp to zero
1	Clamp to edge
2	Symmetrical repeat
3	Mirrored repeat
4	Pulse

Mapping function values:

Value	Description
0	U
1	U²
2	V
3	V²
4	(U + V) / 2
5	(U² + V²) / 2
6	sqrt(U² + V²)
7	Minimum
8	Maximum
9	Rmax

Shift values:

Value	Description
0	None
1	Odd
2	Even

GPUREG_TEXUNIT3_PROCTEX1

Bits	Description
0-15	fixed1.3.12, U-direction noise amplitude
16-31	float1.5.10, U-direction noise phase

This register is used to configure the procedural texture unit's U-direction noise amplitude/phase.

GPUREG_TEXUNIT3_PROCTEX2

Bits	Description
0-15	fixed1.3.12, V-direction noise amplitude
16-31	float1.5.10, V-direction noise phase

This register is used to configure the procedural texture unit's V-direction noise amplitude/phase.

GPUREG_TEXUNIT3_PROCTEX3

Bits	Description
0-15	float1.5.10, U-direction noise frequency
16-31	float1.5.10, V-direction noise frequency

This register is used to configure the procedural texture unit's U-direction and V-direction noise frequency.

GPUREG_TEXUNIT3_PROCTEX4

Bits	Description
0-2	unsigned, Minification filter
3-10	0x60
11-18	unsigned, Texture width
19-26	float1.5.10, Texture bias (upper 8 bits)

This register is used to configure the procedural texture unit.

Minification filter values:

Value	Description
0	Nearest
1	Linear
2	Nearest, Mipmap Nearest
3	Linear, Mipmap Nearest
4	Nearest, Mipmap Linear
5	Linear, Mipmap Linear

GPUREG_TEXUNIT3_PROCTEX5

Bits	Description
0-7	unsigned, Texture offset
8-31	0xE0C080

This register is used to set the procedural texture unit's offset.

GPUREG_PROCTEX_LUT

Bits	Description
0-7	unsigned, Index
8-11	unsigned, Reference table

This register is used to set which look-up table to write to, with GPUREG_PROCTEX_LUT_DATAi, at what index.

Reference table values:

Value	Description
0	Noise table
2	RGB mapping function table
3	Alpha mapping function table
4	Color table
5	Color difference table

GPUREG_PROCTEX_LUT_DATAi

Bits	Description
0-31	LUT data

These registers behave as a FIFO queue. Each write to these registers writes the provided value to the table selected with GPUREG_PROCTEX_LUT, starting at the selected index.

Noise Table

128 elements:

Bits	Description
0-11	fixed0.0.12, Value
12-23	fixed1.0.11, Difference from next element

RGB Mapping Function Table

128 elements:

Bits	Description
0-11	fixed0.0.12, Value
12-23	fixed1.0.11, Difference from next element

Alpha Mapping Function Table

128 elements:

Bits	Description
0-11	fixed0.0.12, Value
12-23	fixed1.0.11, Difference from next element

Color Table

256 elements:

Bits	Description
0-7	unsigned, Red
8-15	unsigned, Green
16-23	unsigned, Blue
24-31	unsigned, Alpha

Color Difference Table

256 elements:

Bits	Description
0-7	fixed1.0.7, Red difference between current and next color table elements
8-15	fixed1.0.7, Green difference between current and next color table elements
16-23	fixed1.0.7, Blue difference between current and next color table elements
24-31	fixed1.0.7, Alpha difference between current and next color table elements

GPUREG_TEXENVi_SOURCE

Bits	Description
0-3	unsigned, RGB source 0
4-7	unsigned, RGB source 1
8-11	unsigned, RGB source 2
16-19	unsigned, Alpha source 0
20-23	unsigned, Alpha source 1
24-27	unsigned, Alpha source 2

This register configures a texture combiner's sources.

Source values:

Value	Description
0	Primary color
1	Fragment primary color
2	Fragment secondary color
3	Texture 0
4	Texture 1
5	Texture 2
6	Texture 3
13	Previous buffer
14	Constant (from GPUREG_TEXENVi_COLOR)
15	Previous

GPUREG_TEXENVi_OPERAND

Bits	Description
0-3	unsigned, RGB operand 0
4-7	unsigned, RGB operand 1
8-11	unsigned, RGB operand 2
12-14	unsigned, Alpha operand 0
16-18	unsigned, Alpha operand 1
20-22	unsigned, Alpha operand 2

This register configures a texture combiner's operands.

RGB operand values:

Value	Description
0	Source color
1	One minus source color
2	Source alpha
3	One minus source alpha
4	Source red
5	One minus source red
8	Source green
9	One minus source green
12	Source blue
13	One minus source blue

Alpha operand values:

Value	Description
0	Source alpha
1	One minus source alpha
2	Source red
3	One minus source red
4	Source green
5	One minus source green
6	Source blue
7	One minus source blue

GPUREG_TEXENVi_COMBINER

Bits	Description
0-3	unsigned, RGB combine
16-19	unsigned, Alpha combine

This register configures a texture combiner's combine mode.

Combine values:

Value	Description
0	Replace
1	Modulate
2	Add
3	Add signed
4	Interpolate
5	Subtract
6	Dot3 RGB
7	Dot3 RGBA
8	Multiply then add
9	Add then multiply

GPUREG_TEXENVi_COLOR

Bits	Description
0-7	unsigned, Red
8-15	unsigned, Green
16-23	unsigned, Blue
24-31	unsigned, Alpha

This register configures a texture combiner's constant color.

GPUREG_TEXENVi_SCALE

Bits	Description
0-1	unsigned, RGB scale
16-17	unsigned, Alpha scale

This register configures a texture combiner's scale value.

Scale values:

Value	Description
0	1x
1	2x
2	4x

GPUREG_TEXENV_UPDATE_BUFFER

Bits	Description
0-2	unsigned, Fog mode
3	unsigned, Shading density source
8	unsigned, TexEnv 1 RGB buffer input
9	unsigned, TexEnv 2 RGB buffer input
10	unsigned, TexEnv 3 RGB buffer input
11	unsigned, TexEnv 4 RGB buffer input
12	unsigned, TexEnv 1 alpha buffer input
13	unsigned, TexEnv 2 alpha buffer input
14	unsigned, TexEnv 3 alpha buffer input
15	unsigned, TexEnv 4 alpha buffer input
16	unsigned, Z flip (0 = don't flip, 1 = flip)
24-25	0x0

This register is shared between the gas/fog mode configuration and texture combiner buffer inputs. Texture combiner buffer inputs are typically written with a mask of 0x2, and the gas/fog mode configuration is typically written with a mask of 0x5.

Fog mode values:

Value	Description
0	Disabled
5	Fog
7	Gas

Shading density source values:

Value	Description
0	Plain density
1	Depth density

Buffer input values:

Value	Description
0	Previous buffer
1	Previous

GPUREG_FOG_COLOR

Bits	Description
0-7	unsigned, Red
8-15	unsigned, Green
16-23	unsigned, Blue

This register is used to configure the color of fog.

GPUREG_GAS_ATTENUATION

Bits	Description
0-15	float1.5.10, Gas density attenuation

This register is used to configure the gas density attenuation.

GPUREG_GAS_ACCMAX

Bits	Description
0-15	float1.5.10, Gas maximum density accumulation

This register is used to configure the gas maximum density accumulation.

GPUREG_FOG_LUT_INDEX

Bits	Description
0-15	unsigned, Index

This register is used to set what index to write to with GPUREG_FOG_LUT_DATAi.

GPUREG_FOG_LUT_DATAi

Bits	Description
0-23	LUT data

These registers behave as a FIFO queue. Each write to these registers writes the provided value to the fog look-up table, starting at the index selected with GPUREG_FOG_LUT_INDEX.

Fog Look-Up Table

128 elements:

Bits	Description
0-12	fixed1.1.11, Difference from next element
13-23	fixed0.0.11, Value

GPUREG_TEXENV_BUFFER_COLOR

Bits	Description
0-7	unsigned, Red
8-15	unsigned, Green
16-23	unsigned, Blue
24-31	unsigned, Alpha

This register is used to configure the texture combiner buffer color.

Framebuffer registers

GPUREG_COLOR_OPERATION

Bits	Description
0-1	unsigned, Fragment operation mode
8	unsigned, Blend mode
16-25	0x0E4

This register is used to configure the fragment operation mode and whether to use logic ops or blending.

Fragment operation mode values:

Value	Description
0	Default
1	Gas
3	Shadow

Blend mode values:

Value	Description
0	Logic op
1	Blend

GPUREG_BLEND_FUNC

Bits	Description
0-2	unsigned, RGB equation
8-10	unsigned, Alpha equation
16-19	unsigned, RGB source function
20-23	unsigned, RGB destination function
24-27	unsigned, Alpha source function
28-31	unsigned, Alpha destination function

This register is used to configure the blending function.

Equation values:

Value	Description
0	Add
1	Subtract
2	Reverse subtract
3	Minimum
4	Maximum

Function values:

Value	Description
0	Zero
1	One
2	Source color
3	One minus source color
4	Destination color
5	One minus destination color
6	Source alpha
7	One minus source alpha
8	Destination alpha
9	One minus destination alpha
10	Constant color
11	One minus constant color
12	Constant alpha
13	One minus constant alpha
14	Source alpha saturate

GPUREG_LOGIC_OP

Bits	Description
0-3	unsigned, Logic op

This register is used to configure the logic op.

Logic op values:

Value	Description
0	Clear
1	AND
2	Reverse AND
3	Copy
4	Set
5	Inverted copy
6	Noop
7	Invert
8	NAND
9	OR
10	NOR
11	XOR
12	Equivalent
13	Inverted AND
14	Reverse OR
15	Inverted OR

GPUREG_BLEND_COLOR

Bits	Description
0-7	unsigned, Red
8-15	unsigned, Green
16-23	unsigned, Blue
24-31	unsigned, Alpha

This register is used to configure the blending color.

GPUREG_FRAGOP_ALPHA_TEST

Bits	Description
0	unsigned, Enabled (0 = disabled, 1 = enabled)
4-6	unsigned, Function
8-15	unsigned, Reference value

This register is used to configure alpha testing.

Function values:

Value	Description
0	Never
1	Always
2	Equal
3	Not equal
4	Less than
5	Less than or equal
6	Greater than
7	Greater than or equal

GPUREG_STENCIL_TEST

Bits	Description
0	unsigned, Enabled (0 = disabled, 1 = enabled)
4-6	unsigned, Function
8-15	unsigned, Buffer mask
16-23	signed, Reference value
24-31	unsigned, Mask

This register is used to configure stencil testing.

Function values:

Value	Description
0	Never
1	Always
2	Equal
3	Not equal
4	Less than
5	Less than or equal
6	Greater than
7	Greater than or equal

GPUREG_STENCIL_OP

Bits	Description
0-2	unsigned, Fail operation
4-6	unsigned, Z-fail operation
8-10	unsigned, Z-pass operation

This register is used to configure stencil result operations.

Operation values:

Value	Description
0	Keep
1	Zero
2	Replace
3	Increment
4	Decrement
5	Invert
6	Increment and wrap
7	Decrement and wrap

GPUREG_DEPTH_COLOR_MASK

Bits	Description
0	unsigned, Depth test enabled (0 = disabled, 1 = enabled)
4-6	unsigned, Depth function
8	unsigned, Red write enabled (0 = disabled, 1 = enabled)
9	unsigned, Green write enabled (0 = disabled, 1 = enabled)
10	unsigned, Blue write enabled (0 = disabled, 1 = enabled)
11	unsigned, Alpha write enabled (0 = disabled, 1 = enabled)
12	unsigned, Depth write enabled (0 = disabled, 1 = enabled)

This register is used to depth testing and framebuffer write masking.

Note that setting the "Depth test enabled" bit to 0 will not also disable depth writes. It will instead behave as if the depth function were set to "Always". To completely disable depth-related operations both the depth test and depth write bits must be disabled.

Depth function values:

Value	Description
0	Never
1	Always
2	Equal
3	Not equal
4	Less than
5	Less than or equal
6	Greater than
7	Greater than or equal

GPUREG_FRAMEBUFFER_INVALIDATE

Bits	Description
0	unsigned, Trigger (0 = idle, 1 = invalidate)
1-31	0x0

Writing 1 to this register invalidates the framebuffer cache. This should be done when changing the framebuffer or when it is cleared before rendering. Note that it does not flush the cache, so it should always be preceded by a write to GPUREG_FRAMEBUFFER_FLUSH.

GPUREG_FRAMEBUFFER_FLUSH

Bits	Description
0	unsigned, Trigger (0 = idle, 1 = flush)
1-31	0x0

Writing 1 to this register flushes the framebuffer cache to memory. This should be done after rendering before changing the framebuffer or using rendering results.

GPUREG_COLORBUFFER_READ

Bits	Description
0-3	unsigned, Allow read (0 = disable, 0xF = enable)

This register configures read access from the color buffer.

GPUREG_COLORBUFFER_WRITE

Bits	Description
0-3	unsigned, Allow write (0 = disable, 0xF = enable)

This register configures write access to the color buffer.

GPUREG_DEPTHBUFFER_READ

Bits	Description
0	unsigned, Allow stencil read (0 = disable, 1 = enable)
1	unsigned, Allow depth read (0 = disable, 1 = enable)

This register configures read access from the depth and stencil buffers.

GPUREG_DEPTHBUFFER_WRITE

Bits	Description
0	unsigned, Allow stencil write (0 = disable, 1 = enable)
1	unsigned, Allow depth write (0 = disable, 1 = enable)

This register configures write access to the depth and stencil buffers.

GPUREG_DEPTHBUFFER_FORMAT

Bits	Description
0-1	unsigned, Format

This register configures the depth buffer data format.

Format values:

Value	Description
0	16-bit depth
2	24-bit depth
3	24-bit depth + 8-bit stencil

GPUREG_COLORBUFFER_FORMAT

Bits	Description
0-1	unsigned, Pixel size
16-18	unsigned, Format

This register configures the color buffer data format. Color components are laid out in reverse byte order in memory, with the most significant bits used first.

Pixel size values:

Value	Description
0	16-bit color
2	32-bit color

Format values:

Value	Description
0	RGBA8/Gas
2	RGB5A1
3	RGB565
4	RGBA4

GPUREG_EARLYDEPTH_TEST2

Bits	Description
0	unsigned, Enabled (0 = disabled, 1 = enabled)

This register enables the early depth test.

GPUREG_FRAMEBUFFER_BLOCK32

Bits	Description
0	unsigned, Render block mode

This register configures the framebuffer block mode. To untile the color buffer when using the 32x32 block format, use bit 16 of the display transfer flags. It is unknown if there are any advantages to using the 32x32 format.

Render block mode values:

Value	Description
0	8x8 blocks
1	32x32 blocks

GPUREG_DEPTHBUFFER_LOC

Bits	Description
0-27	unsigned, Depth buffer physical address >> 3

This register configures the depth buffer physical address.

GPUREG_COLORBUFFER_LOC

Bits	Description
0-27	unsigned, Color buffer physical address >> 3

This register configures the color buffer physical address.

GPUREG_FRAMEBUFFER_DIM

Bits	Description
0-10	unsigned, Width
12-21	unsigned, Height - 1
24	0x1

This register configures the framebuffer dimensions.

GPUREG_GAS_LIGHT_XY

Bits	Description
0-7	unsigned, Planar shading minimum intensity
8-15	unsigned, Planar shading maximum intensity
16-23	unsigned, Planar shading density attenuation

This register configures gas light planar shading.

GPUREG_GAS_LIGHT_Z

Bits	Description
0-7	unsigned, View shading minimum intensity
8-15	unsigned, View shading maximum intensity
16-23	unsigned, View shading density attenuation

This register configures gas light view shading.

GPUREG_GAS_LIGHT_Z_COLOR

Bits	Description
0-7	unsigned, View shading effect in line-of-sight direction
8	Gas color LUT input

This register configures gas light shading in the line-of-sight direction, and the input to the gas color LUT.

Color LUT input values:

Value	Description
0	Gas density
1	Light factor

GPUREG_GAS_LUT_INDEX

Bits	Description
0-15	unsigned, Index

This register is used to set what index to write to with GPUREG_GAS_LUT_DATAi.

GPUREG_GAS_LUT_DATA

Bits	Description
0-31	LUT data

These registers behave as a FIFO queue. Each write to these registers writes the provided value to the gas look-up table, starting at the index selected with GPUREG_GAS_LUT_INDEX.

Gas Look-Up Table

16 elements:

First 8 elements:

Bits	Description
0-7	signed, Red
8-15	signed, Green
16-23	signed, Blue

Last 8 elements:

Bits	Description
0-7	unsigned, Red
8-15	unsigned, Green
16-23	unsigned, Blue

GPUREG_GAS_DELTAZ_DEPTH

Bits	Description
0-23	fixed0.16.8, Depth direction attenuation proportion

This register is used to configure the gas depth direction attenuation proportion.

GPUREG_FRAGOP_SHADOW

Bits	Description
0-15	float1.5.10, Sum of penumbra scale and penumbra bias
16-31	float1.5.10, Penumbra scale with reversed sign

This register is used to configure shadow properties.

Fragment lighting registers

GPUREG_LIGHTi_SPECULAR0

Bits	Description
0-7	unsigned, Blue
10-17	unsigned, Green
20-27	unsigned, Red

These registers contain the specular0 color of the corresponding light. Usually set to material_specular0*lightX_specular0.

GPUREG_LIGHTi_SPECULAR1

Bits	Description
0-7	unsigned, Blue
10-17	unsigned, Green
20-27	unsigned, Red

These registers contain the specular1 color of the corresponding light. Usually set to material_specular1*lightX_specular1.

GPUREG_LIGHTi_DIFFUSE

Bits	Description
0-7	unsigned, Blue
10-17	unsigned, Green
20-27	unsigned, Red

These registers contain the diffuse color of the corresponding light. Usually set to material_diffuse*lightX_diffuse.

GPUREG_LIGHTi_AMBIENT

Bits	Description
0-7	unsigned, Blue
10-17	unsigned, Green
20-27	unsigned, Red

These registers contain the ambient color of the corresponding light. Usually set to material_ambient*lightX_ambient.

GPUREG_LIGHTi_XY

Bits	Description
0-15	float1.5.10, X coordinate
16-31	float1.5.10, Y coordinate

These registers (along with GPUREG_LIGHTi_Z) represent the light position (for a positional light) or the light direction vector (for a directional light) of the corresponding light.

GPUREG_LIGHTi_Z

Bits	Description
0-15	float1.5.10, Z coordinate

These registers (along with GPUREG_LIGHTi_XY) represent the light position (for a positional light) or the light direction vector (for a directional light) of the corresponding light.

GPUREG_LIGHTi_SPOTDIR_XY

Bits	Description
0-12	fixed1.1.11, X coordinate (negated)
16-28	fixed1.1.11, Y coordinate (negated)

These registers (along with GPUREG_LIGHTi_SPOTDIR_Z) represent the spot direction (unitary) vector of the corresponding light.

GPUREG_LIGHTi_SPOTDIR_Z

Bits	Description
0-12	fixed1.1.11, Z coordinate (negated)

These registers (along with GPUREG_LIGHTi_SPOTDIR_XY) represent the spot direction (unitary) vector of the corresponding light.

GPUREG_LIGHTi_CONFIG

Bits	Description
0	unsigned, Light type (0 = positional light, 1 = directional light)
1	unsigned, Two side diffuse (0 = one side, 1 = both sides)
2	unsigned, Use geometric factor 0 (0 = don't use, 1 = use)
3	unsigned, Use geometric factor 1 (0 = don't use, 1 = use)

This register configures a light's properties.

GPUREG_LIGHTi_ATTENUATION_BIAS

Bits	Description
0-19	float1.7.12, Distance attenuation bias

These registers contain the distance attenuation bias value of the corresponding light. The attenuation factor is DA(clip(bias + scale*distance, 0.0, 1.0)).

GPUREG_LIGHTi_ATTENUATION_SCALE

Bits	Description
0-19	float1.7.12, Distance attenuation scale

These registers contain the distance attenuation scale value of the corresponding light. The attenuation factor is DA(clip(bias + scale*distance, 0.0, 1.0)).

GPUREG_LIGHTING_AMBIENT

Bits	Description
0-7	unsigned, Blue
10-17	unsigned, Green
20-27	unsigned, Red

This register contains the initial value of the fragment primary color before the partial colors that correspond to each enabled light are added. Usually set to material_emission + material_ambient*scene_ambient.

GPUREG_LIGHTING_NUM_LIGHTS

Bits	Description
0-2	unsigned, Number of active lights - 1

This register configures the number of active lights.

GPUREG_LIGHTING_CONFIG0

Bits	Description
0	unsigned, Shadow factor enabled (0 = disabled, 1 = enabled) (usually accompanied by bit 16, 17, or 18)
2-3	unsigned, Fresnel selector
4-7	unsigned, Light environment configuration
8-11	0x4
16	unsigned, Apply shadow attenuation to primary color (0 = don't apply, 1 = apply)
17	unsigned, Apply shadow attenuation to secondary color (0 = don't apply, 1 = apply)
18	unsigned, Invert shadow attenuation (0 = don't invert, 1 = invert)
19	unsigned, Apply shadow attenuation to alpha component (0 = don't apply, 1 = apply)
22-23	unsigned, Bump map texture unit
24-25	unsigned, Shadow map texture unit
27	unsigned, Clamp highlights (0 = disabled, 1 = enabled)
28-29	unsigned, Bump mode
30	unsigned, Recalculate bump vectors (0 = enabled, 1 = disabled) (usually set to 1 when bump mode is not 0)
31	0x1

This register configures the light environment.

Fresnel selector values:

Value	Description
0	None
1	Primary alpha
2	Secondary alpha
3	Primary and secondary alpha

The light environment configuration controls which LUTs are available for use. If a LUT is not available in the selected configuration, its value will always read a constant 1.0 regardless of the enable state in GPUREG_LIGHTING_CONFIG1. If RR is enabled but not RG or RB, the output of RR is used for the three components; Red, Green and Blue.

Light environment configuration values:

Value	Description	Available LUTs
0	Configuration 0	D0, RR, SP, DA
1	Configuration 1	FR, RR, SP, DA
2	Configuration 2	D0, D1, RR, DA
3	Configuration 3	D0, D1, FR, DA
4	Configuration 4	All except for FR
5	Configuration 5	All except for D1
6	Configuration 6	All except for RB and RG
8	Configuration 7	All

Bump mode values:

Value	Description
0	Not used
1	Use as bump map
2	Use as tangent map

GPUREG_LIGHTING_CONFIG1

Bits	Description
0	unsigned, Fragment light source 0 shadows disabled (0 = enabled, 1 = disabled)
1	unsigned, Fragment light source 1 shadows disabled (0 = enabled, 1 = disabled)
2	unsigned, Fragment light source 2 shadows disabled (0 = enabled, 1 = disabled)
3	unsigned, Fragment light source 3 shadows disabled (0 = enabled, 1 = disabled)
4	unsigned, Fragment light source 4 shadows disabled (0 = enabled, 1 = disabled)
5	unsigned, Fragment light source 5 shadows disabled (0 = enabled, 1 = disabled)
6	unsigned, Fragment light source 6 shadows disabled (0 = enabled, 1 = disabled)
7	unsigned, Fragment light source 7 shadows disabled (0 = enabled, 1 = disabled)
8	unsigned, Fragment light source 0 spot light disabled (0 = enabled, 1 = disabled)
9	unsigned, Fragment light source 1 spot light disabled (0 = enabled, 1 = disabled)
10	unsigned, Fragment light source 2 spot light disabled (0 = enabled, 1 = disabled)
11	unsigned, Fragment light source 3 spot light disabled (0 = enabled, 1 = disabled)
12	unsigned, Fragment light source 4 spot light disabled (0 = enabled, 1 = disabled)
13	unsigned, Fragment light source 5 spot light disabled (0 = enabled, 1 = disabled)
14	unsigned, Fragment light source 6 spot light disabled (0 = enabled, 1 = disabled)
15	unsigned, Fragment light source 7 spot light disabled (0 = enabled, 1 = disabled)
16	unsigned, Term 0 distribution component D0 LUT disabled (0 = enabled, 1 = disabled)
17	unsigned, Term 1 distribution component D1 LUT disabled (0 = enabled, 1 = disabled)
18	0x1
19	unsigned, Fresnel FR LUT disabled (0 = enabled, 1 = disabled)
20-22	unsigned, Term 1 reflection component RB LUT disabled (0 = enabled, 7 = disabled)
21	unsigned, Term 1 reflection component RG LUT disabled (0 = enabled, 7 = disabled)
22	unsigned, Term 1 reflection component RR LUT disabled (0 = enabled, 7 = disabled)
24	unsigned, Fragment light source 0 distance attenuation disabled (0 = enabled, 1 = disabled)
25	unsigned, Fragment light source 1 distance attenuation disabled (0 = enabled, 1 = disabled)
26	unsigned, Fragment light source 2 distance attenuation disabled (0 = enabled, 1 = disabled)
27	unsigned, Fragment light source 3 distance attenuation disabled (0 = enabled, 1 = disabled)
28	unsigned, Fragment light source 4 distance attenuation disabled (0 = enabled, 1 = disabled)
29	unsigned, Fragment light source 5 distance attenuation disabled (0 = enabled, 1 = disabled)
30	unsigned, Fragment light source 6 distance attenuation disabled (0 = enabled, 1 = disabled)
31	unsigned, Fragment light source 7 distance attenuation disabled (0 = enabled, 1 = disabled)

This register is used to disable various aspects of the light environment.

GPUREG_LIGHTING_LUT_INDEX

Bits	Description
0-7	unsigned, Starting index
8-12	unsigned, Look-up table

This register controls which LUT and what offset into it the GPUREG_LIGHTING_LUT_DATAi register writes to.

Lookup table values:

Value	Description
0	D0
1	D1
3	FR
4	RB
5	RG
6	RR
8-15	SP0-7
16-23	DA0-7

GPUREG_LIGHTING_ENABLE1

Bits	Description
0	unsigned, Disabled (0 = enabled, 1 = disabled)

This register is set to 1 when fragment lighting is disabled, and to 0 when it is enabled.

GPUREG_LIGHTING_LUT_DATAi

Bits	Description
0-23	LUT data

Lighting LUT data is written here.

A LUT contains data for the input domain [-1.0, 1.0], which is indexed using a signed 8-bit number [-128, 127]. Therefore a LUT contains 256 entries. The index of a value is (int)(x/127.0f) & 0xFF.

DA: The input domain is [0.0, 1.0], and the index is an unsigned 8-bit number [0, 255] instead.

Format of an entry:

Bits	Description
0-11	fixed0.0.12, Entry value
12-23	fixed1.0.11, Absolute value of the difference between the next entry and this entry, used to implement linear interpolation

GPUREG_LIGHTING_LUTINPUT_ABS

Bits	Description
1	unsigned, abs() flag for the input of D0 (0 = enabled, 1 = disabled)
5	unsigned, abs() flag for the input of D1 (0 = enabled, 1 = disabled)
9	unsigned, abs() flag for the input of SP (0 = enabled, 1 = disabled)
13	unsigned, abs() flag for the input of FR (0 = enabled, 1 = disabled)
17	unsigned, abs() flag for the input of RB (0 = enabled, 1 = disabled)
21	unsigned, abs() flag for the input of RG (0 = enabled, 1 = disabled)
25	unsigned, abs() flag for the input of RR (0 = enabled, 1 = disabled)

This register controls whether the absolute value of the input is taken before using a LUT.

GPUREG_LIGHTING_LUTINPUT_SELECT

Bits	Description
0-2	unsigned, Input selector for D0
4-6	unsigned, Input selector for D1
8-10	unsigned, Input selector for SP
12-14	unsigned, Input selector for FR
16-18	unsigned, Input selector for RB
20-22	unsigned, Input selector for RG
24-26	unsigned, Input selector for RR

This register selects the input from LUTs.

Input selector values:

Value	Description
0	N·H
1	V·H
2	N·V
3	L·N
4	-L·P (aka Spotlight aka SP)
5	cos φ (aka CP)

GPUREG_LIGHTING_LUTINPUT_SCALE

Bits	Description
0-2	unsigned, Scaler selector for D0
4-6	unsigned, Scaler selector for D1
8-10	unsigned, Scaler selector for SP
12-14	unsigned, Scaler selector for FR
16-18	unsigned, Scaler selector for RB
20-22	unsigned, Scaler selector for RG
24-26	unsigned, Scaler selector for RR

This register controls the scaling that is applied to the output of a LUT.

Scaler selector values:

Value	Description
0	1x
1	2x
2	4x
3	8x
6	0.25x
7	0.5x

GPUREG_LIGHTING_LIGHT_PERMUTATION

Bits	Description
0-2	unsigned, ID of the 1st enabled light
4-6	unsigned, ID of the 2nd enabled light
8-10	unsigned, ID of the 3rd enabled light
12-14	unsigned, ID of the 4th enabled light
16-18	unsigned, ID of the 5th enabled light
20-22	unsigned, ID of the 6th enabled light
24-26	unsigned, ID of the 7th enabled light
28-30	unsigned, ID of the 8th enabled light

This register sets the IDs of enabled light sources.

Geometry pipeline registers

GPUREG_ATTRIBBUFFERS_LOC

Bits	Description
1-28	unsigned, Vertex arrays base address

This register sets the base address of all vertex arrays.

GPUREG_ATTRIBBUFFERS_FORMAT_LOW

Bits	Description
0-1	unsigned, Vertex attribute 0 type
2-3	unsigned, Vertex attribute 0 size
4-5	unsigned, Vertex attribute 1 type
6-7	unsigned, Vertex attribute 1 size
8-9	unsigned, Vertex attribute 2 type
10-11	unsigned, Vertex attribute 2 size
12-13	unsigned, Vertex attribute 3 type
14-15	unsigned, Vertex attribute 3 size
16-17	unsigned, Vertex attribute 4 type
18-19	unsigned, Vertex attribute 4 size
20-21	unsigned, Vertex attribute 5 type
22-23	unsigned, Vertex attribute 5 size
24-25	unsigned, Vertex attribute 6 type
26-27	unsigned, Vertex attribute 6 size
28-29	unsigned, Vertex attribute 7 type
30-31	unsigned, Vertex attribute 7 size

This register configures the types and sizes of the first 8 vertex attributes.

Vertex attribute type values:

Value	Description
0	Byte
1	Unsigned byte
2	Short
3	Float

Vertex attribute size values:

Value	Description
0	8 bits
1	16 bits
2	24 bits
3	32 bits

GPUREG_ATTRIBBUFFERS_FORMAT_HIGH

Bits	Description
0-1	unsigned, Vertex attribute 8 type
2-3	unsigned, Vertex attribute 8 size
4-5	unsigned, Vertex attribute 9 type
6-7	unsigned, Vertex attribute 9 size
8-9	unsigned, Vertex attribute 10 type
10-11	unsigned, Vertex attribute 10 size
12-13	unsigned, Vertex attribute 11 type
14-15	unsigned, Vertex attribute 11 size
16-27	unsigned, Fixed vertex attribute mask
28-31	unsigned, Total vertex attribute count - 1

This register configures the types and sizes of the last 4 vertex attributes, along with the attribute mask and the total attribute count.

See GPUREG_ATTRIBBUFFERS_FORMAT_LOW for vertex attribute type and size values.

GPUREG_ATTRIBBUFFERi_OFFSET

Bits	Description
0-27	unsigned, Offset from base vertex arrays address

This register configures the offset of a vertex array from the base vertex arrays address.

GPUREG_ATTRIBBUFFERi_CONFIG1

Bits	Description
0-3	unsigned, Component 1
4-7	unsigned, Component 2
8-11	unsigned, Component 3
12-15	unsigned, Component 4
16-19	unsigned, Component 5
20-23	unsigned, Component 6
24-27	unsigned, Component 7
28-31	unsigned, Component 8

This register configures the first 8 component types of a vertex array.

Component values:

Value	Description
0	Vertex attribute 0
1	Vertex attribute 1
2	Vertex attribute 2
3	Vertex attribute 3
4	Vertex attribute 4
5	Vertex attribute 5
6	Vertex attribute 6
7	Vertex attribute 7
8	Vertex attribute 8
9	Vertex attribute 9
10	Vertex attribute 10
11	Vertex attribute 11
12	4-byte padding
13	8-byte padding
14	12-byte padding
15	16-byte padding

GPUREG_ATTRIBBUFFERi_CONFIG2

Bits	Description
0-3	unsigned, Component 9
4-7	unsigned, Component 10
8-11	unsigned, Component 11
12-15	unsigned, Component 12
16-23	unsigned, Bytes per vertex
28-31	unsigned, Total number of components

This register configures the last 4 component types of a vertex array, along with the bytes per vertex and the total number of components.

See GPUREG_ATTRIBBUFFERi_CONFIG1 for component values.

GPUREG_INDEXBUFFER_CONFIG

Bits	Description
0-27	unsigned, Offset from base vertex arrays address
31	Index type (0 = unsigned byte, 1 = unsigned short or drawing arrays)

This register configures the index array used when drawing elements.

GPUREG_NUMVERTICES

Bits	Description
0-31	unsigned, Number of vertices to render

This register sets the number of vertices to render.

GPUREG_GEOSTAGE_CONFIG

Bits	Description
0-1	unsigned, Geometry shader in use (0 = not in use, 2 = in use)
8	unsigned, Drawing triangle elements (0 = not, 1 = drawing triangle elements)
9	0x0
31	unsigned, Use reserved geometry shader subdivision (0 = don't use, 1 = use)

This register configures the geometry stage of the GPU pipeline.

When using vertex buffers and drawing elements in triangles mode, bit 8 is set to 1, else it is set to 0.

GPUREG_VERTEX_OFFSET

Bits	Description
0-31	unsigned, Starting vertex offset

This register sets the offset of the first vertex in an array to render.

GPUREG_POST_VERTEX_CACHE_NUM

Bits	Description
0-7	unsigned, Number of entries in the post-vertex cache (usually 0x4 or 0x84)

This register configures the post-vertex cache.

GPUREG_DRAWARRAYS

Bits	Description
0-31	unsigned, Trigger (0 = idle, non-zero = draw arrays)

This register triggers drawing vertex arrays.

GPUREG_DRAWELEMENTS

Bits	Description
0-31	unsigned, Trigger (0 = idle, non-zero = draw elements)

This register triggers drawing vertex array elements.

GPUREG_VTX_FUNC

Bits	Description
0-31	unsigned, Trigger (0 = idle, non-zero = clear post-vertex cache)

This register triggers clearing the post-vertex cache.

GPUREG_FIXEDATTRIB_INDEX

Bits	Description
0-3	unsigned, Fixed attribute index (0-11, 0xF = immediate-mode submission)

This register selects the index of the fixed attribute to be input with GPUREG_FIXEDATTRIB_DATAi. See GPU/Fixed Vertex Attributes and GPU/Immediate-Mode Vertex Submission for usage info.

GPUREG_FIXEDATTRIB_DATAi

Bits	Description
DATA0:
0-7	float1.7.16, Vertex attribute element 3 (Z) (bits 16-23)
8-31	float1.7.16, Vertex attribute element 4 (W)
DATA1:
0-15	float1.7.16, Vertex attribute element 2 (Y) (bits 8-23)
16-31	float1.7.16, Vertex attribute element 3 (Z) (bits 0-15)
DATA2:
0-23	float1.7.16, Vertex attribute element 1 (X)
24-31	float1.7.16, Vertex attribute element 2 (Y) (bits 0-7)

Accepts four 24-bit floating-point values that make up a vertex attribute. Stored in the fixed attribute currently specified with GPUREG_FIXEDATTRIB_INDEX. If immediate-mode vertex submission is enabled (by writing 0xF to the index register) then vertex data is input here directly.

GPUREG_CMDBUF_SIZE0

Bits	Description
0-20	unsigned, Size of command buffer 0 >> 3

This register sets the size of the first command buffer.

GPUREG_CMDBUF_SIZE1

Bits	Description
0-20	unsigned, Size of command buffer 1 >> 3

This register sets the size of the second command buffer.

GPUREG_CMDBUF_ADDR0

Bits	Description
0-28	unsigned, Physical address of command buffer 0 >> 3

This register sets the physical address of the first command buffer.

GPUREG_CMDBUF_ADDR1

Bits	Description
0-28	unsigned, Physical address of command buffer 1 >> 3

This register sets the physical address of the second command buffer.

GPUREG_CMDBUF_JUMP0

Bits	Description
0-31	unsigned, Trigger (0 = idle, non-zero = execute command buffer 0)

This register triggers a jump to the first command buffer.

GPUREG_CMDBUF_JUMP1

Bits	Description
0-31	unsigned, Trigger (0 = idle, non-zero = execute command buffer 1)

This register triggers a jump to the second command buffer.

GPUREG_VSH_NUM_ATTR

Bits	Description
0-3	unsigned, Number of vertex shader input attributes - 1

This register sets the number of vertex shader input attributes.

GPUREG_VSH_COM_MODE

Bits	Description
0	unsigned, Geometry shader configuration enabled (0 = disabled, 1 = enabled)

This register sets whether to use the geometry shader configuration or reuse the vertex shader configuration for the geometry shader shading unit.

GPUREG_START_DRAW_FUNC0

Bits	Description
0	unsigned, Mode (0 = drawing, 1 = configuration)
1-7	0x0

This register is related to drawing. When the mode value is set to 1, rendering is not performed properly. When set to 0, changes to the vertex shader configuration registers are not applied correctly. Because of this, it is usually initialized to 1, set to 0 immediately before triggering a draw, and set back to 1 immediately after triggering a draw.

GPUREG_VSH_OUTMAP_TOTAL1

Bits	Description
0-3	unsigned, Number of vertex shader output map registers - 1

This register sets the number of vertex shader output map registers.

GPUREG_VSH_OUTMAP_TOTAL2

Bits	Description
0-3	unsigned, Number of vertex shader output map registers - 1

This register sets the number of vertex shader output map registers.

GPUREG_GSH_MISC0

Bits	Description
0-31	unsigned, Misc data (0x00000001 = Reserved geometry shader subdivision in use, 0x01004302 = Particle system in use, 0 otherwise)

This register configures miscellaneous geometry shader properties.

GPUREG_GEOSTAGE_CONFIG2

Bits	Description
0	unsigned, Function indicator (with vertex buffers: 0 = draw elements, 1 = draw arrays, without: 0 = not inputting, 1 = inputting vertex attribute data)
8	unsigned, Drawing triangle elements (0 = not, 1 = drawing triangle elements)

This register configures the geometry stage of the GPU pipeline.

When using vertex buffers, bit 0 is set to 1 before drawing arrays, and cleared to 0 immediately after. When using immediate mode to directly input vertex attribute data, bit 0 is set to 1 before inputting vertex attribute data, and cleared to 0 immediately after. While bit 0 is set to 1, some register writes outside of the 0x200-0x254 and 0x280-0x2DF ranges may be processed incorrectly.

When using vertex buffers and drawing elements in triangles mode, bit 8 is set to 1, else it is set to 0.

GPUREG_GSH_MISC1

Bits	Description
0-4	unsigned, Reserved geometry shader subdivision type (2 = Loop, 3 = Catmull-Clark)

This register configures the type of reserved geometry shader subdivision in use. The value is ignored when a subdivision is not in use.

GPUREG_PRIMITIVE_CONFIG

Bits	Description
0-3	unsigned, Number of vertex shader output map registers - 1
8-9	unsigned, Primitive mode

This register configures primitive drawing.

Primitive mode value:

Value	Description
0	Triangles
1	Triangle strip
2	Triangle fan
3	Geometry primitive

GPUREG_RESTART_PRIMITIVE

Bits	Description
0	unsigned, Trigger (0 = idle, 1 = reset primitive)
1-31	0x0

This register triggers resetting primitive drawing.

Shader registers

GPUREG_SH_BOOLUNIFORM

Bits	Description
0	unsigned, Boolean register b0 value (0 = false, 1 = true)
1	unsigned, Boolean register b1 value (0 = false, 1 = true)
2	unsigned, Boolean register b2 value (0 = false, 1 = true)
3	unsigned, Boolean register b3 value (0 = false, 1 = true)
4	unsigned, Boolean register b4 value (0 = false, 1 = true)
5	unsigned, Boolean register b5 value (0 = false, 1 = true)
6	unsigned, Boolean register b6 value (0 = false, 1 = true)
7	unsigned, Boolean register b7 value (0 = false, 1 = true)
8	unsigned, Boolean register b8 value (0 = false, 1 = true)
9	unsigned, Boolean register b9 value (0 = false, 1 = true)
10	unsigned, Boolean register b10 value (0 = false, 1 = true)
11	unsigned, Boolean register b11 value (0 = false, 1 = true)
12	unsigned, Boolean register b12 value (0 = false, 1 = true)
13	unsigned, Boolean register b13 value (0 = false, 1 = true)
14	unsigned, Boolean register b14 value (0 = false, 1 = true)
15	unsigned, Boolean register b15 value (0 = false, 1 = true)
16-31	0x7FFF

This register is used to set a shader unit's boolean registers.

GPUREG_SH_INTUNIFORM_Ii

Bits	Description
0-7	unsigned, Integer register ii X value
8-15	unsigned, Integer register ii Y value
16-23	unsigned, Integer register ii Z value
24-31	unsigned, Integer register ii W value

These registers are used to set a shader unit's integer registers.

GPUREG_SH_INPUTBUFFER_CONFIG

Bits	Description
0-3	unsigned, Input vertex attributes - 1
8-15	unsigned, Use reserved geometry shader subdivision (0 = don't use, 1 = use) (always 0 for vertex shaders)
16-23	0x0
24-31	unsigned, Use geometry shader (0x8 = use, 0xA0 = don't use) (always 0xA0 for vertex shaders)

This register is used to configure a shader unit's input buffer.

GPUREG_SH_ENTRYPOINT

Bits	Description
0-15	unsigned, Code entry point offset, in 32-bit words
16-31	0x7FFF

This register sets a shader unit's code entry point.

For geometry shaders, this sets the entry point for the single shader unit which can be dedicated to running geometry shaders, regardless of the current geometry stage mode. This is means that while this register is normally used to set the geometry shader entry point, it can also be used to set this single shader unit to run from a different entry point than the other three, even when running a vertex shader.

For vertex shaders, this sets the entry point for the shader units set to vertex shader mode. Depending on the current geometry stage mode this can include either all 4 shader units or just 3 of them.

GPUREG_SH_ATTRIBUTES_PERMUTATION_LOW

Bits	Description
0-3	unsigned, Vertex attribute 0 input register index
4-7	unsigned, Vertex attribute 1 input register index
8-11	unsigned, Vertex attribute 2 input register index
12-15	unsigned, Vertex attribute 3 input register index
16-19	unsigned, Vertex attribute 4 input register index
20-23	unsigned, Vertex attribute 5 input register index
24-27	unsigned, Vertex attribute 6 input register index
28-31	unsigned, Vertex attribute 7 input register index

This register sets the shader unit input register index which will correspond to each attribute contained by the input buffer (which in the case of geometry shaders is the vertex shader output buffer) for the first 8 attributes. For example, having bits 0-3 set to 5 means that, in the shader program, v5 will contain the input buffer's 1st attribute.

GPUREG_SH_ATTRIBUTES_PERMUTATION_HIGH

Bits	Description
0-3	unsigned, Vertex attribute 8 input register index
4-7	unsigned, Vertex attribute 9 input register index
8-11	unsigned, Vertex attribute 10 input register index
12-15	unsigned, Vertex attribute 11 input register index
16-19	unsigned, Vertex attribute 12 input register index
20-23	unsigned, Vertex attribute 13 input register index
24-27	unsigned, Vertex attribute 14 input register index
28-31	unsigned, Vertex attribute 15 input register index

This register sets the shader unit input register index which will correspond to each attribute contained by the input buffer (which in the case of geometry shaders is the vertex shader output buffer) for attributes 8 through 15. For example, having bits 0-3 set to 5 means that, in the shader program, v5 will contain the input buffer's 9th attribute.

GPUREG_SH_OUTMAP_MASK

Bits	Description
0	unsigned, Output register o0 enabled (0 = disabled, 1 = enabled)
1	unsigned, Output register o1 enabled (0 = disabled, 1 = enabled)
2	unsigned, Output register o2 enabled (0 = disabled, 1 = enabled)
3	unsigned, Output register o3 enabled (0 = disabled, 1 = enabled)
4	unsigned, Output register o4 enabled (0 = disabled, 1 = enabled)
5	unsigned, Output register o5 enabled (0 = disabled, 1 = enabled)
6	unsigned, Output register o6 enabled (0 = disabled, 1 = enabled)
7	unsigned, Output register o7 enabled (0 = disabled, 1 = enabled) (vertex shader only)
8	unsigned, Output register o8 enabled (0 = disabled, 1 = enabled) (vertex shader only)
9	unsigned, Output register o9 enabled (0 = disabled, 1 = enabled) (vertex shader only)
10	unsigned, Output register o10 enabled (0 = disabled, 1 = enabled) (vertex shader only)
11	unsigned, Output register o11 enabled (0 = disabled, 1 = enabled) (vertex shader only)
12	unsigned, Output register o12 enabled (0 = disabled, 1 = enabled) (vertex shader only)
13	unsigned, Output register o13 enabled (0 = disabled, 1 = enabled) (vertex shader only)
14	unsigned, Output register o14 enabled (0 = disabled, 1 = enabled) (vertex shader only)
15	unsigned, Output register o15 enabled (0 = disabled, 1 = enabled) (vertex shader only)
16-31	0x0

This register toggles a shader unit's output registers.

GPUREG_SH_CODETRANSFER_END

Bits	Description
0-31	unsigned, Signal transfer end (0 = idle, non-zero = signal)

This register's value should be set to 1 in order to finalize the transfer of shader code.

GPUREG_SH_FLOATUNIFORM_INDEX

Bits	Description
0-7	unsigned, Target floating-point register index (range 0-95, where 0 = c0 and 95 = c95)
31	unsigned, Transfer mode (0 = float1.7.16, 1 = float1.8.23)

This register sets the shader unit's target floating-point register and transfer mode for the data transfer system. As such it is typically used right before GPUREG_SH_FLOATUNIFORM_DATAi, though writing to one register does not make writing to the other mandatory.

GPUREG_SH_FLOATUNIFORM_DATAi

Bits	Description
0-31	Floating-point register component data

This register is used to set the components of a shader unit's floating-point registers, each having 4 components. The data format which should be written to it depends on the transfer mode set with GPUREG_SH_FLOATUNIFORM_INDEX. This register functions as a FIFO queue: after each time a 4-component uniform register is successfully set, the target register index is incremented, meaning that groups of uniforms with contiguous register IDs can be set with only one initial write to GPUREG_SH_FLOATUNIFORM_INDEX.

• In the case of float24 transfer mode, data should be sent by writing three words which are the concatenation of the float24 value of the uniform register's 4 components, in the reverse order. Assuming each letter corresponds to 4 bits, the format becomes:
  • first word : ZZWWWWWW
  • second word : YYYYZZZZ
  • third word : XXXXXXYY
• In the case of float32 transfer mode, data should be sent by writing four words which are each the float32 value of the uniform register's 4 components, in the reverse order.

GPUREG_SH_CODETRANSFER_INDEX

Bits	Description
0-11	unsigned, Target shader code offset

This register is used to set the offset at which upcoming shader code data transferred through GPUREG_SH_CODETRANSFER_DATAi should be written.

GPUREG_SH_CODETRANSFER_DATAi

Bits	Description
0-31	unsigned, Shader instruction data

This register is used to transfer shader code data. This register behaves as a FIFO queue: each write to this register writes the provided value to the GPU shader code memory bank at the offset initially set by GPUREG_SH_CODETRANSFER_INDEX. The offset in question is incremented after each write to this register.

GPUREG_SH_OPDESCS_INDEX

Bits	Description
0-11	unsigned, Target shader operand descriptor offset

This register is used to set the offset at which upcoming shader operand descriptor data transferred through GPUREG_SH_OPDESCS_DATAi should be written.

GPUREG_SH_OPDESCS_DATAi

Bits	Description
0-31	unsigned, Shader operand descriptor data

This register is used to transfer shader operand descriptor data. This register behaves as a FIFO queue: each write to this register writes the provided value to the GPU shader operand descriptor memory bank at the offset initially set by GPUREG_SH_OPDESCS_INDEX. The offset in question is incremented after each write to this register.