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| This page describes the [[GPU_Commands|GPU commands]] used for textures. | | This page is obsolete, see [[GPU/Internal_Registers|here]] for GPU register information, including that of textures. |
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| == Texture unit setup: Register 0x80 ==
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| Register 0x80 is used to enable individual texture units.
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| {| class="wikitable" border="1"
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| ! Bit
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| ! Description
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| |-
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| | 0
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| | Enable texture unit 0.
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| |-
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| | 1
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| | Enable texture unit 1.
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| |-
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| | 2
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| | Enable texture unit 2.
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| |}
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| == Configuration of texture unit 0 ==
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| {| class="wikitable" border="1"
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| ! Register ID
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| ! Description
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| |-
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| | 0x0081
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| | Border color (unverified)
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| |-
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| | 0x0082
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| | Bits 16-31 are the texture width. Bits 0-15 are the texture height. The maximum texture size in either direction is 1024.
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| |-
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| | 0x0083
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| | Texture parameters (filtering, wrapping), see below.
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| |-
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| | 0x0084
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| | LOD setup?
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| |-
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| | 0x0085
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| | Physical address of texture data (divided by 8).
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| |-
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| | 0x0086
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| | Physical address of texture data for cube mapping?
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| |-
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| | 0x0087
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| | Physical address of texture data for cube mapping?
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| |-
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| | 0x0088
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| | Physical address of texture data for cube mapping?
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| |-
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| | 0x0089
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| | Physical address of texture data for cube mapping?
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| |-
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| | 0x008A
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| | Physical address of texture data for cube mapping?
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| |-
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| | 0x008B
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| | Shadow related?
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| |-
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| | 0x008E
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| | Texture format (see below)
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| |}
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| == Configuration of texture units 1 and 2 ==
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| Texture units 1 and 2 use a configuration block similar to the one of texture unit 0. They are based at registers 0x0091 and 0x0099.
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| {| class="wikitable" border="1"
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| ! Index word
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| ! Description
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| |-
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| | 0-4
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| | Same as for texture unit 0
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| |-
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| | 5
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| | Texture format (see below)
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| |}
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| == Configuration of texture unit 3 ==
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| The configuration block for texture unit 3 seems to be vastly different from the other texture units. Instead, registers 0x00A8 through 0x00B7 are used to configure procedural texturing features.
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| == Texture info parameter structure for commands 0x0091 and 0x0099 ==
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| {| class="wikitable" border="1"
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| ! Index Word
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| ! Description
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| |-
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| | 4-0
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| | Same as command 0x0081.
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| |-
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| | 5
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| | Color type
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| |}
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| == Texture parameters ==
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| {| class="wikitable" border="1"
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| ! Bit
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| ! Description
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| ! GL parameter name
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| |-
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| | 0
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| | Normally this is value 0.
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| |-
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| | 1
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| | 0 = GL_NEAREST, 1 = GL_LINEAR.
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| | GL_TEXTURE_MAG_FILTER
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| |-
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| | 2
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| | 1 = GL_LINEAR, GL_LINEAR_MIPMAP_NEAREST, or GL_LINEAR_MIPMAP_LINEAR. Value zero otherwise.
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| | GL_TEXTURE_MIN_FILTER
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| |-
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| | 3
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| | Unused?
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| | ?
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| |-
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| | 5-4
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| | 2 = texture color type 0xC, 0 otherwise.(Enable/disable texture data compression?) 0 = unknown, 1 = unknown, 3 = same effect as value 2.
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| |-
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| | 7-6
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| | Unused
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| |-
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| | 11-8
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| | 0 = GL_CLAMP_TO_EDGE, 1=unknown, 2=GL_REPEAT, 3=unknown.
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| | GL_TEXTURE_WRAP_S
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| |-
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| | 15-12
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| | Same values as GL_TEXTURE_WRAP_S.
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| | GL_TEXTURE_WRAP_T
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| |-
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| | 24
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| | 1 = GL_NEAREST_MIPMAP_LINEAR, or GL_LINEAR_MIPMAP_LINEAR. Value zero otherwise.
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| | GL_TEXTURE_MIN_FILTER
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| |-
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| | 27-25
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| | Unused?
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| |-
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| | 30-28
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| | When some flag=1: value1=GL_TEXTURE_2D, value0 when the input parameter is not GL_TEXTURE_2D. When some flag=0: 0=GL_TEXTURE_2D, 1-4=unknown.
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| | ?
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| |-
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| | 31
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| | Unused?
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| | ?
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| |}
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| == Texture color types ==
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| {| class="wikitable" border="1"
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| ! Value
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| ! Description
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| ! GL Format
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| ! GL Data Type
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| |-
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| | 0x0
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| | RGBA8888
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| | GL_RGBA / DMP-extension constant 0x6752
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| | GL_UNSIGNED_BYTE
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| |-
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| | 0x1
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| | BGR888
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| | GL_RGB / DMP-extension constant 0x6754
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| | GL_UNSIGNED_BYTE
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| |-
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| | 0x2
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| | RGBA5551
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| | GL_RGBA / DMP-extension constant 0x6752
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| | GL_UNSIGNED_SHORT_5_5_5_1
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| |-
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| | 0x3
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| | BGR565
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| | GL_RGB / DMP-extension constant 0x6754
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| | GL_UNSIGNED_SHORT_5_6_5
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| |-
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| | 0x4
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| | RGBA4444
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| | GL_RGBA / DMP-extension constant 0x6752
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| | GL_UNSIGNED_SHORT_4_4_4_4
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| |-
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| | 0x5
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| | Tiled RGB565
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| | GL_LUMINANCE_ALPHA(?) / DMP-extension constant 0x6758(?)
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| | GL_UNSIGNED_BYTE(?)
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| |-
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| | 0x6
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| | Tiled BGR888
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| | DMP-extension constants 0x6700 / 0x6759
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| | GL_UNSIGNED_BYTE
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| |-
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| | 0x7
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| | GL_LUMINANCE / DMP-extension constant 0x6757
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| | GL_UNSIGNED_BYTE
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| |-
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| | 0x8
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| | GL_ALPHA / DMP-extension constant 0x6756
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| | GL_UNSIGNED_BYTE
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| |-
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| | 0x9
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| | ?
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| | GL_LUMINANCE_ALPHA / DMP-extension constant 0x6758
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| | DMP-extension constant 0x6760
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| |-
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| | 0xA
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| | ?
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| | GL_LUMINANCE / DMP-extension constant 0x6757
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| | DMP-extension constant 0x6761
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| |-
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| | 0xB
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| | ?
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| | GL_ALPHA / DMP-extension constant 0x6756
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| | DMP-extension constant 0x6761
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| |-
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| | 0xC
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| | Compression related?
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| | DMP-extension constant 0x675A
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| |-
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| | 0xD
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| | ?
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| | DMP-extension constant 0x675B
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| |}
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This page is obsolete, see here for GPU register information, including that of textures.