Difference between revisions of "GPU Textures"

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(Mention z-order curves.)
m (Replaced content with "This page is obsolete, see here for GPU register information, including that of textures.")
 
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This page describes the [[GPU_Commands|GPU commands]] used for textures.
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This page is obsolete, see [[GPU/Internal_Registers|here]] for GPU register information, including that of textures.
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== General information ==
 
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Individual texels in a texture are laid out in memory as a [http://en.wikipedia.org/wiki/Z-order_curve Z-order curve].
 
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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 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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|-
 
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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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|-
 
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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
 
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| GL_UNSIGNED_BYTE
 
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|-
 
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| 0x1
 
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| RGB888
 
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| GL_RGB
 
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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
 
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| GL_UNSIGNED_SHORT_5_5_5_1
 
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|-
 
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| 0x3
 
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| RGB565
 
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| GL_RGB
 
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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
 
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| GL_UNSIGNED_SHORT_4_4_4_4
 
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|-
 
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| 0x5
 
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| IA8
 
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| GL_LUMINANCE_ALPHA
 
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| GL_UNSIGNED_BYTE
 
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|-
 
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| 0x6
 
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|
 
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|
 
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|
 
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|-
 
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| 0x7
 
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| I8
 
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| GL_LUMINANCE
 
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| GL_UNSIGNED_BYTE
 
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|-
 
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| 0x8
 
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| A8
 
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| GL_ALPHA
 
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| GL_UNSIGNED_BYTE
 
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|-
 
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| 0x9
 
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| IA44
 
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| GL_LUMINANCE_ALPHA
 
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| GL_UNSIGNED_BYTE_4_4_EXT
 
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|-
 
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| 0xA
 
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|
 
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|
 
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|
 
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|-
 
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| 0xB
 
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| A4
 
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| GL_ALPHA
 
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| GL_UNSIGNED_NIBBLE_EXT
 
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|-
 
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| 0xC
 
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| ETC1
 
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| GL_ETC1_RGB8_OES
 
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|
 
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|-
 
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| 0xD
 
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| ETC1A4
 
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|
 
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|
 
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|}
 

Latest revision as of 05:34, 5 December 2015

This page is obsolete, see here for GPU register information, including that of textures.

Retrieved from "https://www.3dbrew.org/w/index.php?title=GPU_Textures&oldid=14844"