GPU Textures

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This page describes the GPU commands used for textures.

Command set 0x0081

Command Index CommandID Parameter Description
0 0x0081 This is used to set the current texture info used for rendering.
1 0x008E u32 color type This sets the current texture color type.

Textures are initially disabled when beginning rendering for each mesh, this command set also enables textures. This command set is used for index0, commands 0x0091 and 0x0099 are used for index1-index2.

Texture info parameter structure for command 0x0081

Index Word Description
0 ?
1 The low u16 is the texture image width, and the high u16 is the texture image height.
2 Texture parameters, initialized by glTexParameter().
3 ?
4 Texture image data physical address >> 3.
5-9 Value zero

Texture info parameter structure for commands 0x0091 and 0x0099

Index Word Description
4-0 Same as command 0x0081.
5 Color type

Texture parameters

Bit Description GL parameter name
0 Normally this is value 0.
1 0 = GL_NEAREST, 1 = GL_LINEAR. GL_TEXTURE_MAG_FILTER
2 1 = GL_LINEAR, GL_LINEAR_MIPMAP_NEAREST, or GL_LINEAR_MIPMAP_LINEAR. Value zero otherwise. GL_TEXTURE_MIN_FILTER
3 Unused? ?
5-4 2 = texture color type 0xC, 0 otherwise.(Enable/disable texture data compression?) 0 = unknown, 1 = unknown, 3 = same effect as value 2.
7-6 Unused
11-8 0 = GL_CLAMP_TO_EDGE, 1=unknown, 2=GL_REPEAT, 3=unknown. GL_TEXTURE_WRAP_S
15-12 Same values as GL_TEXTURE_WRAP_S. GL_TEXTURE_WRAP_T
24 1 = GL_NEAREST_MIPMAP_LINEAR, or GL_LINEAR_MIPMAP_LINEAR. Value zero otherwise. GL_TEXTURE_MIN_FILTER
27-25 Unused?
30-28 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. ?
31 Unused? ?

Texture color types

Value Description GL Format GL Data Type
0x0 RGBA8888 GL_RGBA / DMP-extension constant 0x6752 GL_UNSIGNED_BYTE
0x1 BGR888 GL_RGB / DMP-extension constant 0x6754 GL_UNSIGNED_BYTE
0x2 RGBA5551 GL_RGBA / DMP-extension constant 0x6752 GL_UNSIGNED_SHORT_5_5_5_1
0x3 BGR565 GL_RGB / DMP-extension constant 0x6754 GL_UNSIGNED_SHORT_5_6_5
0x4 RGBA4444 GL_RGBA / DMP-extension constant 0x6752 GL_UNSIGNED_SHORT_4_4_4_4
0x5 Tiled RGB565 GL_LUMINANCE_ALPHA(?) / DMP-extension constant 0x6758(?) GL_UNSIGNED_BYTE(?)
0x6 ? DMP-extension constants 0x6700 / 0x6759 GL_UNSIGNED_BYTE
0x7 GL_LUMINANCE / DMP-extension constant 0x6757 GL_UNSIGNED_BYTE
0x8 GL_ALPHA / DMP-extension constant 0x6756 GL_UNSIGNED_BYTE
0x9 ? GL_LUMINANCE_ALPHA / DMP-extension constant 0x6758 DMP-extension constant 0x6760
0xA ? GL_LUMINANCE / DMP-extension constant 0x6757 DMP-extension constant 0x6761
0xB ? GL_ALPHA / DMP-extension constant 0x6756 DMP-extension constant 0x6761
0xC Compression related? DMP-extension constant 0x675A
0xD ? DMP-extension constant 0x675B