GPU Textures

This page describes the GPU commands used for textures.

Command set 0x809F0081

Command Index	CommandID	Parameter	Description
0	0x809F0081		This is used to set the current texture info used for rendering.
1	0x000F008E	u32 color type	This sets the current texture color type.

Textures are initially disabled when beginning rendering for each mesh, this command set enables textures.

Texture info parameter structure for CmdID 0x809F0081

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 data physical address >> 3. This is normally located in VRAM.
5-9	?

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?	?
7-4	2 = texture color type 0xC, 0 otherwise.(Enable/disable texture data compression?)
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 type parameter values for CmdID 0x000F008E

Value	Description	GL Format	GL Data Type
0x0	RGBA8888	GL_RGBA	GL_UNSIGNED_BYTE
0x1	BGR888	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		GL_LUMINANCE_ALPHA	GL_UNSIGNED_BYTE
0x6	?	?	GL_UNSIGNED_BYTE
0x7		GL_LUMINANCE	GL_UNSIGNED_BYTE
0x8		GL_ALPHA	GL_UNSIGNED_BYTE
0x9	?	GL_LUMINANCE_ALPHA	?
0xA	?	GL_LUMINANCE
0xB	?	GL_ALPHA
0xC	Compression related?	?
0xD	?	?