NV2A/Pixel Combiner

The NV2A implements NV_register_combiners (and NV_register_combiners2?)

Texturing modes

ID	Name	Stage 1	Stage 2	Stage 3	Stage 4	Notes
0x00	PS_TEXTUREMODES_NONE texcoord?[citation needed]	*	*	*	*
0x01	PS_TEXTUREMODES_PROJECT2D tex	*	*	*	*
0x02	PS_TEXTUREMODES_PROJECT3D	*	*	*	*
0x03	PS_TEXTUREMODES_CUBEMAP	*	*	*	*
0x04	PS_TEXTUREMODES_PASSTHRU texcoord?[citation needed]	*	*	*	*
0x05	PS_TEXTUREMODES_CLIPPLANE texkill	*	*	*	*
0x06	PS_TEXTUREMODES_BUMPENVMAP texbem		*	*	*
0x07	PS_TEXTUREMODES_BUMPENVMAP_LUM texbeml		*	*	*
0x08	PS_TEXTUREMODES_BRDF texm3x2tex			*	*
0x09	PS_TEXTUREMODES_DOT_ST texm3x2pad?[citation needed]			*	*
0x0A	PS_TEXTUREMODES_DOT_ZW texm3x2tex?[citation needed]			*	*
0x0B	PS_TEXTUREMODES_DOT_RFLCT_DIFF			*
0x0C	PS_TEXTUREMODES_DOT_RFLCT_SPEC				*
0x0D	PS_TEXTUREMODES_DOT_STR_3D				*
0x0E	PS_TEXTUREMODES_DOT_STR_CUBE				*
0x0F	PS_TEXTUREMODES_DPNDNT_AR texreg2ar		*	*	*
0x10	PS_TEXTUREMODES_DPNDNT_GB texreg2gb		*	*	*
0x11	PS_TEXTUREMODES_DOTPRODUCT		*	*
0x12	PS_TEXTUREMODES_DOT_RFLCT_SPEC_CONST				*

Also known from nvidia docs:

• texm3x3pad [stage 1, stage 2]
• texm3x3spec [stage 3]
• texm3x3vspec [stage 3]
• texm3x3tex [stage 3]

Debugging

PIX from the Microsoft XDK provides great debugging capabilities.

References and links

• http://developer.download.nvidia.com/assets/gamedev/docs/GDC2K1_DX8_Pixel_Shaders.pdf
• http://developer.download.nvidia.com/assets/gamedev/docs/ProgrammableTextureBlending.pdf