NV2A/Pixel Combiner

The NV2A implements NV_register_combiners (and NV_register_combiners2?)

Texturing modes

ID	Name	GL Name	Stage 1	Stage 2	Stage 3	Stage 4	Notes
0x00	PS_TEXTUREMODES_NONE texcoord?[citation needed]	NONE	✔	✔	✔	✔
0x01	PS_TEXTUREMODES_PROJECT2D tex	TEXTURE_2D	✔	✔	✔	✔
0x02	PS_TEXTUREMODES_PROJECT3D	TEXTURE_3D	✔	✔	✔	✔
0x03	PS_TEXTUREMODES_CUBEMAP	TEXTURE_CUBE_MAP_ARB	✔	✔	✔	✔
0x04	PS_TEXTUREMODES_PASSTHRU texcoord?[citation needed]	PASS_THROUGH_NV	✔	✔	✔	✔
0x05	PS_TEXTUREMODES_CLIPPLANE texkill	CULL_FRAGMENT_NV	✔	✔	✔	✔
0x06	PS_TEXTUREMODES_BUMPENVMAP texbem	OFFSET_TEXTURE_2D_NV	✗	✔	✔	✔
0x07	PS_TEXTUREMODES_BUMPENVMAP_LUM texbeml	OFFSET_TEXTURE_2D_SCALE_NV	✗	✔	✔	✔
0x08	PS_TEXTUREMODES_BRDF texm3x2tex		✗	✗	✔	✔
0x09	PS_TEXTUREMODES_DOT_ST texm3x2pad?[citation needed]	DOT_PRODUCT_NV[citation needed]	✗	✗	✔	✔
0x0A	PS_TEXTUREMODES_DOT_ZW texm3x2tex?[citation needed]	DOT_PRODUCT_NV[citation needed]	✗	✗	✔	✔
0x0B	PS_TEXTUREMODES_DOT_RFLCT_DIFF	DOT_PRODUCT_DIFFUSE_CUBE_MAP_NV[citation needed]	✗	✗	✔	✗
0x0C	PS_TEXTUREMODES_DOT_RFLCT_SPEC	DOT_PRODUCT_CONST_EYE_REFLECT_CUBE_MAP_NV[citation needed]	✗	✗	✗	✔
0x0D	PS_TEXTUREMODES_DOT_STR_3D	DOT_PRODUCT_TEXTURE_3D_NV	✗	✗	✗	✔
0x0E	PS_TEXTUREMODES_DOT_STR_CUBE	DOT_PRODUCT_REFLECT_CUBE_MAP_NV	✗	✗	✗	✔
0x0F	PS_TEXTUREMODES_DPNDNT_AR texreg2ar	DEPENDENT_AR_TEXTURE_2D_NV	✗	✔	✔	✔
0x10	PS_TEXTUREMODES_DPNDNT_GB texreg2gb	DEPENDENT_GB_TEXTURE_2D_NV	✗	✔	✔	✔
0x11	PS_TEXTUREMODES_DOTPRODUCT	DOT_PRODUCT_NV	✗	✔	✔	✗
0x12	PS_TEXTUREMODES_DOT_RFLCT_SPEC_CONST	DOT_PRODUCT_CONST_EYE_REFLECT_CUBE_MAP_NV	✗	✗	✗	✔	✗

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