Extended texture format of Direct3D9

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In WINXP, even if the GPU supports d3d10 +, you can only use the d3d9 API. But in fact, various manufacturers have made some extensions to d3d9, and some d3d10 + features are exposed to the d3d9 API. The following are some special texture formats that can be used by fourcc. Checkdeviceformat can be used to check whether the format is supported. You can pass it in when createtexture is used. The source of the table below is the GPU documentation of various vendors, which is organized by unity Aras:

Usage column: DS = depthstencer, rT = rendertarget; resource column: Tex = texture, surf = surface. The more hardware is supported.

Format	Usage	Resource	Description	NVIDIA geforce	ATI radeon	Intel
Shadow Mapping
D3dfmt_d16	DS	Tex	Sample depth buffer directly as shadow map.	3 +	HD 2xxx +	965 +
D3dfmt_d24x8	DS	Tex		3 +	HD 2xxx +	965 +
Depth buffer as texture
Df16	DS	Tex	Read depth buffer as texture.		9500 +	G45 +
Df24	DS	Tex			X1300 +
Intz	DS	Tex		8 +	HD 4xxx +	G45 +
Rawz	DS	Tex		6 & 7
Anti-aliasing related
Resz	RT	Surf	Resolve msaa 'd depth stencel surface into non-msaa 'd depth texture.		HD 4xxx +	G45 +
ATOC	0	Surf	Transparency anti-aliasing.	7 +
Ssaa	0	Surf		7 +
All ATI sm2.0 + hardware					9500 +
N/			Coverage sampled anti-aliasing	8 +
Texturing
Ati1	0	Tex	Ati1n & ati2n texture compression formats.	8 +	X1300 +	G45 +
Ati2	0	Tex		6 +	9500 +	G45 +
Df24	DS	Tex	Fetch 4: when sampling 1 channel texture, return four touched Texel values. Check for df24 support.		X1300 +
Misc
Null	RT	Surf	Dummy render target surface that does not consume video memory.	6 +	HD 4xxx +
Nvdb	0	Surf	Depth Bounds Test.	6 +
R2vb	0	Surf	Render into vertex buffer.	6 & 7	9500 +
Inst	0	Surf	Geometry instancing on pre-SM3.0 hardware.		9500 +

For more information about GPU extensions, see:

• Nvidia gpu programming guide
• Advanced DX9 capabilities for ATI radeon cards-whitepaper (July 2009)