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https://github.com/KhronosGroup/glslang
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194f0f39ec
SPIR-V requires that tessellation factor arrays be size 4 (outer) or 2 (inner). HLSL allows other sizes such as 3, or even scalars. This commit converts between them by forcing the IO types to be the SPIR-V size, and allowing copies between the internal and IO types to handle these cases.
44 lines
883 B
GLSL
44 lines
883 B
GLSL
// ***
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// per-control-point invocation of PCF from entry point return value
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// ***
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struct hs_in_t
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{
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float3 val : TEXCOORD0;
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};
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struct hs_pcf_t
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{
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float tfactor[3] : SV_TessFactor; // must turn into a size 4 array in SPIR-V
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float flInFactor : SV_InsideTessFactor; // must turn into a size 2 array in SPIR-V
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};
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struct hs_out_t
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{
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float3 val : TEXCOORD0;
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};
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[ domain ("tri") ]
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[ partitioning ("fractional_odd") ]
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[ outputtopology ("triangle_cw") ]
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[ outputcontrolpoints (3) ]
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[ patchconstantfunc ( "PCF" ) ]
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hs_out_t main (InputPatch <hs_in_t, 3> i , uint cpid : SV_OutputControlPointID)
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{
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hs_out_t o;
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o.val = cpid;
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return o;
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}
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hs_pcf_t PCF( const OutputPatch <hs_out_t, 3> pcf_out)
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{
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hs_pcf_t o;
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o.tfactor[0] = pcf_out[0].val.x;
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o.tfactor[1] = pcf_out[1].val.x;
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o.tfactor[2] = pcf_out[2].val.x;
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o.flInFactor = 4;
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return o;
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}
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