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GeometryShader: Transform the projection within the geometry shader.

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Reduces the amount of data transferred through uniforms.
The shearing transformation is reduced to a single multiplication/addition for optimization.
This commit is contained in:
Jules Blok
2014-10-30 02:08:15 +01:00
parent 4fd943aedd
commit 6cacfad010
4 changed files with 14 additions and 24 deletions
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12
Source/Core/VideoCommon/GeometryShaderGen.cpp
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@ -70,16 +70,18 @@ static inline void GenerateGeometryShader(T& out, u32 components, API_TYPE ApiTy
out.Write("flat out int layer;\n");
out.Write("void main()\n{\n");
if (!g_ActiveConfig.backend_info.bSupportsGSInstancing)
if (g_ActiveConfig.backend_info.bSupportsGSInstancing)
out.Write("\tlayer = gl_InvocationID;\n");
else
out.Write("\tfor (layer = 0; layer < %d; ++layer) {\n", g_ActiveConfig.bStereo ? 2 : 1);
out.Write("\tgl_Layer = layer;\n");
out.Write("\tvec4 stereoproj = "I_PROJECTION"[0];\n");
out.Write("\tstereoproj[2] += "I_STEREOOFFSET"[layer] * stereoproj[0];\n");
out.Write("\tfor (int i = 0; i < gl_in.length(); ++i) {\n");
out.Write("\t\to = v[i];\n");
if (g_ActiveConfig.backend_info.bSupportsGSInstancing)
out.Write("\t\tlayer = gl_InvocationID;\n");
if (g_ActiveConfig.bStereo)
out.Write("\t\to.pos = float4(dot(" I_STEREOPROJECTION"[layer * 4 + 0], v[i].rawpos), dot(" I_STEREOPROJECTION"[layer * 4 + 1], v[i].rawpos), dot(" I_STEREOPROJECTION"[layer * 4 + 2], v[i].rawpos), dot(" I_STEREOPROJECTION"[layer * 4 + 3], v[i].rawpos)); \n");
out.Write("\t\to.pos = float4(dot(stereoproj, v[i].rawpos), dot(" I_PROJECTION"[1], v[i].rawpos), dot(" I_PROJECTION"[2], v[i].rawpos), dot(" I_PROJECTION"[3], v[i].rawpos)); \n");
out.Write("\t\tgl_Position = o.pos;\n");
out.Write("\t\tgl_Layer = layer;\n");
out.Write("\t\tEmitVertex();\n");
out.Write("\t}\n");
out.Write("\tEndPrimitive();\n");