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GeometryShaderGen: Add comments.

This commit is contained in:
Jules Blok 2014-11-12 00:40:58 +01:00
parent a565317a6a
commit 422125c1a9
1 changed files with 10 additions and 0 deletions
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10
Source/Core/VideoCommon/GeometryShaderGen.cpp
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@ -71,11 +71,14 @@ static inline void GenerateGeometryShader(T& out, u32 components, API_TYPE ApiTy
out.Write("void main()\n{\n"); out.Write("void main()\n{\n");
// If the GPU supports invocation we don't need a for loop and can simply use the
// invocation identifier to determine which layer we're rendering.
if (g_ActiveConfig.backend_info.bSupportsGSInstancing) if (g_ActiveConfig.backend_info.bSupportsGSInstancing)
out.Write("\tlayer = gl_InvocationID;\n"); out.Write("\tlayer = gl_InvocationID;\n");
else else
out.Write("\tfor (layer = 0; layer < %d; ++layer) {\n", g_ActiveConfig.iStereoMode > 0 ? 2 : 1); out.Write("\tfor (layer = 0; layer < %d; ++layer) {\n", g_ActiveConfig.iStereoMode > 0 ? 2 : 1);
// Select the output layer
out.Write("\tgl_Layer = layer;\n"); out.Write("\tgl_Layer = layer;\n");
out.Write("\tfor (int i = 0; i < gl_in.length(); ++i) {\n"); out.Write("\tfor (int i = 0; i < gl_in.length(); ++i) {\n");
@ -83,6 +86,13 @@ static inline void GenerateGeometryShader(T& out, u32 components, API_TYPE ApiTy
if (g_ActiveConfig.iStereoMode > 0) if (g_ActiveConfig.iStereoMode > 0)
{ {
// For stereoscopy add a small horizontal offset in Normalized Device Coordinates proportional
// to the depth of the vertex. We retrieve the depth value from the w-component of the projected
// vertex which contains the negated z-component of the original vertex.
// For negative parallax (out-of-screen effects) we subtract a convergence value from
// the depth value. This results in objects at a distance smaller than the convergence
// distance to seemingly appear in front of the screen.
// This formula is based on page 13 of the "Nvidia 3D Vision Automatic, Best Practices Guide"
out.Write("\t\tf.clipPos.x += " I_STEREOPARAMS"[layer] * (f.clipPos.w - " I_STEREOPARAMS"[2]);\n"); out.Write("\t\tf.clipPos.x += " I_STEREOPARAMS"[layer] * (f.clipPos.w - " I_STEREOPARAMS"[2]);\n");
out.Write("\t\tf.pos.x += " I_STEREOPARAMS"[layer] * (f.pos.w - " I_STEREOPARAMS"[2]);\n"); out.Write("\t\tf.pos.x += " I_STEREOPARAMS"[layer] * (f.pos.w - " I_STEREOPARAMS"[2]);\n");
} }