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Shaders: Implemented the gl_FrontFacing input attribute (attr 63).

This commit is contained in:
Subv 2018-08-19 00:14:34 -05:00
parent 6eba539f4a
commit 731701a2d2
2 changed files with 7 additions and 0 deletions
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3
src/video_core/engines/shader_bytecode.h
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@ -79,6 +79,9 @@ union Attribute {
// shader, and a tuple of (TessCoord.x, TessCoord.y, TessCoord.z, ~) when inside a Tess Eval
// shader.
TessCoordInstanceIDVertexID = 47,
// This attribute contains a tuple of (Unk, Unk, Unk, gl_FrontFacing) when inside a fragment
// shader. It is unknown what the other values contain.
FrontFacing = 63,
};
union {

4
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -542,6 +542,10 @@ private:
// shader.
ASSERT(stage == Maxwell3D::Regs::ShaderStage::Vertex);
return "vec4(0, 0, uintBitsToFloat(instance_id.x), uintBitsToFloat(gl_VertexID))";
case Attribute::Index::FrontFacing:
// TODO(Subv): Find out what the values are for the other elements.
ASSERT(stage == Maxwell3D::Regs::ShaderStage::Fragment);
return "vec4(0, 0, 0, uintBitsToFloat(gl_FrontFacing ? 1 : 0))";
default:
const u32 index{static_cast<u32>(attribute) -
static_cast<u32>(Attribute::Index::Attribute_0)};