void VaryingPacking::enableBuiltins(ShaderType shaderType,
const ProgramD3DMetadata &programMetadata)
{
int majorShaderModel = programMetadata.getRendererMajorShaderModel();
bool position = programMetadata.usesTransformFeedbackGLPosition();
bool fragCoord = programMetadata.usesFragCoord();
bool pointCoord = shaderType == SHADER_VERTEX ? programMetadata.addsPointCoordToVertexShader()
: programMetadata.usesPointCoord();
bool pointSize = programMetadata.usesSystemValuePointSize();
bool hlsl4 = (majorShaderModel >= 4);
const std::string &userSemantic = GetVaryingSemantic(majorShaderModel, pointSize);
unsigned int reservedSemanticIndex = getMaxSemanticIndex();
BuiltinInfo *builtins = &mBuiltinInfo[shaderType];
if (hlsl4)
{
builtins->dxPosition.enableSystem("SV_Position");
}
else if (shaderType == SHADER_PIXEL)
{
builtins->dxPosition.enableSystem("VPOS");
}
else
{
builtins->dxPosition.enableSystem("POSITION");
}
if (position)
{
builtins->glPosition.enable(userSemantic, reservedSemanticIndex++);
}
if (fragCoord)
{
builtins->glFragCoord.enable(userSemantic, reservedSemanticIndex++);
}
if (pointCoord)
{
// SM3 reserves the TEXCOORD semantic for point sprite texcoords (gl_PointCoord)
// In D3D11 we manually compute gl_PointCoord in the GS.
if (hlsl4)
{
builtins->glPointCoord.enable(userSemantic, reservedSemanticIndex++);
}
else
{
builtins->glPointCoord.enable("TEXCOORD", 0);
}
}
// Special case: do not include PSIZE semantic in HLSL 3 pixel shaders
if (pointSize && (shaderType != SHADER_PIXEL || hlsl4))
{
builtins->glPointSize.enableSystem("PSIZE");
}
}
