private void SubroutineUniformIndexChanged(SubroutineUniform uniform)
{
switch (uniform.ShaderType)
{
case ShaderType.VertexShader:
_subroutineVertexStage[uniform.Location] = uniform.SubroutineIndex;
break;
case ShaderType.FragmentShader:
_subroutineFragmentStage[uniform.Location] = uniform.SubroutineIndex;
break;
case ShaderType.GeometryShader:
_subroutineGeometryStage[uniform.Location] = uniform.SubroutineIndex;
break;
default:
throw new NotSupportedException(uniform.ShaderType.ToString());
}
}
private void InitSubroutines(uint handle, ShaderType shaderType)
{
if (shaderType == ShaderType.ComputeShader)
{
throw new NotSupportedException(ShaderType.ComputeShader.ToString());
}
var activeSubroutineUniformLocations = Context.GetProgramStage(handle, shaderType, ShaderSubroutine.ActiveSubroutineUniformLocations);
var activeSubroutineUniformsCount = Context.GetProgramStage(handle, shaderType, ShaderSubroutine.ActiveSubroutineUniforms);
Assert.True(activeSubroutineUniformLocations == activeSubroutineUniformsCount);
if (activeSubroutineUniformsCount == 0)
{
return;
}
switch (shaderType)
{
case ShaderType.VertexShader:
Assert.Null(_subroutineVertexStage);
_subroutineVertexStage = new uint[activeSubroutineUniformLocations];
break;
case ShaderType.FragmentShader:
Assert.Null(_subroutineFragmentStage);
_subroutineFragmentStage = new uint[activeSubroutineUniformLocations];
break;
case ShaderType.GeometryShader:
Assert.Null(_subroutineGeometryStage);
_subroutineGeometryStage = new uint[activeSubroutineUniformLocations];
break;
default:
throw new NotSupportedException(shaderType.ToString());
}
for (uint i = 0; i < activeSubroutineUniformsCount; i++)
{
var uniformName = Context.GetActiveSubroutineUniformName(handle, shaderType, i);
var uniformLocation = Context.GetSubroutineUniformLocation(handle, shaderType, uniformName);
var uniform = new SubroutineUniform(uniformName, uniformLocation, shaderType);
uniform.SubroutineUniformIndexChanged += SubroutineUniformIndexChanged;
_subroutineUniforms.Add(uniform);
var compatibleCount = Context.GetActiveSubroutineUniform(handle, shaderType, i, ShaderSubroutine.NumCompatibleSubroutines);
var indexes = new int[compatibleCount];
Context.GetActiveSubroutineUniform(handle, shaderType, i, ShaderSubroutine.CompatibleSubroutines, indexes);
for (uint j = 0; j < compatibleCount; j++)
{
var subroutineName = Context.GetActiveSubroutineName(handle, shaderType, j);
var subroutineIndex = Context.GetSubroutineIndex(handle, shaderType, subroutineName);
Assert.True(subroutineIndex == j);
uniform.AddSubroutine(subroutineName, subroutineIndex);
}
}
}
