public Shader(int startLine, ProgramPipelineParameter shaderType)
{
LineInFile = startLine;
ShaderType = shaderType;
gl_MaxClipDistances = GL.GetInteger(GetPName.MaxClipDistances);
}
protected static object GetUniform(string uniformName, Type uniformType, ProgramPipelineParameter shader)
{
int size;
var locations = new int[1];
// get current shader program pipeline
var pipeline = GL.GetInteger(GetPName.ProgramPipelineBinding);
if (pipeline <= 0)
{
return(DebugGetError(uniformType, new StackTrace(true)));
}
// get vertex shader
GL.GetProgramPipeline(pipeline, shader, out int program);
if (program <= 0)
{
return(DebugGetError(uniformType, new StackTrace(true)));
}
// get uniform buffer object block index
int block = GL.GetUniformBlockIndex(program, uniformName.Substring(0, uniformName.IndexOf('.')));
if (block < 0)
{
return(DebugGetError(uniformType, new StackTrace(true)));
}
// get bound buffer object
GL.GetActiveUniformBlock(program, block, ActiveUniformBlockParameter.UniformBlockBinding, out int unit);
GL.GetInteger(GetIndexedPName.UniformBufferBinding, unit, out int glbuf);
if (glbuf <= 0)
{
return(DebugGetError(uniformType, new StackTrace(true)));
}
// get uniform indices in uniform block
GL.GetUniformIndices(program, 1, new[] { uniformName }, locations);
var location = locations[0];
if (location < 0)
{
return(DebugGetError(uniformType, new StackTrace(true)));
}
// get uniform information
GL.GetActiveUniforms(program, 1, ref location, ActiveUniformParameter.UniformType, out int type);
GL.GetActiveUniforms(program, 1, ref location, ActiveUniformParameter.UniformSize, out int length);
GL.GetActiveUniforms(program, 1, ref location, ActiveUniformParameter.UniformOffset, out int offset);
GL.GetActiveUniforms(program, 1, ref location, ActiveUniformParameter.UniformArrayStride, out int stride);
// get size of the uniform type
switch ((All)type)
{
case All.IntVec2:
case All.UnsignedIntVec2:
case All.FloatVec2:
case All.Double:
size = 8;
break;
case All.IntVec3:
case All.UnsignedIntVec3:
case All.FloatVec3:
size = 12;
break;
case All.IntVec4:
case All.UnsignedIntVec4:
case All.FloatVec4:
case All.DoubleVec2:
case All.FloatMat2:
size = 16;
break;
case All.DoubleVec3:
size = 24;
break;
case All.DoubleVec4:
size = 32;
break;
case All.FloatMat3:
size = 36;
break;
case All.FloatMat4:
size = 64;
break;
default:
size = 4;
break;
}
// read uniform buffer data
var array = new byte[Math.Max(stride, size) * length];
var src = GL.MapNamedBufferRange(glbuf, (IntPtr)offset, array.Length, BufferAccessMask.MapReadBit);
Marshal.Copy(src, array, 0, array.Length);
GL.UnmapNamedBuffer(glbuf);
DebugGetError(new StackTrace(true));
// if the return type is an array
if (uniformType.IsArray && BaseTypes.Any(x => x == uniformType.GetElementType()))
{
return(array.To(uniformType.GetElementType()));
}
// if the return type is a base type
if (BaseTypes.Any(x => x == uniformType))
{
return(array.To(uniformType).GetValue(0));
}
// create new object from byte array
return(uniformType.GetConstructor(new[] { typeof(byte[]) })?.Invoke(new[] { array }));
}