void INativeShaderPart.LoadSource(string sourceCode, Resources.ShaderType type)
{
}
void INativeShaderProgram.LoadProgram(IEnumerable <INativeShaderPart> shaderParts, IEnumerable <ShaderFieldInfo> shaderFields)
{
DefaultOpenTKBackendPlugin.GuardSingleThreadState();
// Verify that we have exactly one shader part for each stage.
// Other scenarios are valid in desktop GL, but not GL ES, so
// we'll enforce the stricter rules manually to ease portability.
int vertexCount = 0;
int fragmentCount = 0;
foreach (INativeShaderPart part in shaderParts)
{
Resources.ShaderType type = (part as NativeShaderPart).Type;
if (type == Resources.ShaderType.Fragment)
{
fragmentCount++;
}
else if (type == Resources.ShaderType.Vertex)
{
vertexCount++;
}
}
if (vertexCount == 0)
{
throw new ArgumentException("Cannot load program without vertex shader.");
}
if (fragmentCount == 0)
{
throw new ArgumentException("Cannot load program without fragment shader.");
}
if (vertexCount > 1)
{
throw new ArgumentException("Cannot attach multiple vertex shaders to the same program.");
}
if (fragmentCount > 1)
{
throw new ArgumentException("Cannot attach multiple fragment shaders to the same program.");
}
// Create or reset GL program
if (this.handle == 0)
{
this.handle = GL.CreateProgram();
}
else
{
this.DetachShaders();
}
// Attach all individual shaders to the program
foreach (INativeShaderPart part in shaderParts)
{
GL.AttachShader(this.handle, (part as NativeShaderPart).Handle);
}
// Link the shader program
GL.LinkProgram(this.handle);
int result;
GL.GetProgram(this.handle, GetProgramParameterName.LinkStatus, out result);
if (result == 0)
{
string errorLog = GL.GetProgramInfoLog(this.handle);
this.RollbackAtFault();
throw new BackendException(string.Format("Linker error:{1}{0}", errorLog, Environment.NewLine));
}
// Collect variables that are available through shader reflection, e.g.
// haven't been optimized of #ifdef'd away.
List <int> validLocations = new List <int>();
List <ShaderFieldInfo> validFields = new List <ShaderFieldInfo>();
foreach (ShaderFieldInfo field in shaderFields)
{
int location;
if (field.Scope == ShaderFieldScope.Uniform)
{
location = GL.GetUniformLocation(this.handle, field.Name);
}
else
{
location = GL.GetAttribLocation(this.handle, field.Name);
}
if (location >= 0)
{
validLocations.Add(location);
validFields.Add(field);
}
}
this.fields = validFields.ToArray();
this.fieldLocations = validLocations.ToArray();
}
