public IShaderProgram Program(ShaderProgramDescription description)
{
ShaderProgram result;
string errors;
if (!ShaderProgram.TryLink(context, description, out result, out errors))
{
throw new ShaderException("Failed to link a shader prgram:\r\n\r\n" + errors);
}
return(result);
}
public static unsafe bool TryLink(
IContext context,
ShaderProgramDescription description,
out ShaderProgram program,
out string errors)
{
var gl = context.GL;
description.VertexAttributeNames = description.VertexAttributeNames ?? EmptyStringArray;
if (description.VertexAttributeNames.Any(x => x != null && description.VertexAttributeNames.Count(y => y == x) != 1))
{
throw new ArgumentException("All non-null attribute names must be unique.");
}
description.UniformBufferNames = description.UniformBufferNames ?? EmptyStringArray;
if (description.UniformBufferNames.Any(x => x != null && description.UniformBufferNames.Count(y => y == x) != 1))
{
throw new ArgumentException("All non-null uniform buffer names must be unique.");
}
description.TransformFeedbackAttributeNames = description.TransformFeedbackAttributeNames ?? EmptyStringArray;
if (description.TransformFeedbackAttributeNames.Any(x => !x.StartsWith("gl_") &&
description.TransformFeedbackAttributeNames.Count(y => y == x) != 1))
{
throw new ArgumentException("All transform feedback attribute names (except gl_*** strings) must be unique.");
}
description.SamplerNames = description.SamplerNames ?? EmptyStringArray;
if (description.SamplerNames.Any(x => x != null && description.SamplerNames.Count(y => y == x) != 1))
{
throw new ArgumentException("All non-null sampler names must be unique.");
}
uint handle = gl.CreateProgram();
program = new ShaderProgram(context, handle);
description.TesselationControlShaders = description.TesselationControlShaders ?? EmptyTessControlShaderArray;
description.TesselationEvaluationShaders = description.TesselationEvaluationShaders ?? EmptyTessEvalShaderArray;
description.GeometryShaders = description.GeometryShaders ?? EmptyGeometryShaderArray;
foreach (var shader in description.VertexShaders)
{
gl.AttachShader(handle, shader.Handle);
}
foreach (var shader in description.TesselationControlShaders)
{
gl.AttachShader(handle, shader.Handle);
}
foreach (var shader in description.TesselationEvaluationShaders)
{
gl.AttachShader(handle, shader.Handle);
}
foreach (var shader in description.GeometryShaders)
{
gl.AttachShader(handle, shader.Handle);
}
foreach (var shader in description.FragmentShaders)
{
gl.AttachShader(handle, shader.Handle);
}
for (uint i = 0; i < description.VertexAttributeNames.Length; i++)
{
if (description.VertexAttributeNames[i] != null)
{
gl.BindAttribLocation(handle, i, description.VertexAttributeNames[i]);
}
}
if (description.TransformFeedbackAttributeNames.Length > 0)
{
gl.TransformFeedbackVaryings(handle, description.TransformFeedbackAttributeNames.Length,
description.TransformFeedbackAttributeNames, (int)description.TransformFeedbackMode);
}
gl.LinkProgram(handle);
int isLinked;
gl.GetProgram(handle, (int)All.LinkStatus, &isLinked);
if (isLinked == 0)
{
program = null;
errors = gl.GetProgramInfoLog(handle);
return(false);
}
for (int i = 0; i < description.VertexAttributeNames.Length; i++)
{
if (description.VertexAttributeNames[i] != null && gl.GetAttribLocation(handle, description.VertexAttributeNames[i]) != i)
{
throw new ArgumentException(string.Format("Vertex attribute '{0}' is not present in the program.", description.VertexAttributeNames[i]));
}
}
for (uint i = 0; i < description.UniformBufferNames.Length; i++)
{
if (description.UniformBufferNames[i] == null)
{
continue;
}
uint programSpecificIndex = gl.GetUniformBlockIndex(handle, description.UniformBufferNames[i]);
if (programSpecificIndex == (uint)All.InvalidIndex)
{
program = null;
errors = string.Format("Uniform Bufffer '{0}' not found.", description.UniformBufferNames[i]);
return(false);
}
gl.UniformBlockBinding(handle, programSpecificIndex, i);
}
context.Bindings.Program.Set(program);
for (int i = 0; i < description.SamplerNames.Length; i++)
{
if (description.SamplerNames[i] == null)
{
continue;
}
int samplerUniformLocation = gl.GetUniformLocation(handle, description.SamplerNames[i]);
gl.Uniform(samplerUniformLocation, i);
}
errors = null;
return(true);
}
public IShaderProgram Program(ShaderProgramDescription description)
{
ShaderProgram result;
string errors;
if (!ShaderProgram.TryLink(context, description, out result, out errors))
throw new ShaderException("Failed to link a shader prgram:\r\n\r\n" + errors);
return result;
}
