glslProgram.h

//
// Copyright 2016 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HD_ST_GLSL_PROGRAM_H
#define PXR_IMAGING_HD_ST_GLSL_PROGRAM_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hd/version.h"
#include "pxr/imaging/hdSt/api.h"
#include "pxr/imaging/hgi/buffer.h"
#include "pxr/imaging/hgi/shaderProgram.h"
#include "pxr/imaging/hgi/enums.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
class HdStResourceRegistry;
using HdStGLSLProgramSharedPtr = std::shared_ptr<class HdStGLSLProgram>;
 
using HgiShaderProgramHandle = HgiHandle<class HgiShaderProgram>;
 
class HdStGLSLProgram final
{
public:
    typedef size_t ID;
 
    HDST_API
    HdStGLSLProgram(TfToken const &role, HdStResourceRegistry*const registry);
    HDST_API
    ~HdStGLSLProgram();
 
    HDST_API
    bool CompileShader(HgiShaderStage stage, std::string const & source);
 
    HDST_API
    bool CompileShader(HgiShaderFunctionDesc const &desc);
 
    HDST_API
    bool Link();
 
    HDST_API
    bool Validate() const;
 
    HgiShaderProgramHandle const &GetProgram() const { return _program; }
 
    HDST_API
    static HdStGLSLProgramSharedPtr GetComputeProgram(
        TfToken const &shaderToken,
        HdStResourceRegistry *resourceRegistry);
 
    HDST_API
    static HdStGLSLProgramSharedPtr GetComputeProgram(
        TfToken const &shaderFileName,
        TfToken const &shaderToken,
        HdStResourceRegistry *resourceRegistry);
 
    using PopulateDescriptorCallback =
        std::function<void(HgiShaderFunctionDesc &computeDesc)>;
 
    HDST_API
    static HdStGLSLProgramSharedPtr GetComputeProgram(
        TfToken const &shaderToken,
        HdStResourceRegistry *resourceRegistry,
        PopulateDescriptorCallback populateDescriptor);
 
    HDST_API
    static HdStGLSLProgramSharedPtr GetComputeProgram(
        TfToken const &shaderToken,
        std::string const &defines,
        HdStResourceRegistry *resourceRegistry,
        PopulateDescriptorCallback populateDescriptor);
 
    HDST_API
    static HdStGLSLProgramSharedPtr GetComputeProgram(
        TfToken const &shaderFileName,
        TfToken const &shaderToken,
        std::string const &defines,
        HdStResourceRegistry *resourceRegistry,
        PopulateDescriptorCallback populateDescriptor);
 
    TfToken const & GetRole() const {return _role;}
 
private:
    HdStResourceRegistry *const _registry;
    TfToken _role;
 
    HgiShaderProgramDesc _programDesc;
    HgiShaderProgramHandle _program;
 
    // An identifier for uniquely identifying the program, for debugging
    // purposes - programs that fail to compile for one reason or another
    // will get deleted, and their GL program IDs reused, so we can't use
    // that to identify it uniquely
    size_t _debugID;
};
 
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif  // PXR_IMAGING_HD_ST_GLSL_PROGRAM_H