bindingMap.h

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//
// Copyright 2016 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_GLF_BINDING_MAP_H
#define PXR_IMAGING_GLF_BINDING_MAP_H
 
 
#include "pxr/pxr.h"
#include "pxr/imaging/glf/api.h"
#include "pxr/imaging/garch/glApi.h"
#include "pxr/base/tf/refBase.h"
#include "pxr/base/tf/stringUtils.h"
#include "pxr/base/tf/token.h"
#include "pxr/base/tf/weakBase.h"
 
#include "pxr/base/tf/hashmap.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
 
class GlfBindingMap : public TfRefBase, public TfWeakBase {
public:
    typedef TfHashMap<TfToken, int, TfToken::HashFunctor> BindingMap;
 
    GlfBindingMap()
      : _samplerBindingBaseIndex(0)
      , _uniformBindingBaseIndex(0)
      { }
 
    GLF_API
    int GetSamplerUnit(std::string const &name);
    GLF_API
    int GetSamplerUnit(TfToken const & name);
 
    // If GetAttributeIndex is called with an unknown
    // attribute token they return -1
    GLF_API
    int GetAttributeIndex(std::string const & name);
    GLF_API
    int GetAttributeIndex(TfToken const & name);
 
    GLF_API
    int GetUniformBinding(std::string const & name);
    GLF_API
    int GetUniformBinding(TfToken const & name);
 
    GLF_API
    bool HasUniformBinding(std::string const & name) const;
    GLF_API
    bool HasUniformBinding(TfToken const & name) const;
 
    int GetNumSamplerBindings() const {
        return (int)_samplerBindings.size();
    }
 
    void ClearAttribBindings() {
        _attribBindings.clear();
    }
 
 
    void ResetSamplerBindings(int baseIndex) {
        _samplerBindings.clear();
        _samplerBindingBaseIndex = baseIndex;
    }
 
    void ResetUniformBindings(int baseIndex) {
        _uniformBindings.clear();
        _uniformBindingBaseIndex = baseIndex;
    }
 
 
    void AddAttribBinding(TfToken const &name, int location) {
        _attribBindings[name] = location;
    }
 
    BindingMap const &GetAttributeBindings() const {
        return _attribBindings;
    }
 
    GLF_API
    void AssignSamplerUnitsToProgram(GLuint program);
 
    GLF_API
    void AssignUniformBindingsToProgram(GLuint program);
 
    GLF_API
    void AddCustomBindings(GLuint program);
 
    GLF_API
    void Debug() const;
 
private:
    void _AddActiveAttributeBindings(GLuint program);
    void _AddActiveUniformBindings(GLuint program);
    void _AddActiveUniformBlockBindings(GLuint program);
 
    BindingMap _attribBindings;
    BindingMap _samplerBindings;
    BindingMap _uniformBindings;
 
    int _samplerBindingBaseIndex;
    int _uniformBindingBaseIndex;
};
 
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif  // PXR_IMAGING_GLF_BINDING_MAP_H