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#ifndef OSD_GLSL_TRANSFORM_FEEDBACK_KERNEL_BUNDLE_H
#define OSD_GLSL_TRANSFORM_FEEDBACK_KERNEL_BUNDLE_H

#if defined(__APPLE__)
    #include "TargetConditionals.h"
    #if TARGET_OS_IPHONE or TARGET_IPHONE_SIMULATOR
        #include <OpenGLES/ES2/gl.h>
    #else
        #include <OpenGL/gl3.h>
    #endif
#elif defined(ANDROID)
    #include <GLES2/gl2.h>
#else
    #if defined(_WIN32)
        #include <windows.h>
    #endif
    #include <GL/gl.h>
#endif

#include "../version.h"

#include "../osd/computeContext.h"
#include "../osd/nonCopyable.h"

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

    class OsdGLSLTransformFeedbackKernelBundle
        : OsdNonCopyable<OsdGLSLTransformFeedbackKernelBundle> {
    public:
        OsdGLSLTransformFeedbackKernelBundle();
        ~OsdGLSLTransformFeedbackKernelBundle();

        bool Compile(int numVertexElements, int numVaryingElements);

        void ApplyBilinearFaceVerticesKernel(
            GLuint vertexBuffer, int numVertexElements,
            GLuint varyingBuffer, int numVaryingElements,
            int F_IT_ofs, int F_ITa_ofs, int offset, int start, int end);

        void ApplyBilinearEdgeVerticesKernel(
            GLuint vertexBuffer, int numVertexElements,
            GLuint varyingBuffer, int numVaryingElements,
            int E_IT_ofs, int offset, int start, int end);

        void ApplyBilinearVertexVerticesKernel(
            GLuint vertexBuffer, int numVertexElements,
            GLuint varyingBuffer, int numVaryingElements,
            int V_ITa_ofs, int offset, int start, int end);

        void ApplyCatmarkFaceVerticesKernel(
            GLuint vertexBuffer, int numVertexElements,
            GLuint varyingBuffer, int numVaryingElements,
            int F_IT_ofs, int F_ITa_ofs, int offset, int start, int end);

        void ApplyCatmarkEdgeVerticesKernel(
            GLuint vertexBuffer, int numVertexElements,
            GLuint varyingBuffer, int numVaryingElements,
            int E_IT_ofs, int E_W_ofs, int offset, int start, int end);

        void ApplyCatmarkVertexVerticesKernelB(
            GLuint vertexBuffer, int numVertexElements,
            GLuint varyingBuffer, int numVaryingElements,
            int V_IT_ofs, int V_ITa_ofs, int V_W_ofs,
            int offset, int start, int end);

        void ApplyCatmarkVertexVerticesKernelA(
            GLuint vertexBuffer, int numVertexElements,
            GLuint varyingBuffer, int numVaryingElements,
            int V_ITa_ofs, int V_W_ofs,
            int offset, bool pass, int start, int end);

        void ApplyLoopEdgeVerticesKernel(
            GLuint vertexBuffer, int numVertexElements,
            GLuint varyingBuffer, int numVaryingElements,
            int E_IT_ofs, int E_W_ofs, int offset, int start, int end);

        void ApplyLoopVertexVerticesKernelB(
            GLuint vertexBuffer, int numVertexElements,
            GLuint varyingBuffer, int numVaryingElements,
            int V_IT_ofs, int V_ITa_ofs, int V_W_ofs,
            int offset, int start, int end);

        void ApplyLoopVertexVerticesKernelA(
            GLuint vertexBuffer, int numVertexElements,
            GLuint varyingBuffer, int numVaryingElements,
            int V_ITa_ofs, int V_W_ofs,
            int offset, bool pass, int start, int end);

        void ApplyEditAdd(
            GLuint vertexBuffer, int numVertexElements,
            GLuint varyingBuffer, int numVaryingElements,
            int numEditVertices,
            int editIndices_ofs, int editValues_ofs,
            int primvarOffset, int primvarWidth);

        void UseProgram() const;

        GLuint GetTableUniformLocation(int tableIndex) const {
            return _uniformTables[tableIndex];
        }
        GLuint GetVertexUniformLocation() const {
            return _uniformVertexBuffer;
        }
        GLuint GetVaryingUniformLocation() const {
            return _uniformVaryingBuffer;
        }
        GLuint GetEditIndicesUniformLocation() const {
            return _uniformEditIndices;
        }
        GLuint GetEditValuesUniformLocation() const {
            return _uniformEditValues;
        }
        GLuint GetVertexBufferImageUniformLocation() const {
            return _uniformVertexBufferImage;
        }

        struct Match {
        Match(int numVertexElements, int numVaryingElements) :
            _numVertexElements(numVertexElements),
                _numVaryingElements(numVaryingElements) {}
            bool operator() (const OsdGLSLTransformFeedbackKernelBundle *kernel) {
                return (kernel->_numVertexElements == _numVertexElements
                        && kernel->_numVaryingElements == _numVaryingElements);
            }
            int _numVertexElements, _numVaryingElements;
        };

        friend struct Match;

    protected:
        void transformGpuBufferData(
            GLuint vertexBuffer, int numVertexElements,
            GLuint varyingBuffer, int numVaryingElements,
            GLint offset, int start, int end) const;

        GLuint _program;

        // uniform locations
        GLuint _uniformTables[Table::TABLE_MAX];
        GLuint _uniformTableOffsets[Table::TABLE_MAX];

        GLuint _uniformVertexPass;
        GLuint _uniformIndexStart;
        GLuint _uniformIndexOffset;

        GLuint _uniformVertexBuffer;
        GLuint _uniformVaryingBuffer;

        GLuint _uniformEditNumVertices;
        GLuint _uniformEditIndicesOffset;
        GLuint _uniformEditValuesOffset;
        GLuint _uniformEditPrimVarOffset;
        GLuint _uniformEditPrimVarWidth;

        GLuint _uniformEditIndices;
        GLuint _uniformEditValues;
        GLuint _uniformVertexBufferImage;

        // subroutines
        // general face-vertex kernel (all schemes)
        GLuint _subComputeFace;
        // edge-vertex kernel (catmark + loop schemes)
        GLuint _subComputeEdge;
        // edge-vertex kernel (bilinear scheme)
        GLuint _subComputeBilinearEdge;
        // vertex-vertex kernel (bilinear scheme)
        GLuint _subComputeVertex;
        // vertex-vertex kernel A (catmark + loop schemes)
        GLuint _subComputeVertexA;
        // vertex-vertex kernel B (catmark scheme)
        GLuint _subComputeCatmarkVertexB;
        // vertex-vertex kernel B (loop scheme)
        GLuint _subComputeLoopVertexB;
        // hedit kernel (add)
        GLuint _subEditAdd;

        int _numVertexElements,
            _numVaryingElements;
    };

}  // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

}  // end namespace OpenSubdiv

#endif  // OSD_GLSL_TRANSFORM_FEEDBACK_KERNEL_BUNDLE_H