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#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/glew.h>
#endif

#include "../osd/glslComputeController.h"
#include "../osd/glslComputeContext.h"
#include "../osd/glslKernelBundle.h"
#include "../osd/table.h"

#include <algorithm>
#include <cassert>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

OsdGLSLComputeController::OsdGLSLComputeController() {
}

OsdGLSLComputeController::~OsdGLSLComputeController() {

    for (std::vector<OsdGLSLComputeKernelBundle*>::iterator it =
             _kernelRegistry.begin();
         it != _kernelRegistry.end(); ++it) {
        delete *it;
    }
}

void
OsdGLSLComputeController::Synchronize() {

    glFinish();
}

OsdGLSLComputeKernelBundle *
OsdGLSLComputeController::getKernels(int numVertexElements,
                                     int numVaryingElements) {

    std::vector<OsdGLSLComputeKernelBundle*>::iterator it =
        std::find_if(_kernelRegistry.begin(), _kernelRegistry.end(),
                     OsdGLSLComputeKernelBundle::Match(numVertexElements,
                                                numVaryingElements));
    if (it != _kernelRegistry.end()) {
        return *it;
    } else {
        OsdGLSLComputeKernelBundle *kernelBundle =
            new OsdGLSLComputeKernelBundle();
        _kernelRegistry.push_back(kernelBundle);
        kernelBundle->Compile(numVertexElements, numVaryingElements);
        return kernelBundle;
    }
}

void
OsdGLSLComputeController::ApplyBilinearFaceVerticesKernel(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    kernelBundle->ApplyBilinearFaceVerticesKernel(
        batch.GetVertexOffset(), batch.GetTableOffset(), batch.GetStart(), batch.GetEnd());
}

void
OsdGLSLComputeController::ApplyBilinearEdgeVerticesKernel(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    kernelBundle->ApplyBilinearEdgeVerticesKernel(
        batch.GetVertexOffset(), batch.GetTableOffset(), batch.GetStart(), batch.GetEnd());
}

void
OsdGLSLComputeController::ApplyBilinearVertexVerticesKernel(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    kernelBundle->ApplyBilinearVertexVerticesKernel(
        batch.GetVertexOffset(), batch.GetTableOffset(), batch.GetStart(), batch.GetEnd());
}

void
OsdGLSLComputeController::ApplyCatmarkFaceVerticesKernel(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    kernelBundle->ApplyCatmarkFaceVerticesKernel(
        batch.GetVertexOffset(), batch.GetTableOffset(), batch.GetStart(), batch.GetEnd());
}



void
OsdGLSLComputeController::ApplyCatmarkEdgeVerticesKernel(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    kernelBundle->ApplyCatmarkEdgeVerticesKernel(
        batch.GetVertexOffset(), batch.GetTableOffset(), batch.GetStart(), batch.GetEnd());
}

void
OsdGLSLComputeController::ApplyCatmarkVertexVerticesKernelB(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    kernelBundle->ApplyCatmarkVertexVerticesKernelB(
        batch.GetVertexOffset(), batch.GetTableOffset(), batch.GetStart(), batch.GetEnd());
}

void
OsdGLSLComputeController::ApplyCatmarkVertexVerticesKernelA1(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    kernelBundle->ApplyCatmarkVertexVerticesKernelA(
        batch.GetVertexOffset(), batch.GetTableOffset(), batch.GetStart(), batch.GetEnd(), false);
}

void
OsdGLSLComputeController::ApplyCatmarkVertexVerticesKernelA2(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    kernelBundle->ApplyCatmarkVertexVerticesKernelA(
        batch.GetVertexOffset(), batch.GetTableOffset(), batch.GetStart(), batch.GetEnd(), true);
}

void
OsdGLSLComputeController::ApplyLoopEdgeVerticesKernel(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    kernelBundle->ApplyLoopEdgeVerticesKernel(
        batch.GetVertexOffset(), batch.GetTableOffset(), batch.GetStart(), batch.GetEnd());
}

void
OsdGLSLComputeController::ApplyLoopVertexVerticesKernelB(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    kernelBundle->ApplyLoopVertexVerticesKernelB(
        batch.GetVertexOffset(), batch.GetTableOffset(), batch.GetStart(), batch.GetEnd());
}

void
OsdGLSLComputeController::ApplyLoopVertexVerticesKernelA1(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    kernelBundle->ApplyLoopVertexVerticesKernelA(
        batch.GetVertexOffset(), batch.GetTableOffset(), batch.GetStart(), batch.GetEnd(), false);
}

void
OsdGLSLComputeController::ApplyLoopVertexVerticesKernelA2(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    kernelBundle->ApplyLoopVertexVerticesKernelA(
        batch.GetVertexOffset(), batch.GetTableOffset(), batch.GetStart(), batch.GetEnd(), true);
}

void
OsdGLSLComputeController::ApplyVertexEdits(
    FarKernelBatch const &batch, void * clientdata) const {

    OsdGLSLComputeContext * context =
        static_cast<OsdGLSLComputeContext*>(clientdata);
    assert(context);

    OsdGLSLComputeKernelBundle * kernelBundle = context->GetKernelBundle();

    const OsdGLSLComputeHEditTable * edit = context->GetEditTable(batch.GetTableIndex());
    assert(edit);

    context->BindEditShaderStorageBuffers(batch.GetTableIndex());

    int primvarOffset = edit->GetPrimvarOffset();
    int primvarWidth = edit->GetPrimvarWidth();
    
    if (edit->GetOperation() == FarVertexEdit::Add) {
        kernelBundle->ApplyEditAdd( primvarOffset, 
                                    primvarWidth,
                                    batch.GetVertexOffset(), 
                                    batch.GetTableOffset(), 
                                    batch.GetStart(), 
                                    batch.GetEnd());
    } else {
        // XXX: edit SET is not implemented yet.
    }
    
    context->UnbindEditShaderStorageBuffers();
}

}  // end namespace OPENSUBDIV_VERSION
}  // end namespace OpenSubdiv