GLTextureHandler.h

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//
// Copyright Contributors to the MaterialX Project
// SPDX-License-Identifier: Apache-2.0
//
 
#ifndef MATERIALX_GLTEXTUREHANDLER_H
#define MATERIALX_GLTEXTUREHANDLER_H
 
 
#include <MaterialXRenderGlsl/Export.h>
 
#include <MaterialXRender/ImageHandler.h>
 
MATERIALX_NAMESPACE_BEGIN
 
using GLTextureHandlerPtr = std::shared_ptr<class GLTextureHandler>;
 
class MX_RENDERGLSL_API GLTextureHandler : public ImageHandler
{
  public:
    static ImageHandlerPtr create(ImageLoaderPtr imageLoader)
    {
        return ImageHandlerPtr(new GLTextureHandler(imageLoader));
    }
 
    bool bindImage(ImagePtr image, const ImageSamplingProperties& samplingProperties) override;
 
    bool unbindImage(ImagePtr image) override;
 
    bool createRenderResources(ImagePtr image, bool generateMipMaps, bool useAsRenderTarget = false) override;
 
    void releaseRenderResources(ImagePtr image = nullptr) override;
 
    int getBoundTextureLocation(unsigned int resourceId);
 
    static int mapAddressModeToGL(ImageSamplingProperties::AddressMode addressModeEnum);
 
    static int mapFilterTypeToGL(ImageSamplingProperties::FilterType filterTypeEnum, bool enableMipmaps);
 
    static void mapTextureFormatToGL(Image::BaseType baseType, unsigned int channelCount, bool srgb,
                                     int& glType, int& glFormat, int& glInternalFormat);
 
  protected:
    // Protected constructor
    GLTextureHandler(ImageLoaderPtr imageLoader);
 
    // Return the first free texture location that can be bound to.
    int getNextAvailableTextureLocation();
 
  protected:
    std::vector<unsigned int> _boundTextureLocations;
};
 
MATERIALX_NAMESPACE_END
 
#endif