GLESBlendAttribute.h

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/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
 
#ifndef META_OCEAN_RENDERING_GLES_BLEND_ATTRIBUTE_H
#define META_OCEAN_RENDERING_GLES_BLEND_ATTRIBUTE_H
 
#include "ocean/rendering/glescenegraph/GLESceneGraph.h"
#include "ocean/rendering/glescenegraph/GLESAttribute.h"
 
#include "ocean/rendering/BlendAttribute.h"
 
namespace Ocean
{
 
namespace Rendering
{
 
namespace GLESceneGraph
{
 
/**
 * This class implements a GLESceneGraph blend attribute.
 * @ingroup renderinggles
 */
class OCEAN_RENDERING_GLES_EXPORT GLESBlendAttribute :
    virtual public GLESAttribute,
    virtual public BlendAttribute
{
    friend class GLESFactory;
 
    public:
 
        /**
         * Returns the blending function for the source object.
         * @see BlendAttribute::sourceFunction().
         */
        BlendingFunction sourceFunction() const override;
 
        /**
         * Returns the blending function for the destination object.
         * @see BlendAttribute::destinationFunction().
         */
        BlendingFunction destinationFunction() const override;
 
        /**
         * Sets the blending function for the source object.
         * @see BlendAttribute::setSourceFunction().
         */
        void setSourceFunction(const BlendingFunction function) override;
 
        /**
         * Sets the blending function for the destination object.
         * @see BlendAttribute::setDestinationFunction().
         */
        void setDestinationFunction(const BlendingFunction function) override;
 
        /**
         * Binds this attribute.
         */
        void bindAttribute(const GLESFramebuffer& framebuffer, GLESShaderProgram& shaderProgram) override;
 
        /**
         * Unbindes this attribute.
         */
        void unbindAttribute() override;
 
    protected:
 
        /**
         * Creates a new GLESceneGraph blend attribute.
         */
        GLESBlendAttribute();
 
        /**
         * Destructs a GLESceneGraph blend attribute.
         */
        ~GLESBlendAttribute() override;
 
        /**
         * Translates a source blending function to the corresponding OpenGL ES enum value.
         * @param function Source blending function to translate
         * @return Corresponding OpenGL ES enum value
         */
        static GLenum translateSourceBlendingFunction(const BlendingFunction function);
 
        /**
         * Translates a destination blending function to the corresponding OpenGL ES enum value.
         * @param function Destination blending function to translate
         * @return Corresponding OpenGL ES enum value
         */
        static GLenum translateDestinationBlendingFunction(const BlendingFunction function);
 
    protected:
 
        /// Selected source blending function of this blend attribute.
        BlendingFunction attributeSourceBlendingFunction;
 
        /// Selected destination blending function of this blend attribute.
        BlendingFunction attributeDestinationBlendingFunction;
 
        /// OpenGL ES source blending value.
        GLenum attributeGLESSourceBlendingFunction;
 
        /// OpenGL ES destination blending value.
        GLenum attributeGLESDestinationBlendingFunction;
};
 
}
 
}
 
}
 
#endif // META_OCEAN_RENDERING_GLES_BLEND_ATTRIBUTE_H