MemoryFramebuffer.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_PLATFORM_GL_MEMORY_FRAMEBUFFER_H
#define META_OCEAN_PLATFORM_GL_MEMORY_FRAMEBUFFER_H
 
#include "ocean/platform/gl/GL.h"
#include "ocean/platform/gl/Framebuffer.h"
 
#include "ocean/base/Frame.h"
 
namespace Ocean
{
 
namespace Platform
{
 
namespace GL
{
 
/**
 * This class implements a framebuffer allowing to render into an off-screen framebuffer memory and not into an on-screen framebuffer.
 * @see setFrame().
 * @ingroup platformgl
 */
class OCEAN_PLATFORM_GL_EXPORT MemoryFramebuffer : public Framebuffer
{
    public:
 
        /**
         * Creates a new framebuffer object with initially no associated context.
         */
        MemoryFramebuffer();
 
        /**
         * Creates a new framebuffer object with a given associated context.
         * @param context The associated context
         */
        explicit MemoryFramebuffer(Context& context);
 
        /**
         * Destructs this object.
         */
        virtual ~MemoryFramebuffer();
 
        /**
         * Returns whether this framebuffer is currently bound.
         * @return True, if so
         * @see bind(), unbind().
         */
        inline bool isBound() const;
 
        /**
         * Sets the context of this object.
         * @see Framebuffer::setContext().
         */
        virtual bool setContext(Context& context);
 
        /**
         * Sets the frame in which the framebuffer will be copied.
         * The frame type of the given frame must match with the current dimension and pixel format of the framebuffer.
         * @param frame The receiving the pixel data from the framebuffer
         * @return True, if succeeded
         * @see unsetTargetFrame().
         */
        bool setTargetFrame(Frame& frame);
 
        /**
         * Unsets the frame in which the framebuffer will be copied.
         * @see setTargetFrame().
         */
        inline void unsetTargetFrame();
 
        /**
         * Resizes the off-screen framebuffer.
         * @see Framebuffer::resize().
         */
        virtual bool resize(const unsigned int width, const unsigned int height, const GLenum internalFormat = GL_RGBA8);
 
        /**
         * Binds the framebuffer as target framebuffer.
         * @see Framebuffer::bind(), isBound().
         */
        virtual bool bind();
 
        /**
         * Unbinds the framebuffer as target framebuffer.
         * If a target frame is defined the pixel data of the framebuffer will be copied into the target frame just before the framebuffer is unbound.<br>
         * @see Framebuffer::unbind(), isBound(), setTargetFrame().
         */
        virtual bool unbind();
 
        /**
         * Releases the object.
         * @return True, if succeeded
         */
        bool release();
 
    protected:
 
        /// The id of the framebuffer object.
        GLuint framebufferObjectId;
 
        /// The id of the render buffer.
        GLuint framebufferRenderBufferId;
 
        /// The id of the intermediate framebuffer object.
        GLuint framebufferIntermediateObjectId;
 
        /// The id of the intermediate render buffer object.
        GLuint framebufferIntermediateRenderBufferId;
 
        /// True, if this framebuffer is currently bound.
        bool framebufferIsBound;
 
        /// The frame in which the pixel data from the framebuffer will be copied, if defined
        Frame* framebufferFrame;
};
 
inline bool MemoryFramebuffer::isBound() const
{
    return framebufferIsBound;
}
 
inline void MemoryFramebuffer::unsetTargetFrame()
{
    framebufferFrame = nullptr;
}
 
 
}
 
}
 
}
 
#endif // META_OCEAN_PLATFORM_GL_MEMORY_FRAMEBUFFER_H