rendering/glescenegraph/GLESFramebuffer.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_FRAMEBUFFER_H
#define META_OCEAN_RENDERING_GLES_FRAMEBUFFER_H
 
#include "ocean/rendering/glescenegraph/GLESceneGraph.h"
#include "ocean/rendering/glescenegraph/GLESObject.h"
#include "ocean/rendering/glescenegraph/GLESTextureFramebuffer.h"
#include "ocean/rendering/glescenegraph/GLESTraverser.h"
 
#include "ocean/rendering/Framebuffer.h"
 
namespace Ocean
{
 
namespace Rendering
{
 
namespace GLESceneGraph
{
 
/**
 * This class implements a base for all GLESceneGraph framebuffers.
 * @ingroup renderinggles
 */
class OCEAN_RENDERING_GLES_EXPORT GLESFramebuffer :
    virtual public GLESObject,
    virtual public Framebuffer
{
    public:
 
        /**
         * Definitions of individual stereo framebuffers.
         */
        enum StereoType
        {
            /// An invalid framebuffer type.
            ST_INVALID = 0,
            /// Framebuffer of a mono view.
            ST_MONO,
            /// Framebuffer of a left stereo view.
            ST_LEFT,
            /// Framebuffer of a right stereo view.
            ST_RIGHT
        };
 
    public:
 
        /**
         * Returns the viewport of this framebuffer.
         * @see Framebuffer::viewport().
         */
        void viewport(unsigned int& left, unsigned int& top, unsigned int& width, unsigned int& height) const override;
 
        /**
         * Returns whether the framebuffer supports hardware anti-aliasing.
         * @see Framebuffer::isAntialiasingSupported().
         */
        bool isAntialiasingSupported(const unsigned int buffers) const override;
 
        /**
         * Returns whether the framebuffer uses hardware anti-aliasing.
         * @see Framebuffer::isAntialiasing().
         */
        bool isAntialiasing() const override;
 
        /**
         * Returns the face mode of the entire framebuffer.
         * @see Framebuffer::faceMode().
         */
        FaceMode faceMode() const override;
 
        /**
         * Returns the global face culling mode of the entire framebuffer.
         * @see Framebuffer::cullingMode().
         */
        CullingMode cullingMode() const override;
 
        /**
         * Returns the global lighting mode of the entire framebuffer.
         * @see Framebuffer::lightingMode().
         */
        LightingMode lightingMode() const override;
 
        /**
         * Returns the render technique of the entire framebuffer.
         * @see Framebuffer::renderTechnique().
         */
        RenderTechnique renderTechnique() const override;
 
        /**
         * Returns the shadow technique of the entire framebuffer.
         * @see Framebuffer::shadowTechnique().
         */
        ShadowTechnique shadowTechnique() const override;
 
        /**
         * Returns the stereo type of this framebuffer.
         * @return The framebuffer's stereo type, ST_MONO by default
         */
        virtual StereoType stereoType() const;
 
        /**
         * Sets the viewport of this framebuffer.
         * @see Framebuffer::setViewport().
         */
        void setViewport(const unsigned int left, const unsigned int top, const unsigned int width, const unsigned int height) override;
 
        /**
         * Sets whether the framebuffer uses hardware anti-aliasing.
         * @see Framebuffer::setAntialiasing().
         */
        bool setAntialiasing(const bool antialiasing) override;
 
        /**
         * Sets the face mode of the entire framebuffer.
         * @see Framebuffer::setFaceMode().
         */
        void setFaceMode(const FaceMode mode) override;
 
        /**
         * Sets the global culling mode of the entire framebuffer.
         * @see Framebuffer::setCullingMode().
         */
        void setCullingMode(const CullingMode cullingMode) override;
 
        /**
         * Sets the global lighting mode of the entire framebuffer.
         * @see Framebuffer::setLightingMode().
         */
        void setLightingMode(const LightingMode lightingMode) override;
 
        /**
         * Sets the rendering technique of the entire framebuffer.
         * @see Framebuffer::setRenderTechnique().
         */
        void setRenderTechnique(const RenderTechnique technique) override;
 
        /**
         * Sets the shadow technique of the entire framebuffer.
         * @see Framebuffer::setShadowTechnique().
         */
        void setShadowTechnique(const ShadowTechnique technique) override;
 
        /**
         * Sets the stereo type of this framebuffer.
         * @param stereoType The stereo type to set
         */
        virtual void setStereoType(const StereoType stereoType);
 
        /**
         * Renders the next frame into the framebuffer.
         * @see Framebuffer::render().
         */
        void render() override;
 
        /**
         * Returns the renderable object intersected by a given ray.
         * @see Framebuffer::intersection().
         */
        bool intersection(const Line3& ray, RenderableRef& renderable, Vector3& position) override;
 
        /**
         * Returns whether the platform supports a specific extension.
         * @see Framebuffer::hasExtension().
         */
        bool hasExtension(const std::string& extension) const override;
 
        /**
         * Linearizes a given z-buffer depth frame with non-linear (e.g., logarithmic) depth.
         * By default in OpenGL, the depth coordinates range from −1 to 1, corresponding to the near and far clipping planes (after clipping and division by w).<br>
         * @param depthFrame The non-linear depth to linearize, with value range [-1, 1], must be valid
         * @param nearDistance The distance to the near clipping plane of the depth frame, with range (0, infinity)
         * @param farDistance The distance to the far clipping plane of the depth frame, with range (nearDistance, infinity)
         * @return True, if succeeded
         */
        bool linearizeDepthFrame(Frame& depthFrame, const Scalar nearDistance, const Scalar farDistance) const override;
 
    protected:
 
        /**
         * Creates a new GLESceneGraph framebuffer object.
         */
        GLESFramebuffer();
 
        /**
         * Destructs a GLESceneGraph framebuffer object.
         */
        ~GLESFramebuffer() override;
 
        /**
         * Initializes the framebuffer.
         * @see Framebuffer::initialize().
         */
        bool initialize(const FramebufferRef& shareFramebuffer = FramebufferRef()) override;
 
        /**
         * Initialize the OpenGL ES display and context.
         * @return True, if succeeded
         */
        virtual bool initializeContext();
 
        /**
         * Initialize the OpenGL ES environment properties.
         * @return True, if succeeded
         */
        virtual bool initializeOpenGLES();
 
        /**
         * Releases the framebuffer.
         * @see Framebuffer::release().
         */
        void release() override;
 
    protected:
 
#ifndef OCEAN_RENDERING_GLES_USE_ES
        /// The face mode which is only supported in OpenGL.
        FaceMode faceMode_ = PrimitiveAttribute::MODE_FACE;
#endif
 
        /// Global lighting mode for the entire framebuffer.
        CullingMode cullingMode_ = PrimitiveAttribute::CULLING_DEFAULT;
 
        /// Global lighting mode for the entire framebuffer.
        LightingMode lightingMode_ = PrimitiveAttribute::LM_DEFAULT;
 
        /// The string will all extensions separated by spaces.
        std::string extensions_;
 
        /// Viewport left position.
        unsigned int viewportLeft_ = (unsigned int)(-1);
 
        /// Viewport top position.
        unsigned int viewportTop_ = (unsigned int)(-1);
 
        /// Viewport width value.
        unsigned int viewportWidth_ = (unsigned int)(0);
 
        /// Viewport height value.
        unsigned int viewportHeight_ = (unsigned int)(0);
 
        /// The stereo framebuffer type.
        StereoType stereoType_ = ST_MONO;
 
        /// The traverser which is used for rendering.
        GLESTraverser traverser_;
 
        /// The texture framebuffer which is used for picking objects.
        SmartObjectRef<GLESTextureFramebuffer> pickingTextureFramebuffer_;
};
 
}
 
}
 
}
 
#endif // META_OCEAN_RENDERING_GLES_FRAMEBUFFER_H