VisibleTrianglesRenderer.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_TRACKING_MAPTEXTURING_VISIBLE_TRIANGLES_RENDERER_H
#define META_OCEAN_TRACKING_MAPTEXTURING_VISIBLE_TRIANGLES_RENDERER_H
 
#include "ocean/tracking/maptexturing/MapTexturing.h"
 
#include "ocean/base/Frame.h"
 
#include "ocean/math/HomogenousMatrix4.h"
 
#include "ocean/rendering/Engine.h"
#include "ocean/rendering/Points.h"
#include "ocean/rendering/ShaderProgram.h"
#include "ocean/rendering/TextureFramebuffer.h"
#include "ocean/rendering/TriangleFace.h"
#include "ocean/rendering/VertexSet.h"
 
namespace Ocean
{
 
namespace Tracking
{
 
namespace MapTexturing
{
 
/**
 * This class implements a renderer for all visible triangles.
 * @ingroup trackingmaptexturing
 */
class OCEAN_TRACKING_MAPTEXTURING_EXPORT VisibleTrianglesRenderer
{
    public:
 
        /**
         * Destructs this renderer and releases all resources.
         */
        ~VisibleTrianglesRenderer();
 
        /**
         * Extracts the visible triangles out of a framebuffer in which all triangles have been rendered.
         * @param engine The rendering engine to be used
         * @param trianglesIdFramebuffer The texture framebuffer holding in which all triangles have been rendered, must be valid
         * @param downsampledDepthFramebuffer The down-sampled and filtered depth buffer of the framebuffer with triangle ids, must be valid
         * @param nearDistance The view's near distance, with range (0, infinity)
         * @param farDistance the view's far distance, with range (nearDistance, infinity)
         * @return True, if succeeded
         */
        bool render(const Rendering::Engine& engine, const Rendering::TextureFramebufferRef& trianglesIdFramebuffer, const Rendering::TextureFramebufferRef& downsampledDepthFramebuffer, const Scalar nearDistance, const Scalar farDistance);
 
        /**
         * Returns the current texture framebuffer of this renderer.
         * @return The renderer's texture framebuffer
         */
        inline const Rendering::TextureFramebufferRef& textureFramebuffer() const;
 
        /**
         * Explicitly releases this renderer and releases all resources.
         */
        void release();
 
        /**
         * Returns whether this renderer has been initialized successfully.
         * @return True, if succeeded
         */
        inline bool isValid() const;
 
    protected:
 
        /// The shader program rendering the ids of visible triangles.
        Rendering::ShaderProgramRef shaderProgramVisibleTriangles_;
 
        /// The shader program removing the ids of (partially) occluded triangles.
        Rendering::ShaderProgramRef shaderProgramOccludedTriangles_;
 
        /// The texture framebuffer used when rendering the color ids.
        Rendering::TextureFramebufferRef textureFramebuffer_;
 
        /// The vertex set holding the vertices to be rendered.
        Rendering::VertexSetRef vertexSet_;
 
        /// The triangle object which will be used to render the triangles.
        Rendering::PointsRef points_;
 
        /// The intermediate frame holding the ids of all visible triangles.
        Frame idFrame_;
 
        /// The platform-specific shader part.
        static const char* partPlatform_;
 
        /// The vertex shader part.
        static const char* programVertexShaderVisibleTriangles_;
 
        /// The vertex shader part.
        static const char* programVertexShaderOccludedTriangles_;
 
        /// The fragment shader part.
        static const char* programFragmentShaderVisibleTriangles_;
 
        /// The fragment shader part.
        static const char* programFragmentShaderOccludedTriangles_;
};
 
inline const Rendering::TextureFramebufferRef& VisibleTrianglesRenderer::textureFramebuffer() const
{
    return textureFramebuffer_;
}
 
}
 
}
 
}
 
#endif // META_OCEAN_TRACKING_MAPTEXTURING_VISIBLE_TRIANGLES_RENDERER_H