GLESProgramManager.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_PROGRAM_MANAGER_H
#define META_OCEAN_RENDERING_GLES_PROGRAM_MANAGER_H
 
#include "ocean/rendering/glescenegraph/GLESceneGraph.h"
#include "ocean/rendering/glescenegraph/GLESAttribute.h"
#include "ocean/rendering/glescenegraph/GLESShader.h"
#include "ocean/rendering/glescenegraph/GLESShaderProgram.h"
 
#include "ocean/base/Lock.h"
#include "ocean/base/Singleton.h"
 
#include "ocean/rendering/Engine.h"
 
#include <map>
 
namespace Ocean
{
 
namespace Rendering
{
 
namespace GLESceneGraph
{
 
/**
 * This class implements a manager for OpenGL ES shader programs.
 * @ingroup renderinggles
 */
class OCEAN_RENDERING_GLES_EXPORT GLESProgramManager : public Singleton<GLESProgramManager>
{
    friend class Singleton<GLESProgramManager>;
 
    protected:
 
        /**
         * Definition of a vector holding pointers to shader codes.
         */
        typedef std::vector<const char*> ShaderCodes;
 
        /**
         * Definition of a map mapping shader codes to compiled shader objects.
         */
        typedef std::map<ShaderCodes, GLESShaderRef> ShaderMap;
 
        /**
         * Definition of an unordered map mapping program types to program objects.
         */
        typedef std::unordered_map<GLESAttribute::ProgramType, GLESShaderProgramRef> ProgramMap;
 
    public:
 
        /**
         * Returns a specified shader with the specified functionalities.
         * @param engine The rendering engine to be used
         * @param programType The necessary shader program type
         * @return The specified shader object, invalid if the program could not be created
         */
        GLESShaderProgramRef program(const Engine& engine, const GLESAttribute::ProgramType programType);
 
        /**
         * Releases the shader manager.
         * This function should be called once before program termination.
         */
        void release();
 
    protected:
 
        /**
         * Creates an shader manager.
         */
        GLESProgramManager();
 
        /**
         * Destructs a shader manager.
         */
        ~GLESProgramManager();
 
        /**
         * Returns the vertex shader code with a specified functionality.
         * @param programType Shader program functionalities
         * @return Vertex shader code which must not be released
         */
        ShaderCodes vertexShaderCodes(const GLESAttribute::ProgramType programType) const;
 
        /**
         * Returns the fragment shader code with a specified functionality.
         * @param programType Shader program functionalities
         * @return Fragment shader code which must not be released
         */
        ShaderCodes fragmentShaderCodes(const GLESAttribute::ProgramType programType) const;
 
    protected:
 
        /// Map mapping vertex shader codes to compiled shader objects.
        ShaderMap vertexShaders_;
 
        /// Map mapping fragment shader codes to compiled shader objects.
        ShaderMap fragmentShaders_;
 
        /// Map mapping program types to shader program objects.
        ProgramMap programMap_;
 
        /// Lock for the program manager.
        Lock lock_;
 
#ifdef OCEAN_DEBUG
 
        /// State determining whether this manager has been released.
        bool debugReleased_;
 
#endif // OCEAN_DEBUG
 
        /// The code part containing platform specific information e.g., shader version.
        static const char* partPlatform_;
 
        /// The code part containing the macro to convert a 1-texture Y8 lookup to a RGBA32 value
        static const char* partOneTextureLookupY8ToRGBA32_;
 
        /// The code part containing the macro to convert a 1-texture RGBA32 lookup to a RGBA32 value
        static const char* partOneTextureLookupRGBA32ToRGBA32_;
 
        /// The code part containing the macro to convert a 1-texture BGRA32 lookup to a RGBA32 value
        static const char* partOneTextureLookupBGRA32ToRGBA32_;
 
        /// The code part containing the macro to convert the 1-texture YUV24 lookup to a RGBA32 value
        static const char* partOneTextureLookupYUV24ToRGBA32_;
 
        /// The code part containing the macro to convert the 1-texture YUV24 lookup to a RGBA32 value
        static const char* partOneTextureLookupYVU24ToRGBA32_;
 
        /// The code part containing the macro to convert the 2-texture Y_UV12 lookup to a RGBA32 value
        static const char* partTwoTexturesLookupY_UV12ToRGBA32_;
 
        /// The code part containing the macro to convert the 2-texture Y_VU12 lookup to a RGBA32 value
        static const char* partTwoTexturesLookupY_VU12ToRGBA32_;
 
        /// The code part containing the macro to convert the 2-texture Y_U_V12 lookup to a RGBA32 value
        static const char* partTwoTexturesLookupY_U_V12ToRGBA32_;
 
        /// The code part defining the Material struct.
        static const char* partDefinitionMaterial_;
 
        /// The code part defining the Light struct.
        static const char* partDefinitionLight_;
 
        /// The code part defining the function to determine the light for a vertex based on up to 8 lights
        static const char* partFunctionLighting_;
 
        /// Vertex shader code: PT_STATIC_COLOR.
        static const char* programVertexShaderStaticColor_;
 
        /// Vertex shader code: PT_COLOR_ID.
        static const char* programVertexShaderColorId_;
 
        /// Vertex shader code: PT_POINTS.
        static const char* programVertexShaderPoints_;
 
        /// Vertex shader code: PT_POINTS | PT_MATERIAL.
        static const char* programVertexShaderPointsMaterial_;
 
        /// Vertex shader code: PT_POINTS | PT_MATERIAL | PT_LIGHT.
        static const char* programVertexShaderPointsMaterialLight_;
 
        /// Vertex shader code: PT_DEBUG_GRAY.
        static const char* programVertexShaderDebugGray_;
 
        /// Vertex shader code: PT_MATERIAL.
        static const char* programVertexShaderMaterial_;
 
        /// Vertex shader code: PT_MATERIAL | PT_LIGHT.
        static const char* programVertexShaderMaterialLight_;
 
        /// Vertex shader code: PT_TEXTURE_LOWER/UPPLER_LEFT | PT_TEXTURE_BGRA/RGBA.
        static const char* programVertexShaderTexture_;
 
        /// Vertex shader code: PT_MATERIAL | PT_LIGHT | PT_TEXTURE_LOWER/UPPER_LEFT | PT_TEXTURE_BGRA/RGBA:
        static const char* programVertexShaderMaterialLightTexture_;
 
        /// Vertex shader code: PT_PHANTOM_VIDEO_TEXTURE_COORDINATES_FAST:
        static const char* programVertexShaderPhantomVideoTextureCoordinatesFast_;
 
        /// Vertex shader code: PT_OPAQUE_TEXT_Y | PT_MATERIAL | PT_LIGHT.
        static const char* programVertexShaderOpaqueTextMaterialLight_;
 
        /// Vertex shader code: PT_TRANSPARENT_TEXT_Y | PT_MATERIAL | PT_LIGHT.
        static const char* programVertexShaderTransparentTextMaterialLight_;
 
        /// Fragment shader code: PT_STATIC_COLOR.
        static const char* programFragmentShaderStaticColor_;
 
        /// Fragment shader code: PT_DEBUG_GRAY.
        static const char* programFragmentShaderOneSidedColor_;
 
        /// Fragment shader code: PT_MATERIAL.
        static const char* programFragmentShaderTwoSidedColor_;
 
        /// Fragment shader code for color ids.
        static const char* programFragmentShaderColorId_;
 
        /// Fragment shader code for one texture.
        static const char* programFragmentShaderOneTexture_;
 
        /// Fragment shader code for two textures.
        static const char* programFragmentShaderTwoTextures_;
 
        /// Fragment shader code: PT_MATERIAL | PT_TEXTURE_LOWER/UPPER_LEFT.
        static const char* programFragmentShaderMaterialTexture_;
 
        /// Fragment shader code: PT_PHANTOM_VIDEO_FAST | PT_TEXTURE_LOWER/UPPER_LEFT.
        static const char* programFragmentShaderPhantomVideoFastOneTexture_;
 
        /// Fragment shader code: PT_PHANTOM_VIDEO_FAST | PT_TEXTURE_LOWER/UPPER_LEFT.
        static const char* programFragmentShaderPhantomVideoFastTwoTextures_;
 
        /// Fragment shader code: PT_OPAQUE_TEXT_Y.
        static const char* programFragmentShaderOpaqueTextY_;
 
        /// Fragment shader code: PT_TRANSPARENT_TEXT_Y.
        static const char* programFragmentShaderTransparentTextY_;
};
 
}
 
}
 
}
 
#endif // META_OCEAN_RENDERING_GLES_PROGRAM_MANAGER_H