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876 lines
37 KiB
C++
876 lines
37 KiB
C++
////////////////////////////////////////////////////////////
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//
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// SFML - Simple and Fast Multimedia Library
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// Copyright (C) 2007-2016 Laurent Gomila (laurent@sfml-dev.org)
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//
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// This software is provided 'as-is', without any express or implied warranty.
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// In no event will the authors be held liable for any damages arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it freely,
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// subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented;
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// you must not claim that you wrote the original software.
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// If you use this software in a product, an acknowledgment
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// in the product documentation would be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such,
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// and must not be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source distribution.
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//
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////////////////////////////////////////////////////////////
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#ifndef SFML_SHADER_HPP
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#define SFML_SHADER_HPP
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////////////////////////////////////////////////////////////
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// Headers
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////////////////////////////////////////////////////////////
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#include <SFML/Graphics/Export.hpp>
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#include <SFML/Graphics/Glsl.hpp>
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#include <SFML/Window/GlResource.hpp>
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#include <SFML/System/NonCopyable.hpp>
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#include <SFML/System/Vector2.hpp>
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#include <SFML/System/Vector3.hpp>
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#include <map>
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#include <string>
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namespace sf
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{
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class Color;
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class InputStream;
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class Texture;
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class Transform;
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////////////////////////////////////////////////////////////
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/// \brief Shader class (vertex, geometry and fragment)
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///
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////////////////////////////////////////////////////////////
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class SFML_GRAPHICS_API Shader : GlResource, NonCopyable
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{
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public:
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////////////////////////////////////////////////////////////
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/// \brief Types of shaders
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///
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////////////////////////////////////////////////////////////
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enum Type
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{
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Vertex, ///< %Vertex shader
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Geometry, ///< Geometry shader
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Fragment ///< Fragment (pixel) shader
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};
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////////////////////////////////////////////////////////////
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/// \brief Special type that can be passed to setUniform(),
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/// and that represents the texture of the object being drawn
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///
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/// \see setUniform(const std::string&, CurrentTextureType)
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///
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////////////////////////////////////////////////////////////
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struct CurrentTextureType {};
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////////////////////////////////////////////////////////////
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/// \brief Represents the texture of the object being drawn
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///
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/// \see setUniform(const std::string&, CurrentTextureType)
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///
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////////////////////////////////////////////////////////////
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static CurrentTextureType CurrentTexture;
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public:
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////////////////////////////////////////////////////////////
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/// \brief Default constructor
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///
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/// This constructor creates an invalid shader.
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///
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////////////////////////////////////////////////////////////
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Shader();
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////////////////////////////////////////////////////////////
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/// \brief Destructor
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///
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////////////////////////////////////////////////////////////
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~Shader();
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////////////////////////////////////////////////////////////
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/// \brief Load the vertex, geometry or fragment shader from a file
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///
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/// This function loads a single shader, vertex, geometry or
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/// fragment, identified by the second argument.
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/// The source must be a text file containing a valid
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/// shader in GLSL language. GLSL is a C-like language
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/// dedicated to OpenGL shaders; you'll probably need to
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/// read a good documentation for it before writing your
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/// own shaders.
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///
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/// \param filename Path of the vertex, geometry or fragment shader file to load
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/// \param type Type of shader (vertex, geometry or fragment)
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///
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/// \return True if loading succeeded, false if it failed
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///
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/// \see loadFromMemory, loadFromStream
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///
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////////////////////////////////////////////////////////////
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bool loadFromFile(const std::string& filename, Type type);
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////////////////////////////////////////////////////////////
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/// \brief Load both the vertex and fragment shaders from files
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///
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/// This function loads both the vertex and the fragment
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/// shaders. If one of them fails to load, the shader is left
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/// empty (the valid shader is unloaded).
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/// The sources must be text files containing valid shaders
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/// in GLSL language. GLSL is a C-like language dedicated to
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/// OpenGL shaders; you'll probably need to read a good documentation
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/// for it before writing your own shaders.
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///
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/// \param vertexShaderFilename Path of the vertex shader file to load
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/// \param fragmentShaderFilename Path of the fragment shader file to load
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///
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/// \return True if loading succeeded, false if it failed
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///
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/// \see loadFromMemory, loadFromStream
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///
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////////////////////////////////////////////////////////////
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bool loadFromFile(const std::string& vertexShaderFilename, const std::string& fragmentShaderFilename);
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////////////////////////////////////////////////////////////
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/// \brief Load the vertex, geometry and fragment shaders from files
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///
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/// This function loads the vertex, geometry and fragment
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/// shaders. If one of them fails to load, the shader is left
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/// empty (the valid shader is unloaded).
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/// The sources must be text files containing valid shaders
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/// in GLSL language. GLSL is a C-like language dedicated to
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/// OpenGL shaders; you'll probably need to read a good documentation
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/// for it before writing your own shaders.
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///
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/// \param vertexShaderFilename Path of the vertex shader file to load
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/// \param geometryShaderFilename Path of the geometry shader file to load
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/// \param fragmentShaderFilename Path of the fragment shader file to load
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///
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/// \return True if loading succeeded, false if it failed
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///
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/// \see loadFromMemory, loadFromStream
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///
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////////////////////////////////////////////////////////////
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bool loadFromFile(const std::string& vertexShaderFilename, const std::string& geometryShaderFilename, const std::string& fragmentShaderFilename);
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////////////////////////////////////////////////////////////
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/// \brief Load the vertex, geometry or fragment shader from a source code in memory
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///
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/// This function loads a single shader, vertex, geometry
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/// or fragment, identified by the second argument.
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/// The source code must be a valid shader in GLSL language.
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/// GLSL is a C-like language dedicated to OpenGL shaders;
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/// you'll probably need to read a good documentation for
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/// it before writing your own shaders.
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///
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/// \param shader String containing the source code of the shader
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/// \param type Type of shader (vertex, geometry or fragment)
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///
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/// \return True if loading succeeded, false if it failed
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///
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/// \see loadFromFile, loadFromStream
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///
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////////////////////////////////////////////////////////////
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bool loadFromMemory(const std::string& shader, Type type);
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////////////////////////////////////////////////////////////
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/// \brief Load both the vertex and fragment shaders from source codes in memory
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///
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/// This function loads both the vertex and the fragment
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/// shaders. If one of them fails to load, the shader is left
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/// empty (the valid shader is unloaded).
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/// The sources must be valid shaders in GLSL language. GLSL is
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/// a C-like language dedicated to OpenGL shaders; you'll
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/// probably need to read a good documentation for it before
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/// writing your own shaders.
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///
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/// \param vertexShader String containing the source code of the vertex shader
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/// \param fragmentShader String containing the source code of the fragment shader
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///
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/// \return True if loading succeeded, false if it failed
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///
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/// \see loadFromFile, loadFromStream
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///
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////////////////////////////////////////////////////////////
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bool loadFromMemory(const std::string& vertexShader, const std::string& fragmentShader);
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////////////////////////////////////////////////////////////
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/// \brief Load the vertex, geometry and fragment shaders from source codes in memory
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///
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/// This function loads the vertex, geometry and fragment
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/// shaders. If one of them fails to load, the shader is left
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/// empty (the valid shader is unloaded).
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/// The sources must be valid shaders in GLSL language. GLSL is
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/// a C-like language dedicated to OpenGL shaders; you'll
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/// probably need to read a good documentation for it before
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/// writing your own shaders.
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///
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/// \param vertexShader String containing the source code of the vertex shader
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/// \param geometryShader String containing the source code of the geometry shader
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/// \param fragmentShader String containing the source code of the fragment shader
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///
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/// \return True if loading succeeded, false if it failed
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///
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/// \see loadFromFile, loadFromStream
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///
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////////////////////////////////////////////////////////////
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bool loadFromMemory(const std::string& vertexShader, const std::string& geometryShader, const std::string& fragmentShader);
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////////////////////////////////////////////////////////////
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/// \brief Load the vertex, geometry or fragment shader from a custom stream
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///
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/// This function loads a single shader, vertex, geometry
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/// or fragment, identified by the second argument.
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/// The source code must be a valid shader in GLSL language.
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/// GLSL is a C-like language dedicated to OpenGL shaders;
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/// you'll probably need to read a good documentation for it
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/// before writing your own shaders.
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///
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/// \param stream Source stream to read from
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/// \param type Type of shader (vertex, geometry or fragment)
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///
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/// \return True if loading succeeded, false if it failed
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///
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/// \see loadFromFile, loadFromMemory
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///
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////////////////////////////////////////////////////////////
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bool loadFromStream(InputStream& stream, Type type);
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////////////////////////////////////////////////////////////
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/// \brief Load both the vertex and fragment shaders from custom streams
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///
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/// This function loads both the vertex and the fragment
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/// shaders. If one of them fails to load, the shader is left
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/// empty (the valid shader is unloaded).
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/// The source codes must be valid shaders in GLSL language.
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/// GLSL is a C-like language dedicated to OpenGL shaders;
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/// you'll probably need to read a good documentation for
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/// it before writing your own shaders.
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///
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/// \param vertexShaderStream Source stream to read the vertex shader from
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/// \param fragmentShaderStream Source stream to read the fragment shader from
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///
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/// \return True if loading succeeded, false if it failed
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///
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/// \see loadFromFile, loadFromMemory
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///
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////////////////////////////////////////////////////////////
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bool loadFromStream(InputStream& vertexShaderStream, InputStream& fragmentShaderStream);
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////////////////////////////////////////////////////////////
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/// \brief Load the vertex, geometry and fragment shaders from custom streams
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///
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/// This function loads the vertex, geometry and fragment
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/// shaders. If one of them fails to load, the shader is left
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/// empty (the valid shader is unloaded).
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/// The source codes must be valid shaders in GLSL language.
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/// GLSL is a C-like language dedicated to OpenGL shaders;
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/// you'll probably need to read a good documentation for
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/// it before writing your own shaders.
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///
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/// \param vertexShaderStream Source stream to read the vertex shader from
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/// \param geometryShaderStream Source stream to read the geometry shader from
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/// \param fragmentShaderStream Source stream to read the fragment shader from
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///
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/// \return True if loading succeeded, false if it failed
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///
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/// \see loadFromFile, loadFromMemory
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///
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////////////////////////////////////////////////////////////
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bool loadFromStream(InputStream& vertexShaderStream, InputStream& geometryShaderStream, InputStream& fragmentShaderStream);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p float uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param x Value of the float scalar
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, float x);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p vec2 uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param vector Value of the vec2 vector
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, const Glsl::Vec2& vector);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p vec3 uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param vector Value of the vec3 vector
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, const Glsl::Vec3& vector);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p vec4 uniform
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///
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/// This overload can also be called with sf::Color objects
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/// that are converted to sf::Glsl::Vec4.
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///
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/// It is important to note that the components of the color are
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/// normalized before being passed to the shader. Therefore,
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/// they are converted from range [0 .. 255] to range [0 .. 1].
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/// For example, a sf::Color(255, 127, 0, 255) will be transformed
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/// to a vec4(1.0, 0.5, 0.0, 1.0) in the shader.
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param vector Value of the vec4 vector
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, const Glsl::Vec4& vector);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p int uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param x Value of the int scalar
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, int x);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p ivec2 uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param vector Value of the ivec2 vector
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, const Glsl::Ivec2& vector);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p ivec3 uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param vector Value of the ivec3 vector
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, const Glsl::Ivec3& vector);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p ivec4 uniform
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///
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/// This overload can also be called with sf::Color objects
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/// that are converted to sf::Glsl::Ivec4.
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///
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/// If color conversions are used, the ivec4 uniform in GLSL
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/// will hold the same values as the original sf::Color
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/// instance. For example, sf::Color(255, 127, 0, 255) is
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/// mapped to ivec4(255, 127, 0, 255).
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param vector Value of the ivec4 vector
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, const Glsl::Ivec4& vector);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p bool uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param x Value of the bool scalar
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, bool x);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p bvec2 uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param vector Value of the bvec2 vector
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, const Glsl::Bvec2& vector);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p bvec3 uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param vector Value of the bvec3 vector
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, const Glsl::Bvec3& vector);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p bvec4 uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param vector Value of the bvec4 vector
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, const Glsl::Bvec4& vector);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p mat3 matrix
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param matrix Value of the mat3 matrix
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, const Glsl::Mat3& matrix);
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////////////////////////////////////////////////////////////
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/// \brief Specify value for \p mat4 matrix
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param matrix Value of the mat4 matrix
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, const Glsl::Mat4& matrix);
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////////////////////////////////////////////////////////////
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/// \brief Specify a texture as \p sampler2D uniform
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///
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/// \a name is the name of the variable to change in the shader.
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/// The corresponding parameter in the shader must be a 2D texture
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/// (\p sampler2D GLSL type).
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///
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/// Example:
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/// \code
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/// uniform sampler2D the_texture; // this is the variable in the shader
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/// \endcode
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/// \code
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/// sf::Texture texture;
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/// ...
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/// shader.setUniform("the_texture", texture);
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/// \endcode
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/// It is important to note that \a texture must remain alive as long
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/// as the shader uses it, no copy is made internally.
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///
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/// To use the texture of the object being drawn, which cannot be
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/// known in advance, you can pass the special value
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/// sf::Shader::CurrentTexture:
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/// \code
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/// shader.setUniform("the_texture", sf::Shader::CurrentTexture).
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/// \endcode
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///
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/// \param name Name of the texture in the shader
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/// \param texture Texture to assign
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, const Texture& texture);
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////////////////////////////////////////////////////////////
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/// \brief Specify current texture as \p sampler2D uniform
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///
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/// This overload maps a shader texture variable to the
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/// texture of the object being drawn, which cannot be
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/// known in advance. The second argument must be
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/// sf::Shader::CurrentTexture.
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/// The corresponding parameter in the shader must be a 2D texture
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/// (\p sampler2D GLSL type).
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///
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/// Example:
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/// \code
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/// uniform sampler2D current; // this is the variable in the shader
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/// \endcode
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/// \code
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/// shader.setUniform("current", sf::Shader::CurrentTexture);
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/// \endcode
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///
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/// \param name Name of the texture in the shader
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///
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////////////////////////////////////////////////////////////
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void setUniform(const std::string& name, CurrentTextureType);
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////////////////////////////////////////////////////////////
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/// \brief Specify values for \p float[] array uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param scalarArray pointer to array of \p float values
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/// \param length Number of elements in the array
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///
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////////////////////////////////////////////////////////////
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void setUniformArray(const std::string& name, const float* scalarArray, std::size_t length);
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////////////////////////////////////////////////////////////
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/// \brief Specify values for \p vec2[] array uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param vectorArray pointer to array of \p vec2 values
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/// \param length Number of elements in the array
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///
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////////////////////////////////////////////////////////////
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void setUniformArray(const std::string& name, const Glsl::Vec2* vectorArray, std::size_t length);
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////////////////////////////////////////////////////////////
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/// \brief Specify values for \p vec3[] array uniform
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///
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/// \param name Name of the uniform variable in GLSL
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/// \param vectorArray pointer to array of \p vec3 values
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/// \param length Number of elements in the array
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
void setUniformArray(const std::string& name, const Glsl::Vec3* vectorArray, std::size_t length);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Specify values for \p vec4[] array uniform
|
|
///
|
|
/// \param name Name of the uniform variable in GLSL
|
|
/// \param vectorArray pointer to array of \p vec4 values
|
|
/// \param length Number of elements in the array
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
void setUniformArray(const std::string& name, const Glsl::Vec4* vectorArray, std::size_t length);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Specify values for \p mat3[] array uniform
|
|
///
|
|
/// \param name Name of the uniform variable in GLSL
|
|
/// \param matrixArray pointer to array of \p mat3 values
|
|
/// \param length Number of elements in the array
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
void setUniformArray(const std::string& name, const Glsl::Mat3* matrixArray, std::size_t length);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Specify values for \p mat4[] array uniform
|
|
///
|
|
/// \param name Name of the uniform variable in GLSL
|
|
/// \param matrixArray pointer to array of \p mat4 values
|
|
/// \param length Number of elements in the array
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
void setUniformArray(const std::string& name, const Glsl::Mat4* matrixArray, std::size_t length);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Change a float parameter of the shader
|
|
///
|
|
/// \deprecated Use setUniform(const std::string&, float) instead.
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
SFML_DEPRECATED void setParameter(const std::string& name, float x);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Change a 2-components vector parameter of the shader
|
|
///
|
|
/// \deprecated Use setUniform(const std::string&, const Glsl::Vec2&) instead.
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
SFML_DEPRECATED void setParameter(const std::string& name, float x, float y);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Change a 3-components vector parameter of the shader
|
|
///
|
|
/// \deprecated Use setUniform(const std::string&, const Glsl::Vec3&) instead.
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
SFML_DEPRECATED void setParameter(const std::string& name, float x, float y, float z);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Change a 4-components vector parameter of the shader
|
|
///
|
|
/// \deprecated Use setUniform(const std::string&, const Glsl::Vec4&) instead.
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
SFML_DEPRECATED void setParameter(const std::string& name, float x, float y, float z, float w);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Change a 2-components vector parameter of the shader
|
|
///
|
|
/// \deprecated Use setUniform(const std::string&, const Glsl::Vec2&) instead.
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
SFML_DEPRECATED void setParameter(const std::string& name, const Vector2f& vector);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Change a 3-components vector parameter of the shader
|
|
///
|
|
/// \deprecated Use setUniform(const std::string&, const Glsl::Vec3&) instead.
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
SFML_DEPRECATED void setParameter(const std::string& name, const Vector3f& vector);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Change a color parameter of the shader
|
|
///
|
|
/// \deprecated Use setUniform(const std::string&, const Glsl::Vec4&) instead.
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
SFML_DEPRECATED void setParameter(const std::string& name, const Color& color);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Change a matrix parameter of the shader
|
|
///
|
|
/// \deprecated Use setUniform(const std::string&, const Glsl::Mat4&) instead.
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
SFML_DEPRECATED void setParameter(const std::string& name, const Transform& transform);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Change a texture parameter of the shader
|
|
///
|
|
/// \deprecated Use setUniform(const std::string&, const Texture&) instead.
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
SFML_DEPRECATED void setParameter(const std::string& name, const Texture& texture);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Change a texture parameter of the shader
|
|
///
|
|
/// \deprecated Use setUniform(const std::string&, CurrentTextureType) instead.
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
SFML_DEPRECATED void setParameter(const std::string& name, CurrentTextureType);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Get the underlying OpenGL handle of the shader.
|
|
///
|
|
/// You shouldn't need to use this function, unless you have
|
|
/// very specific stuff to implement that SFML doesn't support,
|
|
/// or implement a temporary workaround until a bug is fixed.
|
|
///
|
|
/// \return OpenGL handle of the shader or 0 if not yet loaded
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
unsigned int getNativeHandle() const;
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Bind a shader for rendering
|
|
///
|
|
/// This function is not part of the graphics API, it mustn't be
|
|
/// used when drawing SFML entities. It must be used only if you
|
|
/// mix sf::Shader with OpenGL code.
|
|
///
|
|
/// \code
|
|
/// sf::Shader s1, s2;
|
|
/// ...
|
|
/// sf::Shader::bind(&s1);
|
|
/// // draw OpenGL stuff that use s1...
|
|
/// sf::Shader::bind(&s2);
|
|
/// // draw OpenGL stuff that use s2...
|
|
/// sf::Shader::bind(NULL);
|
|
/// // draw OpenGL stuff that use no shader...
|
|
/// \endcode
|
|
///
|
|
/// \param shader Shader to bind, can be null to use no shader
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
static void bind(const Shader* shader);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Tell whether or not the system supports shaders
|
|
///
|
|
/// This function should always be called before using
|
|
/// the shader features. If it returns false, then
|
|
/// any attempt to use sf::Shader will fail.
|
|
///
|
|
/// \return True if shaders are supported, false otherwise
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
static bool isAvailable();
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Tell whether or not the system supports geometry shaders
|
|
///
|
|
/// This function should always be called before using
|
|
/// the geometry shader features. If it returns false, then
|
|
/// any attempt to use sf::Shader geometry shader features will fail.
|
|
///
|
|
/// This function can only return true if isAvailable() would also
|
|
/// return true, since shaders in general have to be supported in
|
|
/// order for geometry shaders to be supported as well.
|
|
///
|
|
/// Note: The first call to this function, whether by your
|
|
/// code or SFML will result in a context switch.
|
|
///
|
|
/// \return True if geometry shaders are supported, false otherwise
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
static bool isGeometryAvailable();
|
|
|
|
private:
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Compile the shader(s) and create the program
|
|
///
|
|
/// If one of the arguments is NULL, the corresponding shader
|
|
/// is not created.
|
|
///
|
|
/// \param vertexShaderCode Source code of the vertex shader
|
|
/// \param geometryShaderCode Source code of the geometry shader
|
|
/// \param fragmentShaderCode Source code of the fragment shader
|
|
///
|
|
/// \return True on success, false if any error happened
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
bool compile(const char* vertexShaderCode, const char* geometryShaderCode, const char* fragmentShaderCode);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Bind all the textures used by the shader
|
|
///
|
|
/// This function each texture to a different unit, and
|
|
/// updates the corresponding variables in the shader accordingly.
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
void bindTextures() const;
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief Get the location ID of a shader uniform
|
|
///
|
|
/// \param name Name of the uniform variable to search
|
|
///
|
|
/// \return Location ID of the uniform, or -1 if not found
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
int getUniformLocation(const std::string& name);
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \brief RAII object to save and restore the program
|
|
/// binding while uniforms are being set
|
|
///
|
|
/// Implementation is private in the .cpp file.
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
struct UniformBinder;
|
|
|
|
////////////////////////////////////////////////////////////
|
|
// Types
|
|
////////////////////////////////////////////////////////////
|
|
typedef std::map<int, const Texture*> TextureTable;
|
|
typedef std::map<std::string, int> UniformTable;
|
|
|
|
////////////////////////////////////////////////////////////
|
|
// Member data
|
|
////////////////////////////////////////////////////////////
|
|
unsigned int m_shaderProgram; ///< OpenGL identifier for the program
|
|
int m_currentTexture; ///< Location of the current texture in the shader
|
|
TextureTable m_textures; ///< Texture variables in the shader, mapped to their location
|
|
UniformTable m_uniforms; ///< Parameters location cache
|
|
};
|
|
|
|
} // namespace sf
|
|
|
|
|
|
#endif // SFML_SHADER_HPP
|
|
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// \class sf::Shader
|
|
/// \ingroup graphics
|
|
///
|
|
/// Shaders are programs written using a specific language,
|
|
/// executed directly by the graphics card and allowing
|
|
/// to apply real-time operations to the rendered entities.
|
|
///
|
|
/// There are three kinds of shaders:
|
|
/// \li %Vertex shaders, that process vertices
|
|
/// \li Geometry shaders, that process primitives
|
|
/// \li Fragment (pixel) shaders, that process pixels
|
|
///
|
|
/// A sf::Shader can be composed of either a vertex shader
|
|
/// alone, a geometry shader alone, a fragment shader alone,
|
|
/// or any combination of them. (see the variants of the
|
|
/// load functions).
|
|
///
|
|
/// Shaders are written in GLSL, which is a C-like
|
|
/// language dedicated to OpenGL shaders. You'll probably
|
|
/// need to learn its basics before writing your own shaders
|
|
/// for SFML.
|
|
///
|
|
/// Like any C/C++ program, a GLSL shader has its own variables
|
|
/// called \a uniforms that you can set from your C++ application.
|
|
/// sf::Shader handles different types of uniforms:
|
|
/// \li scalars: \p float, \p int, \p bool
|
|
/// \li vectors (2, 3 or 4 components)
|
|
/// \li matrices (3x3 or 4x4)
|
|
/// \li samplers (textures)
|
|
///
|
|
/// Some SFML-specific types can be converted:
|
|
/// \li sf::Color as a 4D vector (\p vec4)
|
|
/// \li sf::Transform as matrices (\p mat3 or \p mat4)
|
|
///
|
|
/// Every uniform variable in a shader can be set through one of the
|
|
/// setUniform() or setUniformArray() overloads. For example, if you
|
|
/// have a shader with the following uniforms:
|
|
/// \code
|
|
/// uniform float offset;
|
|
/// uniform vec3 point;
|
|
/// uniform vec4 color;
|
|
/// uniform mat4 matrix;
|
|
/// uniform sampler2D overlay;
|
|
/// uniform sampler2D current;
|
|
/// \endcode
|
|
/// You can set their values from C++ code as follows, using the types
|
|
/// defined in the sf::Glsl namespace:
|
|
/// \code
|
|
/// shader.setUniform("offset", 2.f);
|
|
/// shader.setUniform("point", sf::Vector3f(0.5f, 0.8f, 0.3f));
|
|
/// shader.setUniform("color", sf::Glsl::Vec4(color)); // color is a sf::Color
|
|
/// shader.setUniform("matrix", sf::Glsl::Mat4(transform)); // transform is a sf::Transform
|
|
/// shader.setUniform("overlay", texture); // texture is a sf::Texture
|
|
/// shader.setUniform("current", sf::Shader::CurrentTexture);
|
|
/// \endcode
|
|
///
|
|
/// The old setParameter() overloads are deprecated and will be removed in a
|
|
/// future version. You should use their setUniform() equivalents instead.
|
|
///
|
|
/// The special Shader::CurrentTexture argument maps the
|
|
/// given \p sampler2D uniform to the current texture of the
|
|
/// object being drawn (which cannot be known in advance).
|
|
///
|
|
/// To apply a shader to a drawable, you must pass it as an
|
|
/// additional parameter to the \ref Window::draw() draw() function:
|
|
/// \code
|
|
/// window.draw(sprite, &shader);
|
|
/// \endcode
|
|
///
|
|
/// ... which is in fact just a shortcut for this:
|
|
/// \code
|
|
/// sf::RenderStates states;
|
|
/// states.shader = &shader;
|
|
/// window.draw(sprite, states);
|
|
/// \endcode
|
|
///
|
|
/// In the code above we pass a pointer to the shader, because it may
|
|
/// be null (which means "no shader").
|
|
///
|
|
/// Shaders can be used on any drawable, but some combinations are
|
|
/// not interesting. For example, using a vertex shader on a sf::Sprite
|
|
/// is limited because there are only 4 vertices, the sprite would
|
|
/// have to be subdivided in order to apply wave effects.
|
|
/// Another bad example is a fragment shader with sf::Text: the texture
|
|
/// of the text is not the actual text that you see on screen, it is
|
|
/// a big texture containing all the characters of the font in an
|
|
/// arbitrary order; thus, texture lookups on pixels other than the
|
|
/// current one may not give you the expected result.
|
|
///
|
|
/// Shaders can also be used to apply global post-effects to the
|
|
/// current contents of the target (like the old sf::PostFx class
|
|
/// in SFML 1). This can be done in two different ways:
|
|
/// \li draw everything to a sf::RenderTexture, then draw it to
|
|
/// the main target using the shader
|
|
/// \li draw everything directly to the main target, then use
|
|
/// sf::Texture::update(Window&) to copy its contents to a texture
|
|
/// and draw it to the main target using the shader
|
|
///
|
|
/// The first technique is more optimized because it doesn't involve
|
|
/// retrieving the target's pixels to system memory, but the
|
|
/// second one doesn't impact the rendering process and can be
|
|
/// easily inserted anywhere without impacting all the code.
|
|
///
|
|
/// Like sf::Texture that can be used as a raw OpenGL texture,
|
|
/// sf::Shader can also be used directly as a raw shader for
|
|
/// custom OpenGL geometry.
|
|
/// \code
|
|
/// sf::Shader::bind(&shader);
|
|
/// ... render OpenGL geometry ...
|
|
/// sf::Shader::bind(NULL);
|
|
/// \endcode
|
|
///
|
|
/// \see sf::Glsl
|
|
///
|
|
////////////////////////////////////////////////////////////
|