Created branch for experimental blending mode API
See issue #298. Based on branch 'new_blending_api' of github.com:tomgalvin594/SFML.
This commit is contained in:
Jan Haller
commit
fe7d6f513d
4 changed files with 293 additions and 42 deletions
93
src/SFML/Graphics/BlendMode.cpp
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93
src/SFML/Graphics/BlendMode.cpp
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////////////////////////////////////////////////////////////
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//
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// SFML - Simple and Fast Multimedia Library
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// Copyright (C) 2007-2013 Laurent Gomila (laurent.gom@gmail.com)
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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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////////////////////////////////////////////////////////////
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// Headers
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////////////////////////////////////////////////////////////
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#include <SFML/Graphics/BlendMode.hpp>
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#include <SFML/Graphics/GLCheck.hpp>
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namespace sf
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{
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////////////////////////////////////////////////////////////
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// Commonly used blending modes
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////////////////////////////////////////////////////////////
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const BlendMode BlendAlpha(BlendMode::SrcAlpha, BlendMode::OneMinusSrcAlpha, BlendMode::Add,
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BlendMode::One, BlendMode::OneMinusSrcAlpha, BlendMode::Add);
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const BlendMode BlendAdd(BlendMode::SrcAlpha, BlendMode::One, BlendMode::Add,
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BlendMode::One, BlendMode::One, BlendMode::Add);
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const BlendMode BlendMultiply(BlendMode::DstColor, BlendMode::Zero, BlendMode::Add,
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BlendMode::DstColor, BlendMode::Zero, BlendMode::Add);
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const BlendMode BlendNone(BlendMode::One, BlendMode::Zero, BlendMode::Add,
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BlendMode::One, BlendMode::Zero, BlendMode::Add);
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////////////////////////////////////////////////////////////
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BlendMode::BlendMode() :
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colorSrcFactor(BlendMode::SrcAlpha),
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colorDstFactor(BlendMode::OneMinusSrcAlpha),
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colorEquation (BlendMode::Add),
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alphaSrcFactor(BlendMode::One),
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alphaDstFactor(BlendMode::OneMinusSrcAlpha),
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alphaEquation (BlendMode::Add)
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{
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}
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////////////////////////////////////////////////////////////
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BlendMode::BlendMode(BlendFactor colorSourceFactor, BlendFactor colorDstFactor,
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BlendEquation colorBlendEquation, BlendFactor alphaSourceFactor,
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BlendFactor alphaDstFactor, BlendEquation alphaBlendEquation) :
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colorSrcFactor(colorSourceFactor),
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colorDstFactor(colorDstFactor),
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colorEquation (colorBlendEquation),
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alphaSrcFactor(alphaSourceFactor),
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alphaDstFactor(alphaDstFactor),
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alphaEquation (alphaBlendEquation)
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{
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}
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////////////////////////////////////////////////////////////
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bool operator ==(const BlendMode& left, const BlendMode& right)
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{
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return (left.colorSrcFactor == right.colorSrcFactor) &&
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(left.colorDstFactor == right.colorDstFactor) &&
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(left.colorEquation == right.colorEquation) &&
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(left.alphaSrcFactor == right.alphaSrcFactor) &&
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(left.alphaDstFactor == right.alphaDstFactor) &&
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(left.alphaEquation == right.alphaEquation);
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}
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////////////////////////////////////////////////////////////
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bool operator !=(const BlendMode& left, const BlendMode& right)
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{
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return !(left == right);
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}
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} // namespace sf
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@ -4,6 +4,7 @@ set(SRCROOT ${PROJECT_SOURCE_DIR}/src/SFML/Graphics)
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# all source files
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set(SRC
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${SRCROOT}/BlendMode.cpp
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${INCROOT}/BlendMode.hpp
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${SRCROOT}/Color.cpp
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${INCROOT}/Color.hpp
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@ -86,15 +87,15 @@ source_group("stb_image" FILES ${STB_SRC})
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# let CMake know about our additional graphics libraries paths (on Windows and OSX)
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if(SFML_OS_WINDOWS OR SFML_OS_MACOSX)
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set(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} "${PROJECT_SOURCE_DIR}/extlibs/headers/jpeg")
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endif()
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endif()
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if(SFML_OS_WINDOWS)
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set(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} "${PROJECT_SOURCE_DIR}/extlibs/headers/libfreetype/windows")
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set(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} "${PROJECT_SOURCE_DIR}/extlibs/headers/libfreetype/windows/freetype")
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elseif(SFML_OS_MACOSX)
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set(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} "${PROJECT_SOURCE_DIR}/extlibs/headers/libfreetype/osx")
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set(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} "${PROJECT_SOURCE_DIR}/extlibs/headers/libfreetype/osx/freetype2")
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set(CMAKE_LIBRARY_PATH ${CMAKE_LIBRARY_PATH} "${PROJECT_SOURCE_DIR}/extlibs/libs-osx/Frameworks")
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set(CMAKE_LIBRARY_PATH ${CMAKE_LIBRARY_PATH} "${PROJECT_SOURCE_DIR}/extlibs/libs-osx/Frameworks")
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endif()
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# find external libraries
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@ -35,6 +35,41 @@
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#include <iostream>
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namespace
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{
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// Convert an sf::BlendMode::BlendFactor constant to the corresponding OpenGL constant.
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sf::Uint32 factorToGlConstant(sf::BlendMode::BlendFactor blendFactor)
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{
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switch (blendFactor)
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{
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default:
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case sf::BlendMode::Zero: return GL_ZERO;
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case sf::BlendMode::One: return GL_ONE;
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case sf::BlendMode::SrcColor: return GL_SRC_COLOR;
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case sf::BlendMode::OneMinusSrcColor: return GL_ONE_MINUS_SRC_COLOR;
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case sf::BlendMode::DstColor: return GL_DST_COLOR;
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case sf::BlendMode::OneMinusDstColor: return GL_ONE_MINUS_DST_COLOR;
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case sf::BlendMode::SrcAlpha: return GL_SRC_ALPHA;
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case sf::BlendMode::OneMinusSrcAlpha: return GL_ONE_MINUS_SRC_ALPHA;
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case sf::BlendMode::DstAlpha: return GL_DST_ALPHA;
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case sf::BlendMode::OneMinusDstAlpha: return GL_ONE_MINUS_DST_ALPHA;
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}
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}
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// Convert an sf::BlendMode::BlendEquation constant to the corresponding OpenGL constant.
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sf::Uint32 equationToGlConstant(sf::BlendMode::BlendEquation blendEquation)
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{
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switch (blendEquation)
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{
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default:
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case sf::BlendMode::Add: return GL_FUNC_ADD;
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case sf::BlendMode::Subtract: return GL_FUNC_SUBTRACT;
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}
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}
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}
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namespace sf
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{
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////////////////////////////////////////////////////////////
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@ -355,38 +390,20 @@ void RenderTarget::applyCurrentView()
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////////////////////////////////////////////////////////////
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void RenderTarget::applyBlendMode(BlendMode mode)
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{
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switch (mode)
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{
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// glBlendFuncSeparateEXT is used when available to avoid an incorrect alpha value when the target
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// is a RenderTexture -- in this case the alpha value must be written directly to the target buffer
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// Apply the blend mode, falling back to the non-separate versions if necessary
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if (GLEW_EXT_blend_func_separate)
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glCheck(glBlendFuncSeparateEXT(factorToGlConstant(mode.colorSrcFactor),
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factorToGlConstant(mode.colorDstFactor), factorToGlConstant(mode.alphaSrcFactor),
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factorToGlConstant(mode.alphaDstFactor)));
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else
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glCheck(glBlendFunc(factorToGlConstant(mode.colorSrcFactor),
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factorToGlConstant(mode.colorDstFactor)));
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// Alpha blending
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default :
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case BlendAlpha :
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if (GLEW_EXT_blend_func_separate)
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glCheck(glBlendFuncSeparateEXT(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA));
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else
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glCheck(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
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break;
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// Additive blending
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case BlendAdd :
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if (GLEW_EXT_blend_func_separate)
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glCheck(glBlendFuncSeparateEXT(GL_SRC_ALPHA, GL_ONE, GL_ONE, GL_ONE));
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else
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glCheck(glBlendFunc(GL_SRC_ALPHA, GL_ONE));
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break;
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// Multiplicative blending
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case BlendMultiply :
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glCheck(glBlendFunc(GL_DST_COLOR, GL_ZERO));
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break;
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// No blending
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case BlendNone :
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glCheck(glBlendFunc(GL_ONE, GL_ZERO));
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break;
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}
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if (GLEW_EXT_blend_equation_separate)
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glCheck(glBlendEquationSeparateEXT(equationToGlConstant(mode.colorEquation),
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equationToGlConstant(mode.alphaEquation)));
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else
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glCheck(glBlendEquation(equationToGlConstant(mode.colorEquation)));
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m_cache.lastBlendMode = mode;
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}
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@ -436,8 +453,9 @@ void RenderTarget::applyShader(const Shader* shader)
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// to render them.
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//
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// * Blending mode
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// It's a simple integral value, so we can easily check
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// whether the value to apply is the same as before or not.
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// Since it overloads the == operator, we can easily check
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// whether any of the 6 blending components changed and,
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// thus, whether we need to update the blend mode.
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//
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// * Texture
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// Storing the pointer or OpenGL ID of the last used texture
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