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comparison engine/core/video/opengl/renderbackendopengl.cpp @ 634:5f381fa34769

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* Added the clearBackBuffer() function to the renderbackends. * Renamed setClearScreen() to setClearBackBuffer() * The SDL render backend now honors what was set with setClearBackBuffer() * Documented testRenderedViewPort() * The OpenGL backend no longer clears the screen every frame by default. testRenderedViewPort() takes care of clearing the screen for now. Note: if the user overrides the default and enables clearing of the backbuffer that it may be cleared twice in one frame (OpenGL only)!
author prock@33b003aa-7bff-0310-803a-e67f0ece8222
date Wed, 06 Oct 2010 15:49:53 +0000
parents 46b95d06c8c2
children 855ad500f991
comparison
equal deleted inserted replaced
633:46b95d06c8c2 634:5f381fa34769
41 SDL_Surface* testsurface = SDL_CreateRGBSurface(SDL_SWSURFACE | SDL_SRCALPHA, 1, 1, 32, 41 SDL_Surface* testsurface = SDL_CreateRGBSurface(SDL_SWSURFACE | SDL_SRCALPHA, 1, 1, 32,
42 RMASK, GMASK, BMASK ,AMASK); 42 RMASK, GMASK, BMASK ,AMASK);
43 43
44 m_rgba_format = *(testsurface->format); 44 m_rgba_format = *(testsurface->format);
45 SDL_FreeSurface(testsurface); 45 SDL_FreeSurface(testsurface);
46 m_clear = true; 46 m_clear = false;
47 } 47 }
48 48
49 const std::string& RenderBackendOpenGL::getName() const { 49 const std::string& RenderBackendOpenGL::getName() const {
50 static std::string backend_name = "OpenGL"; 50 static std::string backend_name = "OpenGL";
51 return backend_name; 51 return backend_name;
60 if (SDL_InitSubSystem(flags) < 0) 60 if (SDL_InitSubSystem(flags) < 0)
61 throw SDLException(SDL_GetError()); 61 throw SDLException(SDL_GetError());
62 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); 62 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
63 63
64 SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL); // temporary hack 64 SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL); // temporary hack
65 }
66
67 void RenderBackendOpenGL::clearBackBuffer() {
68 GLDisable flag(GL_SCISSOR_TEST);
69 glClear(GL_COLOR_BUFFER_BIT);
65 } 70 }
66 71
67 Image* RenderBackendOpenGL::createMainScreen(unsigned int width, unsigned int height, unsigned char bitsPerPixel, bool fs, const std::string& title, const std::string& icon) { 72 Image* RenderBackendOpenGL::createMainScreen(unsigned int width, unsigned int height, unsigned char bitsPerPixel, bool fs, const std::string& title, const std::string& icon) {
68 delete m_screen; 73 delete m_screen;
69 m_screen = 0; 74 m_screen = 0;
132 return m_screen; 137 return m_screen;
133 } 138 }
134 139
135 void RenderBackendOpenGL::startFrame() { 140 void RenderBackendOpenGL::startFrame() {
136 if(m_clear) { 141 if(m_clear) {
137 GLDisable flag(GL_SCISSOR_TEST); 142 clearBackBuffer();
138 glClear(GL_COLOR_BUFFER_BIT);
139 } 143 }
140 } 144 }
141 145
142 void RenderBackendOpenGL::endFrame() { 146 void RenderBackendOpenGL::endFrame() {
143 SDL_GL_SwapBuffers(); 147 SDL_GL_SwapBuffers();