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Hash : d76c2cc1
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Date : 2014-01-30T12:30:40
Add a new hint SDL_HINT_VIDEO_WINDOW_SHARE_PIXEL_FORMAT that allows SDL_CreateWindowFrom() to set the pixel format of another SDL_Window (and also will set the SDL_WINDOW_OPENGL flag on the window created with SDL_CreateWindowFrom()). The reasoning behind this change is that source2 in -tools mode has a single OpenGL context that is used with multiple different windows. Some of those windows are created outside the engine (i.e. with Qt) and therefore we need to use SDL_CreateWindowFrom() to get an SDL_Window for those. The requirement for sharing an OpenGL context across multiple different windows is that each window has the same pixel format. To facilitate this, I now set SDL_HINT_VIDEO_WINDOW_SHARE_PIXEL_FORMAT for the main window before calling SDL_CreateWindowFrom(). When I do this, SDL_CreateWindowFrom() will: 1. Set the pixel format of the returned window to the same pixel format as this SDL_Window passed in with the hint 2. The flag SDL_WINDOW_OPENGL will be set on the new window so it can be used for OpenGL rendering. I only currently implemented this for Win32/WGL so implementing it for other platforms (i.e. X11) remains a TODO. CR: SamL Some pseudocode that shows how this is used in Source2: HWND hExternalHwnd; // HWND that was established outside of SDL // Create main window (happens inside platwindow.cpp) SDL_Window *mainWindow = SDL_CreateWindow( , SDL_WINDOW_OPENGL .. ); // Create GL context, happens inside rendersystemgl SDL_GLContext onlyContext = SDL_GL_CreateContext( mainWindow ); // Now I need to create another window from hEternalHwnd for my swap chain that will have the same pixel format as mainWindow, so set the hint SDL_SetHint( SDL_HINT_VIDEO_WINDOW_SHARE_PIXEL_FORMAT, CFmtStr( %p, mainWindow) ); // Create the secondary window. This returned window will have SDL_WINDOW_OPENGL set and share a pixel format with mainWindow from the hint SDL_Window *secondaryWindow = SDL_CreateWindowFrom( hExternalHwnd ); // To render to the main window: SDL_GL_MakeCurrent( mainWindow, onlyContext ); // Do some rendering to main window // To render to the secondary window: SDL_GLMakeCurrent( secondaryWindow, onlyContext ); // Do some rendering to secondary window
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Files
- SDL.h
- SDL_assert.h
- SDL_atomic.h
- SDL_audio.h
- SDL_bits.h
- SDL_blendmode.h
- SDL_clipboard.h
- SDL_config.h
- SDL_config.h.cmake
- SDL_config.h.in
- SDL_config_android.h
- SDL_config_iphoneos.h
- SDL_config_macosx.h
- SDL_config_minimal.h
- SDL_config_pandora.h
- SDL_config_psp.h
- SDL_config_windows.h
- SDL_config_wiz.h
- SDL_copying.h
- SDL_cpuinfo.h
- SDL_egl.h
- SDL_endian.h
- SDL_error.h
- SDL_events.h
- SDL_filesystem.h
- SDL_gamecontroller.h
- SDL_gesture.h
- SDL_haptic.h
- SDL_hints.h
- SDL_joystick.h
- SDL_keyboard.h
- SDL_keycode.h
- SDL_loadso.h
- SDL_log.h
- SDL_main.h
- SDL_messagebox.h
- SDL_mouse.h
- SDL_mutex.h
- SDL_name.h
- SDL_opengl.h
- SDL_opengles.h
- SDL_opengles2.h
- SDL_pixels.h
- SDL_platform.h
- SDL_power.h
- SDL_quit.h
- SDL_rect.h
- SDL_render.h
- SDL_revision.h
- SDL_rwops.h
- SDL_scancode.h
- SDL_shape.h
- SDL_stdinc.h
- SDL_surface.h
- SDL_system.h
- SDL_syswm.h
- SDL_test.h
- SDL_test_assert.h
- SDL_test_common.h
- SDL_test_compare.h
- SDL_test_crc32.h
- SDL_test_font.h
- SDL_test_fuzzer.h
- SDL_test_harness.h
- SDL_test_images.h
- SDL_test_log.h
- SDL_test_md5.h
- SDL_test_random.h
- SDL_thread.h
- SDL_timer.h
- SDL_touch.h
- SDL_types.h
- SDL_version.h
- SDL_video.h
- begin_code.h
- close_code.h
- doxyfile
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