| //======================================================================== |
| // GLFW - An OpenGL library |
| // Platform: EGL |
| // API version: 3.0 |
| // WWW: http://www.glfw.org/ |
| //------------------------------------------------------------------------ |
| // Copyright (c) 2002-2006 Marcus Geelnard |
| // Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org> |
| // |
| // This software is provided 'as-is', without any express or implied |
| // warranty. In no event will the authors be held liable for any damages |
| // arising from the use of this software. |
| // |
| // Permission is granted to anyone to use this software for any purpose, |
| // including commercial applications, and to alter it and redistribute it |
| // freely, subject to the following restrictions: |
| // |
| // 1. The origin of this software must not be misrepresented; you must not |
| // claim that you wrote the original software. If you use this software |
| // in a product, an acknowledgment in the product documentation would |
| // be appreciated but is not required. |
| // |
| // 2. Altered source versions must be plainly marked as such, and must not |
| // be misrepresented as being the original software. |
| // |
| // 3. This notice may not be removed or altered from any source |
| // distribution. |
| // |
| //======================================================================== |
| |
| #include "internal.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| |
| //======================================================================== |
| // Thread local storage attribute macro |
| //======================================================================== |
| #if defined(_MSC_VER) |
| #define _GLFW_TLS __declspec(thread) |
| #elif defined(__GNUC__) |
| #define _GLFW_TLS __thread |
| #else |
| #define _GLFW_TLS |
| #endif |
| |
| |
| //======================================================================== |
| // The per-thread current context/window pointer |
| //======================================================================== |
| static _GLFW_TLS _GLFWwindow* _glfwCurrentWindow = NULL; |
| |
| |
| //======================================================================== |
| // Returns the specified attribute of the specified EGLConfig |
| //======================================================================== |
| |
| static int getConfigAttrib(EGLConfig config, int attrib) |
| { |
| int value; |
| eglGetConfigAttrib(_glfwLibrary.EGL.display, config, attrib, &value); |
| return value; |
| } |
| |
| |
| //======================================================================== |
| // Return a list of available and usable framebuffer configs |
| //======================================================================== |
| |
| static _GLFWfbconfig* getFBConfigs(_GLFWwindow* window, |
| const _GLFWwndconfig* wndconfig, |
| unsigned int* found) |
| { |
| EGLConfig* configs; |
| _GLFWfbconfig* result; |
| int i, count = 0; |
| |
| *found = 0; |
| |
| eglGetConfigs(_glfwLibrary.EGL.display, NULL, 0, &count); |
| |
| configs = (EGLConfig*) malloc(sizeof(EGLConfig) * count); |
| if (!configs) |
| { |
| _glfwSetError(GLFW_OUT_OF_MEMORY, NULL); |
| return NULL; |
| } |
| |
| eglGetConfigs(_glfwLibrary.EGL.display, configs, count, &count); |
| if (!count) |
| { |
| free(configs); |
| |
| _glfwSetError(GLFW_API_UNAVAILABLE, |
| "EGL: No EGLConfigs returned"); |
| return NULL; |
| } |
| |
| result = (_GLFWfbconfig*) malloc(sizeof(_GLFWfbconfig) * count); |
| if (!result) |
| { |
| free(configs); |
| |
| _glfwSetError(GLFW_OUT_OF_MEMORY, NULL); |
| return NULL; |
| } |
| |
| for (i = 0; i < count; i++) |
| { |
| _GLFWfbconfig* f = result + *found; |
| |
| if (!getConfigAttrib(configs[i], EGL_NATIVE_VISUAL_ID)) |
| { |
| // Only consider EGLConfigs with associated visuals |
| continue; |
| } |
| |
| if (!(getConfigAttrib(configs[i], EGL_COLOR_BUFFER_TYPE) & EGL_RGB_BUFFER)) |
| { |
| // Only consider RGB(A) EGLConfigs |
| continue; |
| } |
| |
| if (!(getConfigAttrib(configs[i], EGL_SURFACE_TYPE) & EGL_WINDOW_BIT)) |
| { |
| // Only consider window EGLConfigs |
| continue; |
| } |
| |
| if (wndconfig->clientAPI == GLFW_OPENGL_ES_API) |
| { |
| if (wndconfig->glMajor == 1) |
| { |
| if (!(getConfigAttrib(configs[i], EGL_RENDERABLE_TYPE) & EGL_OPENGL_ES_BIT)) |
| continue; |
| } |
| else |
| { |
| if (!(getConfigAttrib(configs[i], EGL_RENDERABLE_TYPE) & EGL_OPENGL_ES2_BIT)) |
| continue; |
| } |
| } |
| else if (wndconfig->clientAPI == GLFW_OPENGL_API) |
| { |
| if (!(getConfigAttrib(configs[i], EGL_RENDERABLE_TYPE) & EGL_OPENGL_BIT)) |
| continue; |
| } |
| |
| f->redBits = getConfigAttrib(configs[i], EGL_RED_SIZE); |
| f->greenBits = getConfigAttrib(configs[i], EGL_GREEN_SIZE); |
| f->blueBits = getConfigAttrib(configs[i], EGL_BLUE_SIZE); |
| |
| f->alphaBits = getConfigAttrib(configs[i], EGL_ALPHA_SIZE); |
| f->depthBits = getConfigAttrib(configs[i], EGL_DEPTH_SIZE); |
| f->stencilBits = getConfigAttrib(configs[i], EGL_STENCIL_SIZE); |
| |
| f->samples = getConfigAttrib(configs[i], EGL_SAMPLES); |
| |
| // NOTE: There does not appear to be any way to request sRGB |
| // framebuffers for OpenGL or GLES contexts; only for OpenVG ones |
| f->sRGB = GL_FALSE; |
| |
| f->platformID = (GLFWintptr) getConfigAttrib(configs[i], EGL_CONFIG_ID); |
| |
| (*found)++; |
| } |
| |
| free(configs); |
| return result; |
| } |
| |
| |
| //======================================================================== |
| // Create the actual OpenGL(|ES) context |
| //======================================================================== |
| |
| #define setEGLattrib(attribs, index, attribName, attribValue) \ |
| { \ |
| attribs[index++] = attribName; \ |
| attribs[index++] = attribValue; \ |
| } |
| |
| static int createContext(_GLFWwindow* window, |
| const _GLFWwndconfig* wndconfig, |
| EGLint fbconfigID) |
| { |
| int attribs[40]; |
| EGLint count, index; |
| EGLConfig config; |
| EGLContext share = NULL; |
| |
| if (wndconfig->share) |
| share = wndconfig->share->EGL.context; |
| |
| // Retrieve the previously selected EGLConfig |
| { |
| index = 0; |
| |
| setEGLattrib(attribs, index, EGL_CONFIG_ID, fbconfigID); |
| setEGLattrib(attribs, index, EGL_NONE, EGL_NONE); |
| |
| eglChooseConfig(_glfwLibrary.EGL.display, attribs, &config, 1, &count); |
| if (!count) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "EGL: Failed to retrieve the selected EGLConfig"); |
| return GL_FALSE; |
| } |
| } |
| |
| // Retrieve the corresponding visual |
| // NOTE: This is the only non-portable code in this file. |
| // Maybe it would not hurt too much to add #ifdefs for different platforms? |
| #if defined(_GLFW_X11) |
| { |
| int mask; |
| EGLint redBits, greenBits, blueBits, alphaBits, visualID = 0; |
| XVisualInfo info; |
| |
| eglGetConfigAttrib(_glfwLibrary.EGL.display, config, |
| EGL_NATIVE_VISUAL_ID, &visualID); |
| |
| info.screen = _glfwLibrary.X11.screen; |
| mask = VisualScreenMask; |
| |
| if (visualID) |
| { |
| // The X window visual must match the EGL config |
| info.visualid = visualID; |
| mask |= VisualIDMask; |
| } |
| else |
| { |
| // some EGL drivers don't implement the EGL_NATIVE_VISUAL_ID |
| // attribute, so attempt to find the closest match. |
| |
| eglGetConfigAttrib(_glfwLibrary.EGL.display, config, |
| EGL_RED_SIZE, &redBits); |
| eglGetConfigAttrib(_glfwLibrary.EGL.display, config, |
| EGL_GREEN_SIZE, &greenBits); |
| eglGetConfigAttrib(_glfwLibrary.EGL.display, config, |
| EGL_BLUE_SIZE, &blueBits); |
| eglGetConfigAttrib(_glfwLibrary.EGL.display, config, |
| EGL_ALPHA_SIZE, &alphaBits); |
| |
| info.depth = redBits + greenBits + blueBits + alphaBits; |
| mask |= VisualDepthMask; |
| } |
| |
| window->EGL.visual = XGetVisualInfo(_glfwLibrary.X11.display, |
| mask, &info, &count); |
| |
| if (window->EGL.visual == NULL) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "EGL: Failed to retrieve visual for EGLConfig"); |
| return GL_FALSE; |
| } |
| } |
| #endif |
| |
| if (wndconfig->clientAPI == GLFW_OPENGL_ES_API) |
| { |
| if (!eglBindAPI(EGL_OPENGL_ES_API)) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "EGL: OpenGL ES is not supported"); |
| return GL_FALSE; |
| } |
| } |
| else |
| { |
| if (!eglBindAPI(EGL_OPENGL_API)) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "EGL: OpenGL is not supported"); |
| return GL_FALSE; |
| } |
| } |
| |
| index = 0; |
| |
| if (_glfwLibrary.EGL.KHR_create_context) |
| { |
| setEGLattrib(attribs, index, EGL_CONTEXT_MAJOR_VERSION_KHR, wndconfig->glMajor); |
| setEGLattrib(attribs, index, EGL_CONTEXT_MINOR_VERSION_KHR, wndconfig->glMinor); |
| |
| if (wndconfig->glForward || wndconfig->glDebug || wndconfig->glRobustness) |
| { |
| int flags = 0; |
| |
| if (wndconfig->glForward) |
| flags |= EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR; |
| |
| if (wndconfig->glDebug) |
| flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR; |
| |
| if (wndconfig->glRobustness) |
| flags |= EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR; |
| |
| setEGLattrib(attribs, index, EGL_CONTEXT_FLAGS_KHR, flags); |
| } |
| |
| if (wndconfig->glProfile) |
| { |
| int flags = 0; |
| |
| if (wndconfig->glProfile == GLFW_OPENGL_CORE_PROFILE) |
| flags = EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR; |
| else if (wndconfig->glProfile == GLFW_OPENGL_COMPAT_PROFILE) |
| flags = EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR; |
| |
| setEGLattrib(attribs, index, EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR, flags); |
| } |
| |
| if (wndconfig->glRobustness) |
| { |
| int strategy; |
| |
| if (wndconfig->glRobustness == GLFW_NO_RESET_NOTIFICATION) |
| strategy = EGL_NO_RESET_NOTIFICATION_KHR; |
| else if (wndconfig->glRobustness == GLFW_LOSE_CONTEXT_ON_RESET) |
| strategy = EGL_LOSE_CONTEXT_ON_RESET_KHR; |
| |
| setEGLattrib(attribs, index, EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_KHR, strategy); |
| } |
| } |
| else |
| { |
| if (wndconfig->clientAPI == GLFW_OPENGL_ES_API) |
| setEGLattrib(attribs, index, EGL_CONTEXT_CLIENT_VERSION, wndconfig->glMajor); |
| } |
| |
| setEGLattrib(attribs, index, EGL_NONE, EGL_NONE); |
| |
| window->EGL.context = eglCreateContext(_glfwLibrary.EGL.display, |
| config, share, attribs); |
| |
| if (window->EGL.context == EGL_NO_CONTEXT) |
| { |
| // TODO: Handle all the various error codes here |
| |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "EGL: Failed to create context"); |
| return GL_FALSE; |
| } |
| |
| window->EGL.config = config; |
| |
| return GL_TRUE; |
| } |
| |
| #undef setEGLattrib |
| |
| |
| ////////////////////////////////////////////////////////////////////////// |
| ////// GLFW internal API ////// |
| ////////////////////////////////////////////////////////////////////////// |
| |
| //======================================================================== |
| // Initialize EGL |
| //======================================================================== |
| |
| int _glfwInitOpenGL(void) |
| { |
| #ifdef _GLFW_DLOPEN_LIBEGL |
| int i; |
| char* libEGL_names[ ] = |
| { |
| "libEGL.so", |
| "libEGL.so.1", |
| "/usr/lib/libEGL.so", |
| "/usr/lib/libEGL.so.1", |
| NULL |
| }; |
| |
| for (i = 0; libEGL_names[i] != NULL; i++) |
| { |
| _glfwLibrary.EGL.libEGL = dlopen(libEGL_names[i], RTLD_LAZY | RTLD_GLOBAL); |
| if (_glfwLibrary.EGL.libEGL) |
| break; |
| } |
| |
| if (!_glfwLibrary.EGL.libEGL) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, "EGL: Failed to find libEGL"); |
| return GL_FALSE; |
| } |
| #endif |
| |
| _glfwLibrary.EGL.display = eglGetDisplay(_GLFW_EGL_NATIVE_DISPLAY); |
| if (_glfwLibrary.EGL.display == EGL_NO_DISPLAY) |
| { |
| _glfwSetError(GLFW_API_UNAVAILABLE, |
| "EGL: Failed to get EGL display"); |
| return GL_FALSE; |
| } |
| |
| if (!eglInitialize(_glfwLibrary.EGL.display, |
| &_glfwLibrary.EGL.majorVersion, |
| &_glfwLibrary.EGL.minorVersion)) |
| { |
| _glfwSetError(GLFW_API_UNAVAILABLE, |
| "EGL: Failed to initialize EGL"); |
| return GL_FALSE; |
| } |
| |
| if (_glfwPlatformExtensionSupported("EGL_KHR_create_context")) |
| _glfwLibrary.EGL.KHR_create_context = GL_TRUE; |
| |
| return GL_TRUE; |
| } |
| |
| |
| //======================================================================== |
| // Terminate EGL |
| //======================================================================== |
| |
| void _glfwTerminateOpenGL(void) |
| { |
| #ifdef _GLFW_DLOPEN_LIBEGL |
| if (_glfwLibrary.EGL.libEGL != NULL) |
| { |
| dlclose(_glfwLibrary.EGL.libEGL); |
| _glfwLibrary.EGL.libEGL = NULL; |
| } |
| #endif |
| |
| eglTerminate(_glfwLibrary.EGL.display); |
| } |
| |
| |
| //======================================================================== |
| // Prepare for creation of the OpenGL context |
| //======================================================================== |
| |
| int _glfwCreateContext(_GLFWwindow* window, |
| const _GLFWwndconfig* wndconfig, |
| const _GLFWfbconfig* fbconfig) |
| { |
| _GLFWfbconfig closest; |
| |
| // Choose the best available fbconfig |
| { |
| unsigned int fbcount; |
| _GLFWfbconfig* fbconfigs; |
| const _GLFWfbconfig* result; |
| |
| fbconfigs = getFBConfigs(window, wndconfig, &fbcount); |
| if (!fbconfigs) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "EGL: No usable EGLFBConfigs found"); |
| return GL_FALSE; |
| } |
| |
| result = _glfwChooseFBConfig(fbconfig, fbconfigs, fbcount); |
| if (!result) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "EGL: No EGLFBConfig matched the criteria"); |
| |
| free(fbconfigs); |
| return GL_FALSE; |
| } |
| |
| closest = *result; |
| free(fbconfigs); |
| } |
| |
| return createContext(window, wndconfig, closest.platformID); |
| } |
| |
| |
| //======================================================================== |
| // Destroy the OpenGL context |
| //======================================================================== |
| |
| void _glfwDestroyContext(_GLFWwindow* window) |
| { |
| if (window->EGL.visual) |
| { |
| XFree(window->EGL.visual); |
| window->EGL.visual = NULL; |
| } |
| |
| if (window->EGL.surface) |
| { |
| eglDestroySurface(_glfwLibrary.EGL.display, window->EGL.surface); |
| window->EGL.surface = EGL_NO_SURFACE; |
| } |
| |
| if (window->EGL.context) |
| { |
| eglDestroyContext(_glfwLibrary.EGL.display, window->EGL.context); |
| window->EGL.context = EGL_NO_CONTEXT; |
| } |
| } |
| |
| |
| //======================================================================== |
| // Make the OpenGL context associated with the specified window current |
| //======================================================================== |
| |
| void _glfwPlatformMakeContextCurrent(_GLFWwindow* window) |
| { |
| if (window) |
| { |
| if (window->EGL.surface == EGL_NO_SURFACE) |
| { |
| window->EGL.surface = eglCreateWindowSurface(_glfwLibrary.EGL.display, |
| window->EGL.config, |
| _GLFW_EGL_NATIVE_WINDOW, |
| NULL); |
| if (window->EGL.surface == EGL_NO_SURFACE) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "EGL: Failed to create window surface"); |
| } |
| } |
| |
| eglMakeCurrent(_glfwLibrary.EGL.display, |
| window->EGL.surface, |
| window->EGL.surface, |
| window->EGL.context); |
| } |
| else |
| { |
| eglMakeCurrent(_glfwLibrary.EGL.display, |
| EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT); |
| } |
| |
| _glfwCurrentWindow = window; |
| } |
| |
| |
| //======================================================================== |
| // Return the window object whose context is current |
| //======================================================================== |
| |
| _GLFWwindow* _glfwPlatformGetCurrentContext(void) |
| { |
| return _glfwCurrentWindow; |
| } |
| |
| |
| //======================================================================== |
| // Swap OpenGL buffers |
| //======================================================================== |
| |
| void _glfwPlatformSwapBuffers(_GLFWwindow* window) |
| { |
| eglSwapBuffers(_glfwLibrary.EGL.display, window->EGL.surface); |
| } |
| |
| |
| //======================================================================== |
| // Set double buffering swap interval |
| //======================================================================== |
| |
| void _glfwPlatformSwapInterval(int interval) |
| { |
| eglSwapInterval(_glfwLibrary.EGL.display, interval); |
| } |
| |
| |
| //======================================================================== |
| // Check if an OpenGL extension is available at runtime |
| //======================================================================== |
| |
| int _glfwPlatformExtensionSupported(const char* extension) |
| { |
| const char* extensions; |
| |
| extensions = eglQueryString(_glfwLibrary.EGL.display, EGL_EXTENSIONS); |
| if (extensions != NULL) |
| { |
| if (_glfwStringInExtensionString(extension, (unsigned char*) extensions)) |
| return GL_TRUE; |
| } |
| |
| return GL_FALSE; |
| } |
| |
| |
| //======================================================================== |
| // Get the function pointer to an OpenGL function |
| //======================================================================== |
| |
| GLFWglproc _glfwPlatformGetProcAddress(const char* procname) |
| { |
| return _glfw_eglGetProcAddress(procname); |
| } |
| |
