| //======================================================================== |
| // GLFW - An OpenGL library |
| // Platform: Win32/WGL |
| // 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 <stdlib.h> |
| #include <malloc.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; |
| |
| |
| //======================================================================== |
| // Initialize WGL-specific extensions |
| // This function is called once before initial context creation, i.e. before |
| // any WGL extensions could be present. This is done in order to have both |
| // extension variable clearing and loading in the same place, hopefully |
| // decreasing the possibility of forgetting to add one without the other. |
| //======================================================================== |
| |
| static void initWGLExtensions(_GLFWwindow* window) |
| { |
| // This needs to include every function pointer loaded below |
| window->WGL.SwapIntervalEXT = NULL; |
| window->WGL.GetPixelFormatAttribivARB = NULL; |
| window->WGL.GetExtensionsStringARB = NULL; |
| window->WGL.GetExtensionsStringEXT = NULL; |
| window->WGL.CreateContextAttribsARB = NULL; |
| |
| // This needs to include every extension used below except for |
| // WGL_ARB_extensions_string and WGL_EXT_extensions_string |
| window->WGL.ARB_multisample = GL_FALSE; |
| window->WGL.ARB_create_context = GL_FALSE; |
| window->WGL.ARB_create_context_profile = GL_FALSE; |
| window->WGL.EXT_create_context_es2_profile = GL_FALSE; |
| window->WGL.ARB_create_context_robustness = GL_FALSE; |
| window->WGL.EXT_swap_control = GL_FALSE; |
| window->WGL.ARB_pixel_format = GL_FALSE; |
| |
| window->WGL.GetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC) |
| wglGetProcAddress("wglGetExtensionsStringEXT"); |
| if (!window->WGL.GetExtensionsStringEXT) |
| { |
| window->WGL.GetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC) |
| wglGetProcAddress("wglGetExtensionsStringARB"); |
| if (!window->WGL.GetExtensionsStringARB) |
| return; |
| } |
| |
| if (_glfwPlatformExtensionSupported("WGL_ARB_multisample")) |
| window->WGL.ARB_multisample = GL_TRUE; |
| |
| if (_glfwPlatformExtensionSupported("WGL_ARB_create_context")) |
| { |
| window->WGL.CreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC) |
| wglGetProcAddress("wglCreateContextAttribsARB"); |
| |
| if (window->WGL.CreateContextAttribsARB) |
| window->WGL.ARB_create_context = GL_TRUE; |
| } |
| |
| if (window->WGL.ARB_create_context) |
| { |
| if (_glfwPlatformExtensionSupported("WGL_ARB_create_context_profile")) |
| window->WGL.ARB_create_context_profile = GL_TRUE; |
| } |
| |
| if (window->WGL.ARB_create_context && |
| window->WGL.ARB_create_context_profile) |
| { |
| if (_glfwPlatformExtensionSupported("WGL_EXT_create_context_es2_profile")) |
| window->WGL.EXT_create_context_es2_profile = GL_TRUE; |
| } |
| |
| if (window->WGL.ARB_create_context) |
| { |
| if (_glfwPlatformExtensionSupported("WGL_ARB_create_context_robustness")) |
| window->WGL.ARB_create_context_robustness = GL_TRUE; |
| } |
| |
| if (_glfwPlatformExtensionSupported("WGL_EXT_swap_control")) |
| { |
| window->WGL.SwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC) |
| wglGetProcAddress("wglSwapIntervalEXT"); |
| |
| if (window->WGL.SwapIntervalEXT) |
| window->WGL.EXT_swap_control = GL_TRUE; |
| } |
| |
| if (_glfwPlatformExtensionSupported("WGL_ARB_pixel_format")) |
| { |
| window->WGL.GetPixelFormatAttribivARB = (PFNWGLGETPIXELFORMATATTRIBIVARBPROC) |
| wglGetProcAddress("wglGetPixelFormatAttribivARB"); |
| |
| if (window->WGL.GetPixelFormatAttribivARB) |
| window->WGL.ARB_pixel_format = GL_TRUE; |
| } |
| } |
| |
| |
| //======================================================================== |
| // Returns the specified attribute of the specified pixel format |
| // NOTE: Do not call this unless we have found WGL_ARB_pixel_format |
| //======================================================================== |
| |
| static int getPixelFormatAttrib(_GLFWwindow* window, int pixelFormat, int attrib) |
| { |
| int value = 0; |
| |
| if (!window->WGL.GetPixelFormatAttribivARB(window->WGL.DC, |
| pixelFormat, |
| 0, 1, &attrib, &value)) |
| { |
| // NOTE: We should probably handle this error somehow |
| return 0; |
| } |
| |
| return value; |
| } |
| |
| |
| //======================================================================== |
| // Return a list of available and usable framebuffer configs |
| //======================================================================== |
| |
| static _GLFWfbconfig* getFBConfigs(_GLFWwindow* window, unsigned int* found) |
| { |
| _GLFWfbconfig* fbconfigs; |
| PIXELFORMATDESCRIPTOR pfd; |
| int i, available; |
| |
| *found = 0; |
| |
| if (window->WGL.ARB_pixel_format) |
| { |
| available = getPixelFormatAttrib(window, |
| 1, |
| WGL_NUMBER_PIXEL_FORMATS_ARB); |
| } |
| else |
| { |
| available = DescribePixelFormat(window->WGL.DC, |
| 1, |
| sizeof(PIXELFORMATDESCRIPTOR), |
| NULL); |
| } |
| |
| if (!available) |
| { |
| _glfwSetError(GLFW_OPENGL_UNAVAILABLE, "WGL: No pixel formats found"); |
| return NULL; |
| } |
| |
| fbconfigs = (_GLFWfbconfig*) malloc(sizeof(_GLFWfbconfig) * available); |
| if (!fbconfigs) |
| { |
| _glfwSetError(GLFW_OUT_OF_MEMORY, NULL); |
| return NULL; |
| } |
| |
| for (i = 1; i <= available; i++) |
| { |
| _GLFWfbconfig* f = fbconfigs + *found; |
| |
| if (window->WGL.ARB_pixel_format) |
| { |
| // Get pixel format attributes through WGL_ARB_pixel_format |
| if (!getPixelFormatAttrib(window, i, WGL_SUPPORT_OPENGL_ARB) || |
| !getPixelFormatAttrib(window, i, WGL_DRAW_TO_WINDOW_ARB) || |
| !getPixelFormatAttrib(window, i, WGL_DOUBLE_BUFFER_ARB)) |
| { |
| continue; |
| } |
| |
| if (getPixelFormatAttrib(window, i, WGL_PIXEL_TYPE_ARB) != |
| WGL_TYPE_RGBA_ARB) |
| { |
| continue; |
| } |
| |
| if (getPixelFormatAttrib(window, i, WGL_ACCELERATION_ARB) == |
| WGL_NO_ACCELERATION_ARB) |
| { |
| continue; |
| } |
| |
| f->redBits = getPixelFormatAttrib(window, i, WGL_RED_BITS_ARB); |
| f->greenBits = getPixelFormatAttrib(window, i, WGL_GREEN_BITS_ARB); |
| f->blueBits = getPixelFormatAttrib(window, i, WGL_BLUE_BITS_ARB); |
| f->alphaBits = getPixelFormatAttrib(window, i, WGL_ALPHA_BITS_ARB); |
| |
| f->depthBits = getPixelFormatAttrib(window, i, WGL_DEPTH_BITS_ARB); |
| f->stencilBits = getPixelFormatAttrib(window, i, WGL_STENCIL_BITS_ARB); |
| |
| f->accumRedBits = getPixelFormatAttrib(window, i, WGL_ACCUM_RED_BITS_ARB); |
| f->accumGreenBits = getPixelFormatAttrib(window, i, WGL_ACCUM_GREEN_BITS_ARB); |
| f->accumBlueBits = getPixelFormatAttrib(window, i, WGL_ACCUM_BLUE_BITS_ARB); |
| f->accumAlphaBits = getPixelFormatAttrib(window, i, WGL_ACCUM_ALPHA_BITS_ARB); |
| |
| f->auxBuffers = getPixelFormatAttrib(window, i, WGL_AUX_BUFFERS_ARB); |
| f->stereo = getPixelFormatAttrib(window, i, WGL_STEREO_ARB); |
| |
| if (window->WGL.ARB_multisample) |
| f->samples = getPixelFormatAttrib(window, i, WGL_SAMPLES_ARB); |
| else |
| f->samples = 0; |
| } |
| else |
| { |
| // Get pixel format attributes through old-fashioned PFDs |
| |
| if (!DescribePixelFormat(window->WGL.DC, |
| i, |
| sizeof(PIXELFORMATDESCRIPTOR), |
| &pfd)) |
| { |
| continue; |
| } |
| |
| if (!(pfd.dwFlags & PFD_DRAW_TO_WINDOW) || |
| !(pfd.dwFlags & PFD_SUPPORT_OPENGL) || |
| !(pfd.dwFlags & PFD_DOUBLEBUFFER)) |
| { |
| continue; |
| } |
| |
| if (!(pfd.dwFlags & PFD_GENERIC_ACCELERATED) && |
| (pfd.dwFlags & PFD_GENERIC_FORMAT)) |
| { |
| continue; |
| } |
| |
| if (pfd.iPixelType != PFD_TYPE_RGBA) |
| continue; |
| |
| f->redBits = pfd.cRedBits; |
| f->greenBits = pfd.cGreenBits; |
| f->blueBits = pfd.cBlueBits; |
| f->alphaBits = pfd.cAlphaBits; |
| |
| f->depthBits = pfd.cDepthBits; |
| f->stencilBits = pfd.cStencilBits; |
| |
| f->accumRedBits = pfd.cAccumRedBits; |
| f->accumGreenBits = pfd.cAccumGreenBits; |
| f->accumBlueBits = pfd.cAccumBlueBits; |
| f->accumAlphaBits = pfd.cAccumAlphaBits; |
| |
| f->auxBuffers = pfd.cAuxBuffers; |
| f->stereo = (pfd.dwFlags & PFD_STEREO) ? GL_TRUE : GL_FALSE; |
| |
| // PFD pixel formats do not support FSAA |
| f->samples = 0; |
| } |
| |
| f->platformID = i; |
| |
| (*found)++; |
| } |
| |
| if (*found == 0) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "Win32/WGL: No usable pixel formats found"); |
| |
| free(fbconfigs); |
| return NULL; |
| } |
| |
| return fbconfigs; |
| } |
| |
| |
| //======================================================================== |
| // Creates an OpenGL context on the specified device context |
| //======================================================================== |
| |
| static GLboolean createContext(_GLFWwindow* window, |
| const _GLFWwndconfig* wndconfig, |
| int pixelFormat) |
| { |
| PIXELFORMATDESCRIPTOR pfd; |
| int i = 0, attribs[40]; |
| HGLRC share = NULL; |
| |
| if (wndconfig->share) |
| share = wndconfig->share->WGL.context; |
| |
| if (!DescribePixelFormat(window->WGL.DC, pixelFormat, sizeof(pfd), &pfd)) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "Win32: Failed to retrieve PFD for selected pixel format"); |
| return GL_FALSE; |
| } |
| |
| if (!SetPixelFormat(window->WGL.DC, pixelFormat, &pfd)) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "Win32: Failed to set selected pixel format"); |
| return GL_FALSE; |
| } |
| |
| if (window->WGL.ARB_create_context) |
| { |
| // Use the newer wglCreateContextAttribsARB creation method |
| |
| if (wndconfig->glMajor != 1 || wndconfig->glMinor != 0) |
| { |
| // Request an explicitly versioned context |
| |
| attribs[i++] = WGL_CONTEXT_MAJOR_VERSION_ARB; |
| attribs[i++] = wndconfig->glMajor; |
| attribs[i++] = WGL_CONTEXT_MINOR_VERSION_ARB; |
| attribs[i++] = wndconfig->glMinor; |
| } |
| |
| if (wndconfig->glForward || wndconfig->glDebug || wndconfig->glRobustness) |
| { |
| int flags = 0; |
| |
| if (wndconfig->glForward) |
| flags |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB; |
| |
| if (wndconfig->glDebug) |
| flags |= WGL_CONTEXT_DEBUG_BIT_ARB; |
| |
| if (wndconfig->glRobustness) |
| flags |= WGL_CONTEXT_ROBUST_ACCESS_BIT_ARB; |
| |
| attribs[i++] = WGL_CONTEXT_FLAGS_ARB; |
| attribs[i++] = flags; |
| } |
| |
| if (wndconfig->glProfile) |
| { |
| int flags = 0; |
| |
| if (!window->WGL.ARB_create_context_profile) |
| { |
| _glfwSetError(GLFW_VERSION_UNAVAILABLE, |
| "WGL: OpenGL profile requested but " |
| "WGL_ARB_create_context_profile is unavailable"); |
| return GL_FALSE; |
| } |
| |
| if (wndconfig->glProfile == GLFW_OPENGL_ES2_PROFILE && |
| !window->WGL.EXT_create_context_es2_profile) |
| { |
| _glfwSetError(GLFW_VERSION_UNAVAILABLE, |
| "WGL: OpenGL ES 2.x profile requested but " |
| "WGL_EXT_create_context_es2_profile is unavailable"); |
| return GL_FALSE; |
| } |
| |
| if (wndconfig->glProfile == GLFW_OPENGL_CORE_PROFILE) |
| flags = WGL_CONTEXT_CORE_PROFILE_BIT_ARB; |
| else if (wndconfig->glProfile == GLFW_OPENGL_COMPAT_PROFILE) |
| flags = WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB; |
| else if (wndconfig->glProfile == GLFW_OPENGL_ES2_PROFILE) |
| flags = WGL_CONTEXT_ES2_PROFILE_BIT_EXT; |
| |
| attribs[i++] = WGL_CONTEXT_PROFILE_MASK_ARB; |
| attribs[i++] = flags; |
| } |
| |
| if (wndconfig->glRobustness) |
| { |
| int strategy; |
| |
| if (!window->WGL.ARB_create_context_robustness) |
| { |
| _glfwSetError(GLFW_VERSION_UNAVAILABLE, |
| "WGL: An OpenGL robustness strategy was " |
| "requested but WGL_ARB_create_context_robustness " |
| "is unavailable"); |
| return GL_FALSE; |
| } |
| |
| if (wndconfig->glRobustness == GLFW_OPENGL_NO_RESET_NOTIFICATION) |
| strategy = WGL_NO_RESET_NOTIFICATION_ARB; |
| else if (wndconfig->glRobustness == GLFW_OPENGL_LOSE_CONTEXT_ON_RESET) |
| strategy = WGL_LOSE_CONTEXT_ON_RESET_ARB; |
| |
| attribs[i++] = WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB; |
| attribs[i++] = strategy; |
| } |
| |
| attribs[i++] = 0; |
| |
| window->WGL.context = window->WGL.CreateContextAttribsARB(window->WGL.DC, |
| share, |
| attribs); |
| if (!window->WGL.context) |
| { |
| _glfwSetError(GLFW_VERSION_UNAVAILABLE, |
| "WGL: Failed to create OpenGL context"); |
| return GL_FALSE; |
| } |
| } |
| else |
| { |
| window->WGL.context = wglCreateContext(window->WGL.DC); |
| if (!window->WGL.context) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "WGL: Failed to create OpenGL context"); |
| return GL_FALSE; |
| } |
| |
| if (share) |
| { |
| if (!wglShareLists(share, window->WGL.context)) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "WGL: Failed to enable sharing with specified " |
| "OpenGL context"); |
| return GL_FALSE; |
| } |
| } |
| } |
| |
| _glfwPlatformMakeContextCurrent(window); |
| initWGLExtensions(window); |
| |
| return GL_TRUE; |
| } |
| |
| |
| ////////////////////////////////////////////////////////////////////////// |
| ////// GLFW internal API ////// |
| ////////////////////////////////////////////////////////////////////////// |
| |
| //======================================================================== |
| // Prepare for creation of the OpenGL context |
| //======================================================================== |
| |
| int _glfwCreateContext(_GLFWwindow* window, |
| const _GLFWwndconfig* wndconfig, |
| const _GLFWfbconfig* fbconfig) |
| { |
| _GLFWfbconfig closest; |
| |
| window->WGL.DC = GetDC(window->Win32.handle); |
| if (!window->WGL.DC) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "Win32: Failed to retrieve DC for window"); |
| return GL_FALSE; |
| } |
| |
| // Choose the best available fbconfig |
| { |
| unsigned int fbcount; |
| _GLFWfbconfig* fbconfigs; |
| const _GLFWfbconfig* result; |
| |
| fbconfigs = getFBConfigs(window, &fbcount); |
| if (!fbconfigs) |
| return GL_FALSE; |
| |
| result = _glfwChooseFBConfig(fbconfig, fbconfigs, fbcount); |
| if (!result) |
| { |
| _glfwSetError(GLFW_FORMAT_UNAVAILABLE, |
| "Win32/WGL: No pixel format matched the criteria"); |
| |
| free(fbconfigs); |
| return GL_FALSE; |
| } |
| |
| closest = *result; |
| free(fbconfigs); |
| } |
| |
| return createContext(window, wndconfig, (int) closest.platformID); |
| } |
| |
| |
| //======================================================================== |
| // Destroy the OpenGL context |
| //======================================================================== |
| |
| void _glfwDestroyContext(_GLFWwindow* window) |
| { |
| // This is duplicated from glfwDestroyWindow |
| // TODO: Stop duplicating code |
| if (window == _glfwCurrentWindow) |
| _glfwPlatformMakeContextCurrent(NULL); |
| |
| if (window->WGL.context) |
| { |
| wglDeleteContext(window->WGL.context); |
| window->WGL.context = NULL; |
| } |
| |
| if (window->WGL.DC) |
| { |
| ReleaseDC(window->Win32.handle, window->WGL.DC); |
| window->WGL.DC = NULL; |
| } |
| } |
| |
| |
| ////////////////////////////////////////////////////////////////////////// |
| ////// GLFW platform API ////// |
| ////////////////////////////////////////////////////////////////////////// |
| |
| //======================================================================== |
| // Make the OpenGL context associated with the specified window current |
| //======================================================================== |
| |
| void _glfwPlatformMakeContextCurrent(_GLFWwindow* window) |
| { |
| if (window) |
| wglMakeCurrent(window->WGL.DC, window->WGL.context); |
| else |
| wglMakeCurrent(NULL, NULL); |
| |
| _glfwCurrentWindow = window; |
| } |
| |
| |
| //======================================================================== |
| // Return the window object whose context is current |
| //======================================================================== |
| |
| _GLFWwindow* _glfwPlatformGetCurrentContext(void) |
| { |
| return _glfwCurrentWindow; |
| } |
| |
| |
| //======================================================================== |
| // Swap buffers (double-buffering) |
| //======================================================================== |
| |
| void _glfwPlatformSwapBuffers(_GLFWwindow* window) |
| { |
| SwapBuffers(window->WGL.DC); |
| } |
| |
| |
| //======================================================================== |
| // Set double buffering swap interval |
| //======================================================================== |
| |
| void _glfwPlatformSwapInterval(int interval) |
| { |
| _GLFWwindow* window = _glfwCurrentWindow; |
| |
| if (window->WGL.EXT_swap_control) |
| window->WGL.SwapIntervalEXT(interval); |
| } |
| |
| |
| //======================================================================== |
| // Check if the current context supports the specified WGL extension |
| //======================================================================== |
| |
| int _glfwPlatformExtensionSupported(const char* extension) |
| { |
| const GLubyte* extensions; |
| |
| _GLFWwindow* window = _glfwCurrentWindow; |
| |
| if (window->WGL.GetExtensionsStringEXT != NULL) |
| { |
| extensions = (GLubyte*) window->WGL.GetExtensionsStringEXT(); |
| if (extensions != NULL) |
| { |
| if (_glfwStringInExtensionString(extension, extensions)) |
| return GL_TRUE; |
| } |
| } |
| |
| if (window->WGL.GetExtensionsStringARB != NULL) |
| { |
| extensions = (GLubyte*) window->WGL.GetExtensionsStringARB(window->WGL.DC); |
| if (extensions != NULL) |
| { |
| if (_glfwStringInExtensionString(extension, extensions)) |
| return GL_TRUE; |
| } |
| } |
| |
| return GL_FALSE; |
| } |
| |
| |
| //======================================================================== |
| // Get the function pointer to an OpenGL function |
| //======================================================================== |
| |
| GLFWglproc _glfwPlatformGetProcAddress(const char* procname) |
| { |
| return (GLFWglproc) wglGetProcAddress(procname); |
| } |
| |
| |
| //======================================================================== |
| // Copies the specified OpenGL state categories from src to dst |
| //======================================================================== |
| |
| void _glfwPlatformCopyContext(_GLFWwindow* src, _GLFWwindow* dst, unsigned long mask) |
| { |
| if (!wglCopyContext(src->WGL.context, dst->WGL.context, mask)) |
| { |
| _glfwSetError(GLFW_PLATFORM_ERROR, |
| "WGL: Failed to copy OpenGL context attributes"); |
| } |
| } |
| |
