| //======================================================================== |
| // 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> |
| #include <assert.h> |
| |
| |
| // 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_framebuffer_sRGB = 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_framebuffer_sRGB")) |
| window->wgl.ARB_framebuffer_sRGB = 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 GLboolean choosePixelFormat(_GLFWwindow* window, |
| const _GLFWfbconfig* desired, |
| int* result) |
| { |
| _GLFWfbconfig* usableConfigs; |
| const _GLFWfbconfig* closest; |
| int i, nativeCount, usableCount; |
| |
| if (window->wgl.ARB_pixel_format) |
| { |
| nativeCount = getPixelFormatAttrib(window, |
| 1, |
| WGL_NUMBER_PIXEL_FORMATS_ARB); |
| } |
| else |
| { |
| nativeCount = DescribePixelFormat(window->wgl.dc, |
| 1, |
| sizeof(PIXELFORMATDESCRIPTOR), |
| NULL); |
| } |
| |
| if (!nativeCount) |
| { |
| _glfwInputError(GLFW_API_UNAVAILABLE, "WGL: No pixel formats found"); |
| return GL_FALSE; |
| } |
| |
| usableConfigs = (_GLFWfbconfig*) calloc(nativeCount, sizeof(_GLFWfbconfig)); |
| usableCount = 0; |
| |
| for (i = 0; i < nativeCount; i++) |
| { |
| const int n = i + 1; |
| _GLFWfbconfig* u = usableConfigs + usableCount; |
| |
| if (window->wgl.ARB_pixel_format) |
| { |
| // Get pixel format attributes through WGL_ARB_pixel_format |
| if (!getPixelFormatAttrib(window, n, WGL_SUPPORT_OPENGL_ARB) || |
| !getPixelFormatAttrib(window, n, WGL_DRAW_TO_WINDOW_ARB) || |
| !getPixelFormatAttrib(window, n, WGL_DOUBLE_BUFFER_ARB)) |
| { |
| continue; |
| } |
| |
| if (getPixelFormatAttrib(window, n, WGL_PIXEL_TYPE_ARB) != |
| WGL_TYPE_RGBA_ARB) |
| { |
| continue; |
| } |
| |
| if (getPixelFormatAttrib(window, n, WGL_ACCELERATION_ARB) == |
| WGL_NO_ACCELERATION_ARB) |
| { |
| continue; |
| } |
| |
| u->redBits = getPixelFormatAttrib(window, n, WGL_RED_BITS_ARB); |
| u->greenBits = getPixelFormatAttrib(window, n, WGL_GREEN_BITS_ARB); |
| u->blueBits = getPixelFormatAttrib(window, n, WGL_BLUE_BITS_ARB); |
| u->alphaBits = getPixelFormatAttrib(window, n, WGL_ALPHA_BITS_ARB); |
| |
| u->depthBits = getPixelFormatAttrib(window, n, WGL_DEPTH_BITS_ARB); |
| u->stencilBits = getPixelFormatAttrib(window, n, WGL_STENCIL_BITS_ARB); |
| |
| u->accumRedBits = getPixelFormatAttrib(window, n, WGL_ACCUM_RED_BITS_ARB); |
| u->accumGreenBits = getPixelFormatAttrib(window, n, WGL_ACCUM_GREEN_BITS_ARB); |
| u->accumBlueBits = getPixelFormatAttrib(window, n, WGL_ACCUM_BLUE_BITS_ARB); |
| u->accumAlphaBits = getPixelFormatAttrib(window, n, WGL_ACCUM_ALPHA_BITS_ARB); |
| |
| u->auxBuffers = getPixelFormatAttrib(window, n, WGL_AUX_BUFFERS_ARB); |
| u->stereo = getPixelFormatAttrib(window, n, WGL_STEREO_ARB); |
| |
| if (window->wgl.ARB_multisample) |
| u->samples = getPixelFormatAttrib(window, n, WGL_SAMPLES_ARB); |
| |
| if (window->wgl.ARB_framebuffer_sRGB) |
| u->sRGB = getPixelFormatAttrib(window, n, WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB); |
| } |
| else |
| { |
| PIXELFORMATDESCRIPTOR pfd; |
| |
| // Get pixel format attributes through old-fashioned PFDs |
| |
| if (!DescribePixelFormat(window->wgl.dc, |
| n, |
| 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; |
| |
| u->redBits = pfd.cRedBits; |
| u->greenBits = pfd.cGreenBits; |
| u->blueBits = pfd.cBlueBits; |
| u->alphaBits = pfd.cAlphaBits; |
| |
| u->depthBits = pfd.cDepthBits; |
| u->stencilBits = pfd.cStencilBits; |
| |
| u->accumRedBits = pfd.cAccumRedBits; |
| u->accumGreenBits = pfd.cAccumGreenBits; |
| u->accumBlueBits = pfd.cAccumBlueBits; |
| u->accumAlphaBits = pfd.cAccumAlphaBits; |
| |
| u->auxBuffers = pfd.cAuxBuffers; |
| u->stereo = (pfd.dwFlags & PFD_STEREO) ? GL_TRUE : GL_FALSE; |
| } |
| |
| u->wgl = n; |
| usableCount++; |
| } |
| |
| closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount); |
| if (!closest) |
| { |
| free(usableConfigs); |
| return GL_FALSE; |
| } |
| |
| *result = closest->wgl; |
| free(usableConfigs); |
| |
| return GL_TRUE; |
| } |
| |
| |
| ////////////////////////////////////////////////////////////////////////// |
| ////// GLFW internal API ////// |
| ////////////////////////////////////////////////////////////////////////// |
| |
| // Initialize WGL |
| // |
| int _glfwInitContextAPI(void) |
| { |
| _glfw.wgl.current = TlsAlloc(); |
| if (_glfw.wgl.current == TLS_OUT_OF_INDEXES) |
| { |
| _glfwInputError(GLFW_PLATFORM_ERROR, |
| "WGL: Failed to allocate TLS index"); |
| return GL_FALSE; |
| } |
| |
| _glfw.wgl.hasTLS = GL_TRUE; |
| |
| return GL_TRUE; |
| } |
| |
| // Terminate WGL |
| // |
| void _glfwTerminateContextAPI(void) |
| { |
| if (_glfw.wgl.hasTLS) |
| TlsFree(_glfw.wgl.current); |
| } |
| |
| #define setWGLattrib(attribName, attribValue) \ |
| { \ |
| attribs[index++] = attribName; \ |
| attribs[index++] = attribValue; \ |
| assert(index < sizeof(attribs) / sizeof(attribs[0])); \ |
| } |
| |
| // Prepare for creation of the OpenGL context |
| // |
| int _glfwCreateContext(_GLFWwindow* window, |
| const _GLFWwndconfig* wndconfig, |
| const _GLFWfbconfig* fbconfig) |
| { |
| int attribs[40]; |
| int pixelFormat = 0; |
| PIXELFORMATDESCRIPTOR pfd; |
| HGLRC share = NULL; |
| |
| if (wndconfig->share) |
| share = wndconfig->share->wgl.context; |
| |
| window->wgl.dc = GetDC(window->win32.handle); |
| if (!window->wgl.dc) |
| { |
| _glfwInputError(GLFW_PLATFORM_ERROR, |
| "Win32: Failed to retrieve DC for window"); |
| return GL_FALSE; |
| } |
| |
| if (!choosePixelFormat(window, fbconfig, &pixelFormat)) |
| { |
| _glfwInputError(GLFW_PLATFORM_ERROR, |
| "WGL: Failed to find a suitable pixel format"); |
| return GL_FALSE; |
| } |
| |
| if (!DescribePixelFormat(window->wgl.dc, pixelFormat, sizeof(pfd), &pfd)) |
| { |
| _glfwInputError(GLFW_PLATFORM_ERROR, |
| "Win32: Failed to retrieve PFD for selected pixel " |
| "format"); |
| return GL_FALSE; |
| } |
| |
| if (!SetPixelFormat(window->wgl.dc, pixelFormat, &pfd)) |
| { |
| _glfwInputError(GLFW_PLATFORM_ERROR, |
| "Win32: Failed to set selected pixel format"); |
| return GL_FALSE; |
| } |
| |
| if (window->wgl.ARB_create_context) |
| { |
| int index = 0, mask = 0, flags = 0, strategy = 0; |
| |
| if (wndconfig->clientAPI == GLFW_OPENGL_API) |
| { |
| if (wndconfig->glForward) |
| flags |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB; |
| |
| if (wndconfig->glDebug) |
| flags |= WGL_CONTEXT_DEBUG_BIT_ARB; |
| |
| if (wndconfig->glProfile) |
| { |
| if (wndconfig->glProfile == GLFW_OPENGL_CORE_PROFILE) |
| mask |= WGL_CONTEXT_CORE_PROFILE_BIT_ARB; |
| else if (wndconfig->glProfile == GLFW_OPENGL_COMPAT_PROFILE) |
| mask |= WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB; |
| } |
| } |
| else |
| mask |= WGL_CONTEXT_ES2_PROFILE_BIT_EXT; |
| |
| if (wndconfig->glRobustness) |
| { |
| if (window->wgl.ARB_create_context_robustness) |
| { |
| if (wndconfig->glRobustness == GLFW_NO_RESET_NOTIFICATION) |
| strategy = WGL_NO_RESET_NOTIFICATION_ARB; |
| else if (wndconfig->glRobustness == GLFW_LOSE_CONTEXT_ON_RESET) |
| strategy = WGL_LOSE_CONTEXT_ON_RESET_ARB; |
| |
| flags |= WGL_CONTEXT_ROBUST_ACCESS_BIT_ARB; |
| } |
| } |
| |
| if (wndconfig->glMajor != 1 || wndconfig->glMinor != 0) |
| { |
| setWGLattrib(WGL_CONTEXT_MAJOR_VERSION_ARB, wndconfig->glMajor); |
| setWGLattrib(WGL_CONTEXT_MINOR_VERSION_ARB, wndconfig->glMinor); |
| } |
| |
| if (flags) |
| setWGLattrib(WGL_CONTEXT_FLAGS_ARB, flags); |
| |
| if (mask) |
| setWGLattrib(WGL_CONTEXT_PROFILE_MASK_ARB, mask); |
| |
| if (strategy) |
| setWGLattrib(WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB, strategy); |
| |
| setWGLattrib(0, 0); |
| |
| window->wgl.context = window->wgl.CreateContextAttribsARB(window->wgl.dc, |
| share, |
| attribs); |
| if (!window->wgl.context) |
| { |
| _glfwInputError(GLFW_VERSION_UNAVAILABLE, |
| "WGL: Failed to create OpenGL context"); |
| return GL_FALSE; |
| } |
| } |
| else |
| { |
| window->wgl.context = wglCreateContext(window->wgl.dc); |
| if (!window->wgl.context) |
| { |
| _glfwInputError(GLFW_PLATFORM_ERROR, |
| "WGL: Failed to create OpenGL context"); |
| return GL_FALSE; |
| } |
| |
| if (share) |
| { |
| if (!wglShareLists(share, window->wgl.context)) |
| { |
| _glfwInputError(GLFW_PLATFORM_ERROR, |
| "WGL: Failed to enable sharing with specified " |
| "OpenGL context"); |
| return GL_FALSE; |
| } |
| } |
| } |
| |
| _glfwPlatformMakeContextCurrent(window); |
| initWGLExtensions(window); |
| |
| return GL_TRUE; |
| } |
| |
| #undef setWGLattrib |
| |
| // Destroy the OpenGL context |
| // |
| void _glfwDestroyContext(_GLFWwindow* window) |
| { |
| 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; |
| } |
| } |
| |
| // Analyzes the specified context for possible recreation |
| // |
| int _glfwAnalyzeContext(const _GLFWwindow* window, |
| const _GLFWwndconfig* wndconfig, |
| const _GLFWfbconfig* fbconfig) |
| { |
| GLboolean required = GL_FALSE; |
| |
| if (wndconfig->clientAPI == GLFW_OPENGL_API) |
| { |
| if (wndconfig->glForward) |
| { |
| if (!window->wgl.ARB_create_context) |
| { |
| _glfwInputError(GLFW_VERSION_UNAVAILABLE, |
| "WGL: A forward compatible OpenGL context " |
| "requested but WGL_ARB_create_context is " |
| "unavailable"); |
| return _GLFW_RECREATION_IMPOSSIBLE; |
| } |
| |
| required = GL_TRUE; |
| } |
| |
| if (wndconfig->glProfile) |
| { |
| if (!window->wgl.ARB_create_context_profile) |
| { |
| _glfwInputError(GLFW_VERSION_UNAVAILABLE, |
| "WGL: OpenGL profile requested but " |
| "WGL_ARB_create_context_profile is unavailable"); |
| return _GLFW_RECREATION_IMPOSSIBLE; |
| } |
| |
| required = GL_TRUE; |
| } |
| } |
| else |
| { |
| if (!window->wgl.ARB_create_context || |
| !window->wgl.ARB_create_context_profile || |
| !window->wgl.EXT_create_context_es2_profile) |
| { |
| _glfwInputError(GLFW_VERSION_UNAVAILABLE, |
| "WGL: OpenGL ES requested but " |
| "WGL_ARB_create_context_es2_profile is unavailable"); |
| return _GLFW_RECREATION_IMPOSSIBLE; |
| } |
| |
| required = GL_TRUE; |
| } |
| |
| if (wndconfig->glMajor != 1 || wndconfig->glMinor != 0) |
| { |
| if (window->wgl.ARB_create_context) |
| required = GL_TRUE; |
| } |
| |
| if (wndconfig->glDebug) |
| { |
| if (window->wgl.ARB_create_context) |
| required = GL_TRUE; |
| } |
| |
| if (fbconfig->samples > 0) |
| { |
| // We want FSAA, but can we get it? |
| // FSAA is not a hard constraint, so otherwise we just don't care |
| |
| if (window->wgl.ARB_multisample && window->wgl.ARB_pixel_format) |
| { |
| // We appear to have both the extension and the means to ask for it |
| required = GL_TRUE; |
| } |
| } |
| |
| if (required) |
| return _GLFW_RECREATION_REQUIRED; |
| |
| return _GLFW_RECREATION_NOT_NEEDED; |
| } |
| |
| |
| ////////////////////////////////////////////////////////////////////////// |
| ////// GLFW platform API ////// |
| ////////////////////////////////////////////////////////////////////////// |
| |
| void _glfwPlatformMakeContextCurrent(_GLFWwindow* window) |
| { |
| if (window) |
| wglMakeCurrent(window->wgl.dc, window->wgl.context); |
| else |
| wglMakeCurrent(NULL, NULL); |
| |
| TlsSetValue(_glfw.wgl.current, window); |
| } |
| |
| _GLFWwindow* _glfwPlatformGetCurrentContext(void) |
| { |
| return TlsGetValue(_glfw.wgl.current); |
| } |
| |
| void _glfwPlatformSwapBuffers(_GLFWwindow* window) |
| { |
| SwapBuffers(window->wgl.dc); |
| } |
| |
| void _glfwPlatformSwapInterval(int interval) |
| { |
| _GLFWwindow* window = _glfwPlatformGetCurrentContext(); |
| |
| if (_glfwIsCompositionEnabled()) |
| { |
| // Don't enabled vsync when desktop compositing is enabled, as it leads |
| // to frame jitter |
| return; |
| } |
| |
| if (window->wgl.EXT_swap_control) |
| window->wgl.SwapIntervalEXT(interval); |
| } |
| |
| int _glfwPlatformExtensionSupported(const char* extension) |
| { |
| const GLubyte* extensions; |
| |
| _GLFWwindow* window = _glfwPlatformGetCurrentContext(); |
| |
| 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; |
| } |
| |
| GLFWglproc _glfwPlatformGetProcAddress(const char* procname) |
| { |
| return (GLFWglproc) wglGetProcAddress(procname); |
| } |
| |
| |
| ////////////////////////////////////////////////////////////////////////// |
| ////// GLFW native API ////// |
| ////////////////////////////////////////////////////////////////////////// |
| |
| GLFWAPI HGLRC glfwGetWGLContext(GLFWwindow* handle) |
| { |
| _GLFWwindow* window = (_GLFWwindow*) handle; |
| _GLFW_REQUIRE_INIT_OR_RETURN(NULL); |
| return window->wgl.context; |
| } |
| |
