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654 lines
21 KiB
654 lines
21 KiB
//======================================================================== |
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// GLFW - An OpenGL library |
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// Platform: Win32/WGL |
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// API version: 3.0 |
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// WWW: http://www.glfw.org/ |
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//------------------------------------------------------------------------ |
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// Copyright (c) 2002-2006 Marcus Geelnard |
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// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org> |
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// |
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// This software is provided 'as-is', without any express or implied |
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// warranty. In no event will the authors be held liable for any damages |
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// arising from the use of this software. |
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// |
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// Permission is granted to anyone to use this software for any purpose, |
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// including commercial applications, and to alter it and redistribute it |
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// freely, subject to the following restrictions: |
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// |
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// 1. The origin of this software must not be misrepresented; you must not |
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// claim that you wrote the original software. If you use this software |
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// in a product, an acknowledgment in the product documentation would |
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// be appreciated but is not required. |
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// |
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// 2. Altered source versions must be plainly marked as such, and must not |
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// be misrepresented as being the original software. |
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// |
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// 3. This notice may not be removed or altered from any source |
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// distribution. |
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// |
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//======================================================================== |
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#include "internal.h" |
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|
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#include <stdlib.h> |
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#include <malloc.h> |
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//======================================================================== |
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// Thread local storage attribute macro |
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//======================================================================== |
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#if defined(_MSC_VER) |
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#define _GLFW_TLS __declspec(thread) |
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#elif defined(__GNUC__) |
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#define _GLFW_TLS __thread |
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#else |
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#define _GLFW_TLS |
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#endif |
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//======================================================================== |
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// The per-thread current context/window pointer |
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//======================================================================== |
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static _GLFW_TLS _GLFWwindow* _glfwCurrentWindow = NULL; |
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//======================================================================== |
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// Initialize WGL-specific extensions |
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// This function is called once before initial context creation, i.e. before |
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// any WGL extensions could be present. This is done in order to have both |
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// extension variable clearing and loading in the same place, hopefully |
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// decreasing the possibility of forgetting to add one without the other. |
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//======================================================================== |
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static void initWGLExtensions(_GLFWwindow* window) |
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{ |
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// This needs to include every function pointer loaded below |
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window->WGL.SwapIntervalEXT = NULL; |
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window->WGL.GetPixelFormatAttribivARB = NULL; |
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window->WGL.GetExtensionsStringARB = NULL; |
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window->WGL.GetExtensionsStringEXT = NULL; |
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window->WGL.CreateContextAttribsARB = NULL; |
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|
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// This needs to include every extension used below except for |
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// WGL_ARB_extensions_string and WGL_EXT_extensions_string |
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window->WGL.ARB_multisample = GL_FALSE; |
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window->WGL.ARB_create_context = GL_FALSE; |
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window->WGL.ARB_create_context_profile = GL_FALSE; |
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window->WGL.EXT_create_context_es2_profile = GL_FALSE; |
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window->WGL.ARB_create_context_robustness = GL_FALSE; |
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window->WGL.EXT_swap_control = GL_FALSE; |
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window->WGL.ARB_pixel_format = GL_FALSE; |
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window->WGL.GetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC) |
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wglGetProcAddress("wglGetExtensionsStringEXT"); |
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if (!window->WGL.GetExtensionsStringEXT) |
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{ |
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window->WGL.GetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC) |
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wglGetProcAddress("wglGetExtensionsStringARB"); |
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if (!window->WGL.GetExtensionsStringARB) |
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return; |
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} |
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if (_glfwPlatformExtensionSupported("WGL_ARB_multisample")) |
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window->WGL.ARB_multisample = GL_TRUE; |
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if (_glfwPlatformExtensionSupported("WGL_ARB_create_context")) |
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{ |
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window->WGL.CreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC) |
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wglGetProcAddress("wglCreateContextAttribsARB"); |
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if (window->WGL.CreateContextAttribsARB) |
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window->WGL.ARB_create_context = GL_TRUE; |
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} |
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if (window->WGL.ARB_create_context) |
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{ |
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if (_glfwPlatformExtensionSupported("WGL_ARB_create_context_profile")) |
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window->WGL.ARB_create_context_profile = GL_TRUE; |
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} |
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if (window->WGL.ARB_create_context && |
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window->WGL.ARB_create_context_profile) |
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{ |
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if (_glfwPlatformExtensionSupported("WGL_EXT_create_context_es2_profile")) |
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window->WGL.EXT_create_context_es2_profile = GL_TRUE; |
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} |
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if (window->WGL.ARB_create_context) |
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{ |
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if (_glfwPlatformExtensionSupported("WGL_ARB_create_context_robustness")) |
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window->WGL.ARB_create_context_robustness = GL_TRUE; |
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} |
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if (_glfwPlatformExtensionSupported("WGL_EXT_swap_control")) |
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{ |
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window->WGL.SwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC) |
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wglGetProcAddress("wglSwapIntervalEXT"); |
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if (window->WGL.SwapIntervalEXT) |
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window->WGL.EXT_swap_control = GL_TRUE; |
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} |
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if (_glfwPlatformExtensionSupported("WGL_ARB_pixel_format")) |
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{ |
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window->WGL.GetPixelFormatAttribivARB = (PFNWGLGETPIXELFORMATATTRIBIVARBPROC) |
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wglGetProcAddress("wglGetPixelFormatAttribivARB"); |
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if (window->WGL.GetPixelFormatAttribivARB) |
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window->WGL.ARB_pixel_format = GL_TRUE; |
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} |
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} |
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//======================================================================== |
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// Returns the specified attribute of the specified pixel format |
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// NOTE: Do not call this unless we have found WGL_ARB_pixel_format |
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//======================================================================== |
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static int getPixelFormatAttrib(_GLFWwindow* window, int pixelFormat, int attrib) |
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{ |
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int value = 0; |
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if (!window->WGL.GetPixelFormatAttribivARB(window->WGL.DC, |
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pixelFormat, |
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0, 1, &attrib, &value)) |
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{ |
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// NOTE: We should probably handle this error somehow |
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return 0; |
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} |
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return value; |
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} |
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//======================================================================== |
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// Return a list of available and usable framebuffer configs |
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//======================================================================== |
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static _GLFWfbconfig* getFBConfigs(_GLFWwindow* window, unsigned int* found) |
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{ |
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_GLFWfbconfig* fbconfigs; |
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PIXELFORMATDESCRIPTOR pfd; |
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int i, available; |
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*found = 0; |
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if (window->WGL.ARB_pixel_format) |
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{ |
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available = getPixelFormatAttrib(window, |
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1, |
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WGL_NUMBER_PIXEL_FORMATS_ARB); |
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} |
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else |
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{ |
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available = DescribePixelFormat(window->WGL.DC, |
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1, |
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sizeof(PIXELFORMATDESCRIPTOR), |
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NULL); |
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} |
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if (!available) |
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{ |
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_glfwSetError(GLFW_OPENGL_UNAVAILABLE, "WGL: No pixel formats found"); |
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return NULL; |
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} |
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fbconfigs = (_GLFWfbconfig*) malloc(sizeof(_GLFWfbconfig) * available); |
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if (!fbconfigs) |
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{ |
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_glfwSetError(GLFW_OUT_OF_MEMORY, NULL); |
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return NULL; |
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} |
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for (i = 1; i <= available; i++) |
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{ |
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_GLFWfbconfig* f = fbconfigs + *found; |
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if (window->WGL.ARB_pixel_format) |
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{ |
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// Get pixel format attributes through WGL_ARB_pixel_format |
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if (!getPixelFormatAttrib(window, i, WGL_SUPPORT_OPENGL_ARB) || |
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!getPixelFormatAttrib(window, i, WGL_DRAW_TO_WINDOW_ARB) || |
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!getPixelFormatAttrib(window, i, WGL_DOUBLE_BUFFER_ARB)) |
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{ |
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continue; |
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} |
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if (getPixelFormatAttrib(window, i, WGL_PIXEL_TYPE_ARB) != |
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WGL_TYPE_RGBA_ARB) |
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{ |
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continue; |
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} |
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if (getPixelFormatAttrib(window, i, WGL_ACCELERATION_ARB) == |
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WGL_NO_ACCELERATION_ARB) |
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{ |
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continue; |
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} |
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f->redBits = getPixelFormatAttrib(window, i, WGL_RED_BITS_ARB); |
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f->greenBits = getPixelFormatAttrib(window, i, WGL_GREEN_BITS_ARB); |
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f->blueBits = getPixelFormatAttrib(window, i, WGL_BLUE_BITS_ARB); |
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f->alphaBits = getPixelFormatAttrib(window, i, WGL_ALPHA_BITS_ARB); |
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f->depthBits = getPixelFormatAttrib(window, i, WGL_DEPTH_BITS_ARB); |
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f->stencilBits = getPixelFormatAttrib(window, i, WGL_STENCIL_BITS_ARB); |
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f->accumRedBits = getPixelFormatAttrib(window, i, WGL_ACCUM_RED_BITS_ARB); |
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f->accumGreenBits = getPixelFormatAttrib(window, i, WGL_ACCUM_GREEN_BITS_ARB); |
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f->accumBlueBits = getPixelFormatAttrib(window, i, WGL_ACCUM_BLUE_BITS_ARB); |
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f->accumAlphaBits = getPixelFormatAttrib(window, i, WGL_ACCUM_ALPHA_BITS_ARB); |
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f->auxBuffers = getPixelFormatAttrib(window, i, WGL_AUX_BUFFERS_ARB); |
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f->stereo = getPixelFormatAttrib(window, i, WGL_STEREO_ARB); |
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if (window->WGL.ARB_multisample) |
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f->samples = getPixelFormatAttrib(window, i, WGL_SAMPLES_ARB); |
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else |
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f->samples = 0; |
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} |
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else |
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{ |
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// Get pixel format attributes through old-fashioned PFDs |
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if (!DescribePixelFormat(window->WGL.DC, |
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i, |
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sizeof(PIXELFORMATDESCRIPTOR), |
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&pfd)) |
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{ |
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continue; |
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} |
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if (!(pfd.dwFlags & PFD_DRAW_TO_WINDOW) || |
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!(pfd.dwFlags & PFD_SUPPORT_OPENGL) || |
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!(pfd.dwFlags & PFD_DOUBLEBUFFER)) |
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{ |
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continue; |
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} |
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if (!(pfd.dwFlags & PFD_GENERIC_ACCELERATED) && |
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(pfd.dwFlags & PFD_GENERIC_FORMAT)) |
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{ |
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continue; |
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} |
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if (pfd.iPixelType != PFD_TYPE_RGBA) |
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continue; |
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f->redBits = pfd.cRedBits; |
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f->greenBits = pfd.cGreenBits; |
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f->blueBits = pfd.cBlueBits; |
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f->alphaBits = pfd.cAlphaBits; |
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f->depthBits = pfd.cDepthBits; |
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f->stencilBits = pfd.cStencilBits; |
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f->accumRedBits = pfd.cAccumRedBits; |
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f->accumGreenBits = pfd.cAccumGreenBits; |
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f->accumBlueBits = pfd.cAccumBlueBits; |
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f->accumAlphaBits = pfd.cAccumAlphaBits; |
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f->auxBuffers = pfd.cAuxBuffers; |
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f->stereo = (pfd.dwFlags & PFD_STEREO) ? GL_TRUE : GL_FALSE; |
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// PFD pixel formats do not support FSAA |
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f->samples = 0; |
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} |
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f->platformID = i; |
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(*found)++; |
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} |
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if (*found == 0) |
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{ |
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_glfwSetError(GLFW_PLATFORM_ERROR, |
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"Win32/WGL: No usable pixel formats found"); |
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free(fbconfigs); |
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return NULL; |
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} |
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return fbconfigs; |
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} |
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//======================================================================== |
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// Creates an OpenGL context on the specified device context |
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//======================================================================== |
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static GLboolean createContext(_GLFWwindow* window, |
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const _GLFWwndconfig* wndconfig, |
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int pixelFormat) |
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{ |
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PIXELFORMATDESCRIPTOR pfd; |
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int i = 0, attribs[40]; |
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HGLRC share = NULL; |
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if (wndconfig->share) |
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share = wndconfig->share->WGL.context; |
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if (!DescribePixelFormat(window->WGL.DC, pixelFormat, sizeof(pfd), &pfd)) |
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{ |
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_glfwSetError(GLFW_PLATFORM_ERROR, |
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"Win32: Failed to retrieve PFD for selected pixel format"); |
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return GL_FALSE; |
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} |
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if (!SetPixelFormat(window->WGL.DC, pixelFormat, &pfd)) |
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{ |
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_glfwSetError(GLFW_PLATFORM_ERROR, |
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"Win32: Failed to set selected pixel format"); |
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return GL_FALSE; |
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} |
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if (window->WGL.ARB_create_context) |
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{ |
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// Use the newer wglCreateContextAttribsARB creation method |
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if (wndconfig->glMajor != 1 || wndconfig->glMinor != 0) |
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{ |
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// Request an explicitly versioned context |
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attribs[i++] = WGL_CONTEXT_MAJOR_VERSION_ARB; |
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attribs[i++] = wndconfig->glMajor; |
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attribs[i++] = WGL_CONTEXT_MINOR_VERSION_ARB; |
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attribs[i++] = wndconfig->glMinor; |
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} |
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if (wndconfig->glForward || wndconfig->glDebug || wndconfig->glRobustness) |
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{ |
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int flags = 0; |
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if (wndconfig->glForward) |
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flags |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB; |
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if (wndconfig->glDebug) |
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flags |= WGL_CONTEXT_DEBUG_BIT_ARB; |
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if (wndconfig->glRobustness) |
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flags |= WGL_CONTEXT_ROBUST_ACCESS_BIT_ARB; |
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attribs[i++] = WGL_CONTEXT_FLAGS_ARB; |
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attribs[i++] = flags; |
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} |
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if (wndconfig->glProfile) |
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{ |
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int flags = 0; |
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if (!window->WGL.ARB_create_context_profile) |
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{ |
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_glfwSetError(GLFW_VERSION_UNAVAILABLE, |
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"WGL: OpenGL profile requested but " |
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"WGL_ARB_create_context_profile is unavailable"); |
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return GL_FALSE; |
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} |
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if (wndconfig->glProfile == GLFW_OPENGL_ES2_PROFILE && |
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!window->WGL.EXT_create_context_es2_profile) |
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{ |
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_glfwSetError(GLFW_VERSION_UNAVAILABLE, |
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"WGL: OpenGL ES 2.x profile requested but " |
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"WGL_EXT_create_context_es2_profile is unavailable"); |
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return GL_FALSE; |
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} |
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if (wndconfig->glProfile == GLFW_OPENGL_CORE_PROFILE) |
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flags = WGL_CONTEXT_CORE_PROFILE_BIT_ARB; |
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else if (wndconfig->glProfile == GLFW_OPENGL_COMPAT_PROFILE) |
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flags = WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB; |
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else if (wndconfig->glProfile == GLFW_OPENGL_ES2_PROFILE) |
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flags = WGL_CONTEXT_ES2_PROFILE_BIT_EXT; |
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attribs[i++] = WGL_CONTEXT_PROFILE_MASK_ARB; |
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attribs[i++] = flags; |
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} |
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if (wndconfig->glRobustness) |
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{ |
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int strategy; |
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if (!window->WGL.ARB_create_context_robustness) |
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{ |
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_glfwSetError(GLFW_VERSION_UNAVAILABLE, |
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"WGL: An OpenGL robustness strategy was " |
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"requested but WGL_ARB_create_context_robustness " |
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"is unavailable"); |
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return GL_FALSE; |
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} |
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if (wndconfig->glRobustness == GLFW_OPENGL_NO_RESET_NOTIFICATION) |
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strategy = WGL_NO_RESET_NOTIFICATION_ARB; |
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else if (wndconfig->glRobustness == GLFW_OPENGL_LOSE_CONTEXT_ON_RESET) |
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strategy = WGL_LOSE_CONTEXT_ON_RESET_ARB; |
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attribs[i++] = WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB; |
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attribs[i++] = strategy; |
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} |
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attribs[i++] = 0; |
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window->WGL.context = window->WGL.CreateContextAttribsARB(window->WGL.DC, |
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share, |
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attribs); |
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if (!window->WGL.context) |
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{ |
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_glfwSetError(GLFW_VERSION_UNAVAILABLE, |
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"WGL: Failed to create OpenGL context"); |
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return GL_FALSE; |
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} |
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} |
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else |
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{ |
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window->WGL.context = wglCreateContext(window->WGL.DC); |
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if (!window->WGL.context) |
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{ |
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_glfwSetError(GLFW_PLATFORM_ERROR, |
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"WGL: Failed to create OpenGL context"); |
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return GL_FALSE; |
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} |
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if (share) |
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{ |
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if (!wglShareLists(share, window->WGL.context)) |
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{ |
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_glfwSetError(GLFW_PLATFORM_ERROR, |
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"WGL: Failed to enable sharing with specified " |
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"OpenGL context"); |
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return GL_FALSE; |
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} |
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} |
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} |
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_glfwPlatformMakeContextCurrent(window); |
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initWGLExtensions(window); |
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return GL_TRUE; |
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} |
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////////////////////////////////////////////////////////////////////////// |
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////// GLFW internal API ////// |
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////////////////////////////////////////////////////////////////////////// |
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|
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//======================================================================== |
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// Prepare for creation of the OpenGL context |
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//======================================================================== |
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|
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int _glfwCreateContext(_GLFWwindow* window, |
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const _GLFWwndconfig* wndconfig, |
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const _GLFWfbconfig* fbconfig) |
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{ |
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_GLFWfbconfig closest; |
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window->WGL.DC = GetDC(window->Win32.handle); |
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if (!window->WGL.DC) |
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{ |
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_glfwSetError(GLFW_PLATFORM_ERROR, |
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"Win32: Failed to retrieve DC for window"); |
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return GL_FALSE; |
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} |
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// Choose the best available fbconfig |
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{ |
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unsigned int fbcount; |
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_GLFWfbconfig* fbconfigs; |
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const _GLFWfbconfig* result; |
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fbconfigs = getFBConfigs(window, &fbcount); |
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if (!fbconfigs) |
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return GL_FALSE; |
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result = _glfwChooseFBConfig(fbconfig, fbconfigs, fbcount); |
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if (!result) |
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{ |
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_glfwSetError(GLFW_FORMAT_UNAVAILABLE, |
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"Win32/WGL: No pixel format matched the criteria"); |
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|
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free(fbconfigs); |
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return GL_FALSE; |
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} |
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closest = *result; |
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free(fbconfigs); |
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} |
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return createContext(window, wndconfig, (int) closest.platformID); |
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} |
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|
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//======================================================================== |
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// Destroy the OpenGL context |
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//======================================================================== |
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|
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void _glfwDestroyContext(_GLFWwindow* window) |
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{ |
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// This is duplicated from glfwDestroyWindow |
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// TODO: Stop duplicating code |
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if (window == _glfwCurrentWindow) |
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_glfwPlatformMakeContextCurrent(NULL); |
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|
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if (window->WGL.context) |
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{ |
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wglDeleteContext(window->WGL.context); |
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window->WGL.context = NULL; |
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} |
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|
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if (window->WGL.DC) |
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{ |
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ReleaseDC(window->Win32.handle, window->WGL.DC); |
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window->WGL.DC = NULL; |
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} |
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} |
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|
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////////////////////////////////////////////////////////////////////////// |
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////// GLFW platform API ////// |
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////////////////////////////////////////////////////////////////////////// |
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|
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//======================================================================== |
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// Make the OpenGL context associated with the specified window current |
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//======================================================================== |
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|
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void _glfwPlatformMakeContextCurrent(_GLFWwindow* window) |
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{ |
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if (window) |
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wglMakeCurrent(window->WGL.DC, window->WGL.context); |
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else |
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wglMakeCurrent(NULL, NULL); |
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|
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_glfwCurrentWindow = window; |
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} |
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|
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|
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//======================================================================== |
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// Return the window object whose context is current |
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//======================================================================== |
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|
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_GLFWwindow* _glfwPlatformGetCurrentContext(void) |
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{ |
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return _glfwCurrentWindow; |
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} |
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|
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|
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//======================================================================== |
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// Swap buffers (double-buffering) |
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//======================================================================== |
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|
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void _glfwPlatformSwapBuffers(_GLFWwindow* window) |
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{ |
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SwapBuffers(window->WGL.DC); |
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} |
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|
|
|
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//======================================================================== |
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// Set double buffering swap interval |
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//======================================================================== |
|
|
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void _glfwPlatformSwapInterval(int interval) |
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{ |
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_GLFWwindow* window = _glfwCurrentWindow; |
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|
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if (window->WGL.EXT_swap_control) |
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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"); |
|
} |
|
} |
|
|
|
|