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679 lines
21 KiB
679 lines
21 KiB
//======================================================================== |
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// GLFW 3.2 WGL - 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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#include <stdlib.h> |
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#include <malloc.h> |
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#include <assert.h> |
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// Initialize WGL-specific extensions |
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// |
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static void loadExtensions(void) |
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{ |
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// Functions for WGL_EXT_extension_string |
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// NOTE: These are needed by _glfwPlatformExtensionSupported |
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_glfw.wgl.GetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC) |
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_glfw_wglGetProcAddress("wglGetExtensionsStringEXT"); |
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_glfw.wgl.GetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC) |
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_glfw_wglGetProcAddress("wglGetExtensionsStringARB"); |
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// Functions for WGL_ARB_create_context |
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_glfw.wgl.CreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC) |
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_glfw_wglGetProcAddress("wglCreateContextAttribsARB"); |
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// Functions for WGL_EXT_swap_control |
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_glfw.wgl.SwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC) |
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_glfw_wglGetProcAddress("wglSwapIntervalEXT"); |
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// Functions for WGL_ARB_pixel_format |
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_glfw.wgl.GetPixelFormatAttribivARB = (PFNWGLGETPIXELFORMATATTRIBIVARBPROC) |
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_glfw_wglGetProcAddress("wglGetPixelFormatAttribivARB"); |
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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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_glfw.wgl.ARB_multisample = |
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_glfwPlatformExtensionSupported("WGL_ARB_multisample"); |
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_glfw.wgl.ARB_framebuffer_sRGB = |
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_glfwPlatformExtensionSupported("WGL_ARB_framebuffer_sRGB"); |
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_glfw.wgl.EXT_framebuffer_sRGB = |
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_glfwPlatformExtensionSupported("WGL_EXT_framebuffer_sRGB"); |
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_glfw.wgl.ARB_create_context = |
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_glfwPlatformExtensionSupported("WGL_ARB_create_context"); |
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_glfw.wgl.ARB_create_context_profile = |
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_glfwPlatformExtensionSupported("WGL_ARB_create_context_profile"); |
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_glfw.wgl.EXT_create_context_es2_profile = |
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_glfwPlatformExtensionSupported("WGL_EXT_create_context_es2_profile"); |
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_glfw.wgl.ARB_create_context_robustness = |
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_glfwPlatformExtensionSupported("WGL_ARB_create_context_robustness"); |
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_glfw.wgl.EXT_swap_control = |
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_glfwPlatformExtensionSupported("WGL_EXT_swap_control"); |
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_glfw.wgl.ARB_pixel_format = |
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_glfwPlatformExtensionSupported("WGL_ARB_pixel_format"); |
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_glfw.wgl.ARB_context_flush_control = |
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_glfwPlatformExtensionSupported("WGL_ARB_context_flush_control"); |
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_glfw.wgl.extensionsLoaded = GLFW_TRUE; |
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} |
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// Returns the specified attribute of the specified 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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assert(_glfw.wgl.ARB_pixel_format); |
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if (!_glfw.wgl.GetPixelFormatAttribivARB(window->context.wgl.dc, |
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pixelFormat, |
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0, 1, &attrib, &value)) |
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{ |
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_glfwInputError(GLFW_PLATFORM_ERROR, |
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"WGL: Failed to retrieve pixel format attribute %i", |
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attrib); |
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return 0; |
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} |
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return value; |
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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 GLFWbool choosePixelFormat(_GLFWwindow* window, |
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const _GLFWfbconfig* desired, |
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int* result) |
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{ |
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_GLFWfbconfig* usableConfigs; |
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const _GLFWfbconfig* closest; |
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int i, nativeCount, usableCount; |
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if (_glfw.wgl.ARB_pixel_format) |
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{ |
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nativeCount = 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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nativeCount = DescribePixelFormat(window->context.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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usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig)); |
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usableCount = 0; |
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for (i = 0; i < nativeCount; i++) |
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{ |
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const int n = i + 1; |
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_GLFWfbconfig* u = usableConfigs + usableCount; |
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if (_glfw.wgl.ARB_pixel_format) |
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{ |
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// Get pixel format attributes through "modern" extension |
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if (!getPixelFormatAttrib(window, n, WGL_SUPPORT_OPENGL_ARB) || |
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!getPixelFormatAttrib(window, n, WGL_DRAW_TO_WINDOW_ARB)) |
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{ |
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continue; |
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} |
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if (getPixelFormatAttrib(window, n, 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, n, 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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u->redBits = getPixelFormatAttrib(window, n, WGL_RED_BITS_ARB); |
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u->greenBits = getPixelFormatAttrib(window, n, WGL_GREEN_BITS_ARB); |
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u->blueBits = getPixelFormatAttrib(window, n, WGL_BLUE_BITS_ARB); |
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u->alphaBits = getPixelFormatAttrib(window, n, WGL_ALPHA_BITS_ARB); |
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u->depthBits = getPixelFormatAttrib(window, n, WGL_DEPTH_BITS_ARB); |
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u->stencilBits = getPixelFormatAttrib(window, n, WGL_STENCIL_BITS_ARB); |
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u->accumRedBits = getPixelFormatAttrib(window, n, WGL_ACCUM_RED_BITS_ARB); |
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u->accumGreenBits = getPixelFormatAttrib(window, n, WGL_ACCUM_GREEN_BITS_ARB); |
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u->accumBlueBits = getPixelFormatAttrib(window, n, WGL_ACCUM_BLUE_BITS_ARB); |
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u->accumAlphaBits = getPixelFormatAttrib(window, n, WGL_ACCUM_ALPHA_BITS_ARB); |
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u->auxBuffers = getPixelFormatAttrib(window, n, WGL_AUX_BUFFERS_ARB); |
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if (getPixelFormatAttrib(window, n, WGL_STEREO_ARB)) |
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u->stereo = GLFW_TRUE; |
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if (getPixelFormatAttrib(window, n, WGL_DOUBLE_BUFFER_ARB)) |
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u->doublebuffer = GLFW_TRUE; |
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if (_glfw.wgl.ARB_multisample) |
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u->samples = getPixelFormatAttrib(window, n, WGL_SAMPLES_ARB); |
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if (_glfw.wgl.ARB_framebuffer_sRGB || |
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_glfw.wgl.EXT_framebuffer_sRGB) |
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{ |
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if (getPixelFormatAttrib(window, n, WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB)) |
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u->sRGB = GLFW_TRUE; |
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} |
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} |
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else |
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{ |
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PIXELFORMATDESCRIPTOR pfd; |
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// Get pixel format attributes through legacy PFDs |
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if (!DescribePixelFormat(window->context.wgl.dc, |
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n, |
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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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{ |
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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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u->redBits = pfd.cRedBits; |
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u->greenBits = pfd.cGreenBits; |
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u->blueBits = pfd.cBlueBits; |
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u->alphaBits = pfd.cAlphaBits; |
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u->depthBits = pfd.cDepthBits; |
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u->stencilBits = pfd.cStencilBits; |
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u->accumRedBits = pfd.cAccumRedBits; |
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u->accumGreenBits = pfd.cAccumGreenBits; |
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u->accumBlueBits = pfd.cAccumBlueBits; |
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u->accumAlphaBits = pfd.cAccumAlphaBits; |
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u->auxBuffers = pfd.cAuxBuffers; |
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if (pfd.dwFlags & PFD_STEREO) |
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u->stereo = GLFW_TRUE; |
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if (pfd.dwFlags & PFD_DOUBLEBUFFER) |
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u->doublebuffer = GLFW_TRUE; |
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} |
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u->wgl = n; |
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usableCount++; |
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} |
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if (!usableCount) |
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{ |
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_glfwInputError(GLFW_API_UNAVAILABLE, |
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"WGL: The driver does not appear to support OpenGL"); |
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free(usableConfigs); |
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return GLFW_FALSE; |
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} |
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closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount); |
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if (!closest) |
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{ |
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_glfwInputError(GLFW_FORMAT_UNAVAILABLE, |
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"WGL: Failed to find a suitable pixel format"); |
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free(usableConfigs); |
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return GLFW_FALSE; |
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} |
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*result = closest->wgl; |
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free(usableConfigs); |
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return GLFW_TRUE; |
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} |
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////////////////////////////////////////////////////////////////////////// |
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////// GLFW internal API ////// |
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////////////////////////////////////////////////////////////////////////// |
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// Initialize WGL |
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// |
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int _glfwInitContextAPI(void) |
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{ |
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if (!_glfwCreateContextTLS()) |
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return GLFW_FALSE; |
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_glfw.wgl.instance = LoadLibraryA("opengl32.dll"); |
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if (!_glfw.wgl.instance) |
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{ |
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_glfwInputError(GLFW_PLATFORM_ERROR, "WGL: Failed to load opengl32.dll"); |
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return GLFW_FALSE; |
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} |
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_glfw.wgl.CreateContext = (WGLCREATECONTEXT_T) |
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GetProcAddress(_glfw.wgl.instance, "wglCreateContext"); |
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_glfw.wgl.DeleteContext = (WGLDELETECONTEXT_T) |
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GetProcAddress(_glfw.wgl.instance, "wglDeleteContext"); |
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_glfw.wgl.GetProcAddress = (WGLGETPROCADDRESS_T) |
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GetProcAddress(_glfw.wgl.instance, "wglGetProcAddress"); |
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_glfw.wgl.MakeCurrent = (WGLMAKECURRENT_T) |
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GetProcAddress(_glfw.wgl.instance, "wglMakeCurrent"); |
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_glfw.wgl.ShareLists = (WGLSHARELISTS_T) |
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GetProcAddress(_glfw.wgl.instance, "wglShareLists"); |
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return GLFW_TRUE; |
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} |
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// Terminate WGL |
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// |
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void _glfwTerminateContextAPI(void) |
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{ |
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if (_glfw.wgl.instance) |
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FreeLibrary(_glfw.wgl.instance); |
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_glfwDestroyContextTLS(); |
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} |
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#define setWGLattrib(attribName, attribValue) \ |
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{ \ |
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attribs[index++] = attribName; \ |
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attribs[index++] = attribValue; \ |
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assert((size_t) index < sizeof(attribs) / sizeof(attribs[0])); \ |
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} |
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// Create the OpenGL or OpenGL ES context |
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// |
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int _glfwCreateContext(_GLFWwindow* window, |
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const _GLFWctxconfig* ctxconfig, |
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const _GLFWfbconfig* fbconfig) |
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{ |
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int attribs[40]; |
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int pixelFormat = 0; |
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PIXELFORMATDESCRIPTOR pfd; |
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HGLRC share = NULL; |
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if (ctxconfig->share) |
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share = ctxconfig->share->context.wgl.handle; |
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window->context.wgl.dc = GetDC(window->win32.handle); |
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if (!window->context.wgl.dc) |
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{ |
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_glfwInputError(GLFW_PLATFORM_ERROR, |
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"WGL: Failed to retrieve DC for window"); |
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return GLFW_FALSE; |
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} |
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if (!choosePixelFormat(window, fbconfig, &pixelFormat)) |
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return GLFW_FALSE; |
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if (!DescribePixelFormat(window->context.wgl.dc, |
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pixelFormat, sizeof(pfd), &pfd)) |
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{ |
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_glfwInputError(GLFW_PLATFORM_ERROR, |
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"WGL: Failed to retrieve PFD for selected pixel format"); |
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return GLFW_FALSE; |
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} |
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if (!SetPixelFormat(window->context.wgl.dc, pixelFormat, &pfd)) |
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{ |
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_glfwInputError(GLFW_PLATFORM_ERROR, |
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"WGL: Failed to set selected pixel format"); |
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return GLFW_FALSE; |
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} |
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if (_glfw.wgl.ARB_create_context) |
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{ |
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int index = 0, mask = 0, flags = 0; |
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if (ctxconfig->api == GLFW_OPENGL_API) |
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{ |
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if (ctxconfig->forward) |
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flags |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB; |
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if (ctxconfig->profile == GLFW_OPENGL_CORE_PROFILE) |
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mask |= WGL_CONTEXT_CORE_PROFILE_BIT_ARB; |
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else if (ctxconfig->profile == GLFW_OPENGL_COMPAT_PROFILE) |
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mask |= WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB; |
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} |
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else |
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mask |= WGL_CONTEXT_ES2_PROFILE_BIT_EXT; |
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if (ctxconfig->debug) |
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flags |= WGL_CONTEXT_DEBUG_BIT_ARB; |
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if (ctxconfig->noerror) |
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flags |= GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR; |
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if (ctxconfig->robustness) |
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{ |
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if (_glfw.wgl.ARB_create_context_robustness) |
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{ |
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if (ctxconfig->robustness == GLFW_NO_RESET_NOTIFICATION) |
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{ |
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setWGLattrib(WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB, |
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WGL_NO_RESET_NOTIFICATION_ARB); |
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} |
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else if (ctxconfig->robustness == GLFW_LOSE_CONTEXT_ON_RESET) |
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{ |
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setWGLattrib(WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB, |
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WGL_LOSE_CONTEXT_ON_RESET_ARB); |
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} |
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flags |= WGL_CONTEXT_ROBUST_ACCESS_BIT_ARB; |
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} |
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} |
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if (ctxconfig->release) |
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{ |
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if (_glfw.wgl.ARB_context_flush_control) |
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{ |
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if (ctxconfig->release == GLFW_RELEASE_BEHAVIOR_NONE) |
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{ |
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setWGLattrib(WGL_CONTEXT_RELEASE_BEHAVIOR_ARB, |
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WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB); |
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} |
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else if (ctxconfig->release == GLFW_RELEASE_BEHAVIOR_FLUSH) |
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{ |
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setWGLattrib(WGL_CONTEXT_RELEASE_BEHAVIOR_ARB, |
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WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB); |
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} |
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} |
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} |
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// NOTE: Only request an explicitly versioned context when necessary, as |
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// explicitly requesting version 1.0 does not always return the |
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// highest version supported by the driver |
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if (ctxconfig->major != 1 || ctxconfig->minor != 0) |
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{ |
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setWGLattrib(WGL_CONTEXT_MAJOR_VERSION_ARB, ctxconfig->major); |
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setWGLattrib(WGL_CONTEXT_MINOR_VERSION_ARB, ctxconfig->minor); |
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} |
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if (flags) |
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setWGLattrib(WGL_CONTEXT_FLAGS_ARB, flags); |
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if (mask) |
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setWGLattrib(WGL_CONTEXT_PROFILE_MASK_ARB, mask); |
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setWGLattrib(0, 0); |
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window->context.wgl.handle = |
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_glfw.wgl.CreateContextAttribsARB(window->context.wgl.dc, |
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share, attribs); |
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if (!window->context.wgl.handle) |
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{ |
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_glfwInputError(GLFW_VERSION_UNAVAILABLE, |
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"WGL: Failed to create OpenGL context"); |
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return GLFW_FALSE; |
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} |
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} |
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else |
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{ |
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window->context.wgl.handle = |
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_glfw_wglCreateContext(window->context.wgl.dc); |
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if (!window->context.wgl.handle) |
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{ |
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_glfwInputError(GLFW_VERSION_UNAVAILABLE, |
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"WGL: Failed to create OpenGL context"); |
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return GLFW_FALSE; |
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} |
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if (share) |
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{ |
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if (!_glfw_wglShareLists(share, window->context.wgl.handle)) |
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{ |
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_glfwInputError(GLFW_PLATFORM_ERROR, |
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"WGL: Failed to enable sharing with specified OpenGL context"); |
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return GLFW_FALSE; |
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} |
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} |
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} |
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return GLFW_TRUE; |
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} |
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#undef setWGLattrib |
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// Destroy the OpenGL context |
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// |
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void _glfwDestroyContext(_GLFWwindow* window) |
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{ |
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if (window->context.wgl.handle) |
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{ |
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_glfw_wglDeleteContext(window->context.wgl.handle); |
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window->context.wgl.handle = NULL; |
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} |
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} |
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// Analyzes the specified context for possible recreation |
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// |
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int _glfwAnalyzeContext(_GLFWwindow* window, |
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const _GLFWctxconfig* ctxconfig, |
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const _GLFWfbconfig* fbconfig) |
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{ |
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GLFWbool required = GLFW_FALSE; |
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|
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if (_glfw.wgl.extensionsLoaded) |
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return _GLFW_RECREATION_NOT_NEEDED; |
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_glfwPlatformMakeContextCurrent(window); |
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loadExtensions(); |
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if (ctxconfig->api == GLFW_OPENGL_API) |
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{ |
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if (ctxconfig->forward) |
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{ |
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if (!_glfw.wgl.ARB_create_context) |
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{ |
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_glfwInputError(GLFW_VERSION_UNAVAILABLE, |
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"WGL: A forward compatible OpenGL context requested but WGL_ARB_create_context is unavailable"); |
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return _GLFW_RECREATION_IMPOSSIBLE; |
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} |
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required = GLFW_TRUE; |
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} |
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if (ctxconfig->profile) |
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{ |
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if (!_glfw.wgl.ARB_create_context_profile) |
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{ |
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_glfwInputError(GLFW_VERSION_UNAVAILABLE, |
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"WGL: OpenGL profile requested but WGL_ARB_create_context_profile is unavailable"); |
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return _GLFW_RECREATION_IMPOSSIBLE; |
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} |
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required = GLFW_TRUE; |
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} |
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if (ctxconfig->release) |
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{ |
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if (_glfw.wgl.ARB_context_flush_control) |
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required = GLFW_TRUE; |
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} |
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} |
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else |
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{ |
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if (!_glfw.wgl.ARB_create_context || |
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!_glfw.wgl.ARB_create_context_profile || |
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!_glfw.wgl.EXT_create_context_es2_profile) |
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{ |
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_glfwInputError(GLFW_API_UNAVAILABLE, |
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"WGL: OpenGL ES requested but WGL_ARB_create_context_es2_profile is unavailable"); |
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return _GLFW_RECREATION_IMPOSSIBLE; |
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} |
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required = GLFW_TRUE; |
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} |
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if (ctxconfig->major != 1 || ctxconfig->minor != 0) |
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{ |
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if (_glfw.wgl.ARB_create_context) |
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required = GLFW_TRUE; |
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} |
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if (ctxconfig->debug) |
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{ |
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if (_glfw.wgl.ARB_create_context) |
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required = GLFW_TRUE; |
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} |
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|
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if (fbconfig->samples > 0) |
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{ |
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// MSAA is not a hard constraint, so do nothing if it's not supported |
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if (_glfw.wgl.ARB_multisample && _glfw.wgl.ARB_pixel_format) |
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required = GLFW_TRUE; |
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} |
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|
|
if (fbconfig->sRGB) |
|
{ |
|
// sRGB is not a hard constraint, so do nothing if it's not supported |
|
if ((_glfw.wgl.ARB_framebuffer_sRGB || |
|
_glfw.wgl.EXT_framebuffer_sRGB) && |
|
_glfw.wgl.ARB_pixel_format) |
|
{ |
|
required = GLFW_TRUE; |
|
} |
|
} |
|
|
|
if (required) |
|
return _GLFW_RECREATION_REQUIRED; |
|
|
|
return _GLFW_RECREATION_NOT_NEEDED; |
|
} |
|
|
|
|
|
////////////////////////////////////////////////////////////////////////// |
|
////// GLFW platform API ////// |
|
////////////////////////////////////////////////////////////////////////// |
|
|
|
void _glfwPlatformMakeContextCurrent(_GLFWwindow* window) |
|
{ |
|
if (window) |
|
{ |
|
_glfw_wglMakeCurrent(window->context.wgl.dc, |
|
window->context.wgl.handle); |
|
} |
|
else |
|
_glfw_wglMakeCurrent(NULL, NULL); |
|
|
|
_glfwSetContextTLS(window); |
|
} |
|
|
|
void _glfwPlatformSwapBuffers(_GLFWwindow* window) |
|
{ |
|
// HACK: Use DwmFlush when desktop composition is enabled |
|
if (_glfwIsCompositionEnabled() && !window->monitor) |
|
{ |
|
int count = abs(window->context.wgl.interval); |
|
while (count--) |
|
_glfw_DwmFlush(); |
|
} |
|
|
|
SwapBuffers(window->context.wgl.dc); |
|
} |
|
|
|
void _glfwPlatformSwapInterval(int interval) |
|
{ |
|
_GLFWwindow* window = _glfwPlatformGetCurrentContext(); |
|
|
|
window->context.wgl.interval = interval; |
|
|
|
// HACK: Disable WGL swap interval when desktop composition is enabled to |
|
// avoid interfering with DWM vsync |
|
if (_glfwIsCompositionEnabled() && !window->monitor) |
|
interval = 0; |
|
|
|
if (_glfw.wgl.EXT_swap_control) |
|
_glfw.wgl.SwapIntervalEXT(interval); |
|
} |
|
|
|
int _glfwPlatformExtensionSupported(const char* extension) |
|
{ |
|
const char* extensions; |
|
|
|
_GLFWwindow* window = _glfwPlatformGetCurrentContext(); |
|
|
|
if (_glfw.wgl.GetExtensionsStringEXT) |
|
{ |
|
extensions = _glfw.wgl.GetExtensionsStringEXT(); |
|
if (extensions) |
|
{ |
|
if (_glfwStringInExtensionString(extension, extensions)) |
|
return GLFW_TRUE; |
|
} |
|
} |
|
|
|
if (_glfw.wgl.GetExtensionsStringARB) |
|
{ |
|
extensions = _glfw.wgl.GetExtensionsStringARB(window->context.wgl.dc); |
|
if (extensions) |
|
{ |
|
if (_glfwStringInExtensionString(extension, extensions)) |
|
return GLFW_TRUE; |
|
} |
|
} |
|
|
|
return GLFW_FALSE; |
|
} |
|
|
|
GLFWglproc _glfwPlatformGetProcAddress(const char* procname) |
|
{ |
|
const GLFWglproc proc = (GLFWglproc) _glfw_wglGetProcAddress(procname); |
|
if (proc) |
|
return proc; |
|
|
|
return (GLFWglproc) GetProcAddress(_glfw.wgl.instance, procname); |
|
} |
|
|
|
|
|
////////////////////////////////////////////////////////////////////////// |
|
////// GLFW native API ////// |
|
////////////////////////////////////////////////////////////////////////// |
|
|
|
GLFWAPI HGLRC glfwGetWGLContext(GLFWwindow* handle) |
|
{ |
|
_GLFWwindow* window = (_GLFWwindow*) handle; |
|
_GLFW_REQUIRE_INIT_OR_RETURN(NULL); |
|
|
|
if (window->context.api == GLFW_NO_API) |
|
{ |
|
_glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL); |
|
return NULL; |
|
} |
|
|
|
return window->context.wgl.handle; |
|
} |
|
|
|
|