625 lines
20 KiB
C
625 lines
20 KiB
C
//========================================================================
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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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#include <stdlib.h>
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#include <malloc.h>
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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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// 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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glfwMakeContextCurrent(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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// Prepare for creation of the OpenGL context
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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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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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// Destroy the OpenGL context
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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 == _glfwLibrary.currentWindow)
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glfwMakeContextCurrent(NULL);
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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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if (window->WGL.DC)
|
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{
|
|
ReleaseDC(window->Win32.handle, window->WGL.DC);
|
|
window->WGL.DC = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////
|
|
////// GLFW platform API //////
|
|
//////////////////////////////////////////////////////////////////////////
|
|
|
|
//========================================================================
|
|
// Make the OpenGL context associated with the specified window current
|
|
//========================================================================
|
|
|
|
void _glfwPlatformMakeContextCurrent(_GLFWwindow* window)
|
|
{
|
|
if (window)
|
|
wglMakeCurrent(window->WGL.DC, window->WGL.context);
|
|
else
|
|
wglMakeCurrent(NULL, NULL);
|
|
}
|
|
|
|
|
|
//========================================================================
|
|
// Swap buffers (double-buffering)
|
|
//========================================================================
|
|
|
|
void _glfwPlatformSwapBuffers(_GLFWwindow* window)
|
|
{
|
|
SwapBuffers(window->WGL.DC);
|
|
}
|
|
|
|
|
|
//========================================================================
|
|
// Set double buffering swap interval
|
|
//========================================================================
|
|
|
|
void _glfwPlatformSwapInterval(int interval)
|
|
{
|
|
_GLFWwindow* window = _glfwLibrary.currentWindow;
|
|
|
|
if (window->WGL.EXT_swap_control)
|
|
window->WGL.SwapIntervalEXT(interval);
|
|
}
|
|
|
|
|
|
//========================================================================
|
|
// Check if the current context supports the specified WGL extension
|
|
//========================================================================
|
|
|
|
int _glfwPlatformExtensionSupported(const char* extension)
|
|
{
|
|
const GLubyte* extensions;
|
|
|
|
_GLFWwindow* window = _glfwLibrary.currentWindow;
|
|
|
|
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");
|
|
}
|
|
}
|
|
|