glfw/src/wgl_context.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/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
#include "internal.h"
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#include <stdlib.h>
#include <malloc.h>
#include <assert.h>
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// Initialize WGL-specific extensions
// This function is called once before initial context creation, i.e. before
// any WGL extensions could be present. This is done in order to have both
// extension variable clearing and loading in the same place, hopefully
// decreasing the possibility of forgetting to add one without the other.
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//
static void initWGLExtensions(_GLFWwindow* window)
{
// This needs to include every function pointer loaded below
window->wgl.SwapIntervalEXT = NULL;
window->wgl.ChoosePixelFormatARB = NULL;
window->wgl.GetExtensionsStringARB = NULL;
window->wgl.GetExtensionsStringEXT = NULL;
window->wgl.CreateContextAttribsARB = NULL;
// This needs to include every extension used below except for
// WGL_ARB_extensions_string and WGL_EXT_extensions_string
window->wgl.ARB_multisample = GL_FALSE;
window->wgl.ARB_framebuffer_sRGB = GL_FALSE;
window->wgl.ARB_create_context = GL_FALSE;
window->wgl.ARB_create_context_profile = GL_FALSE;
window->wgl.EXT_create_context_es2_profile = GL_FALSE;
window->wgl.ARB_create_context_robustness = GL_FALSE;
window->wgl.EXT_swap_control = GL_FALSE;
window->wgl.ARB_pixel_format = GL_FALSE;
window->wgl.GetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC)
wglGetProcAddress("wglGetExtensionsStringEXT");
if (!window->wgl.GetExtensionsStringEXT)
{
window->wgl.GetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC)
wglGetProcAddress("wglGetExtensionsStringARB");
if (!window->wgl.GetExtensionsStringARB)
return;
}
if (_glfwPlatformExtensionSupported("WGL_ARB_multisample"))
window->wgl.ARB_multisample = GL_TRUE;
if (_glfwPlatformExtensionSupported("WGL_ARB_framebuffer_sRGB"))
window->wgl.ARB_framebuffer_sRGB = GL_TRUE;
if (_glfwPlatformExtensionSupported("WGL_ARB_create_context"))
{
window->wgl.CreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)
wglGetProcAddress("wglCreateContextAttribsARB");
if (window->wgl.CreateContextAttribsARB)
window->wgl.ARB_create_context = GL_TRUE;
}
if (window->wgl.ARB_create_context)
{
if (_glfwPlatformExtensionSupported("WGL_ARB_create_context_profile"))
window->wgl.ARB_create_context_profile = GL_TRUE;
}
if (window->wgl.ARB_create_context &&
window->wgl.ARB_create_context_profile)
{
if (_glfwPlatformExtensionSupported("WGL_EXT_create_context_es2_profile"))
window->wgl.EXT_create_context_es2_profile = GL_TRUE;
}
if (window->wgl.ARB_create_context)
{
if (_glfwPlatformExtensionSupported("WGL_ARB_create_context_robustness"))
window->wgl.ARB_create_context_robustness = GL_TRUE;
}
if (_glfwPlatformExtensionSupported("WGL_EXT_swap_control"))
{
window->wgl.SwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC)
wglGetProcAddress("wglSwapIntervalEXT");
if (window->wgl.SwapIntervalEXT)
window->wgl.EXT_swap_control = GL_TRUE;
}
if (_glfwPlatformExtensionSupported("WGL_ARB_pixel_format"))
{
window->wgl.ChoosePixelFormatARB = (PFNWGLCHOOSEPIXELFORMATARBPROC)
wglGetProcAddress("wglChoosePixelFormatARB");
if (window->wgl.ChoosePixelFormatARB)
window->wgl.ARB_pixel_format = GL_TRUE;
}
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
// Initialize WGL
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//
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int _glfwInitContextAPI(void)
{
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_glfw.wgl.current = TlsAlloc();
if (_glfw.wgl.current == TLS_OUT_OF_INDEXES)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"WGL: Failed to allocate TLS index");
return GL_FALSE;
}
_glfw.wgl.hasTLS = GL_TRUE;
return GL_TRUE;
}
// Terminate WGL
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//
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void _glfwTerminateContextAPI(void)
{
if (_glfw.wgl.hasTLS)
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TlsFree(_glfw.wgl.current);
}
#define setWGLattrib(attribName, attribValue) \
{ \
attribs[index++] = attribName; \
attribs[index++] = attribValue; \
assert(index < sizeof(attribs) / sizeof(attribs[0])); \
}
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// Prepare for creation of the OpenGL context
//
int _glfwCreateContext(_GLFWwindow* window,
const _GLFWwndconfig* wndconfig,
const _GLFWfbconfig* fbconfig)
{
int attribs[40];
int pixelFormat;
PIXELFORMATDESCRIPTOR pfd;
HGLRC share = NULL;
if (wndconfig->share)
share = wndconfig->share->wgl.context;
window->wgl.dc = GetDC(window->win32.handle);
if (!window->wgl.dc)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Win32: Failed to retrieve DC for window");
return GL_FALSE;
}
if (window->wgl.ARB_pixel_format)
{
int index = 0;
UINT count;
setWGLattrib(WGL_SUPPORT_OPENGL_ARB, TRUE);
setWGLattrib(WGL_DRAW_TO_WINDOW_ARB, TRUE);
setWGLattrib(WGL_PIXEL_TYPE_ARB, WGL_TYPE_RGBA_ARB);
setWGLattrib(WGL_DOUBLE_BUFFER_ARB, TRUE);
if (fbconfig->redBits)
setWGLattrib(WGL_RED_BITS_ARB, fbconfig->redBits);
if (fbconfig->greenBits)
setWGLattrib(WGL_GREEN_BITS_ARB, fbconfig->greenBits);
if (fbconfig->blueBits)
setWGLattrib(WGL_BLUE_BITS_ARB, fbconfig->blueBits);
if (fbconfig->alphaBits)
setWGLattrib(WGL_ALPHA_BITS_ARB, fbconfig->alphaBits);
if (fbconfig->depthBits)
setWGLattrib(WGL_DEPTH_BITS_ARB, fbconfig->depthBits);
if (fbconfig->stencilBits)
setWGLattrib(WGL_STENCIL_BITS_ARB, fbconfig->stencilBits);
if (fbconfig->auxBuffers)
setWGLattrib(WGL_AUX_BUFFERS_ARB, fbconfig->auxBuffers);
if (fbconfig->accumRedBits)
setWGLattrib(WGL_ACCUM_RED_BITS_ARB, fbconfig->accumRedBits);
if (fbconfig->accumGreenBits)
setWGLattrib(WGL_ACCUM_GREEN_BITS_ARB, fbconfig->accumGreenBits);
if (fbconfig->accumBlueBits)
setWGLattrib(WGL_ACCUM_BLUE_BITS_ARB, fbconfig->accumBlueBits);
if (fbconfig->accumAlphaBits)
setWGLattrib(WGL_ACCUM_BLUE_BITS_ARB, fbconfig->accumAlphaBits);
if (fbconfig->stereo)
setWGLattrib(WGL_STEREO_ARB, TRUE);
if (window->wgl.ARB_multisample)
{
if (fbconfig->samples)
{
setWGLattrib(WGL_SAMPLE_BUFFERS_ARB, 1);
setWGLattrib(WGL_SAMPLES_ARB, fbconfig->samples);
}
}
if (window->wgl.ARB_framebuffer_sRGB)
{
if (fbconfig->sRGB)
setWGLattrib(WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB, TRUE);
}
setWGLattrib(0, 0);
if (!window->wgl.ChoosePixelFormatARB(window->wgl.dc,
attribs,
NULL,
1,
&pixelFormat,
&count))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"WGL: Failed to find a suitable pixel format");
return GL_FALSE;
}
}
else
{
ZeroMemory(&pfd, sizeof(pfd));
pfd.nSize = sizeof(pfd);
pfd.nVersion = 1;
pfd.dwFlags |= PFD_DRAW_TO_WINDOW |
PFD_SUPPORT_OPENGL |
PFD_DOUBLEBUFFER;
if (fbconfig->stereo)
pfd.dwFlags |= PFD_STEREO;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = fbconfig->redBits +
fbconfig->greenBits +
fbconfig->blueBits;
pfd.cAlphaBits = fbconfig->alphaBits;
pfd.cAccumBits = fbconfig->accumRedBits +
fbconfig->accumGreenBits +
fbconfig->accumBlueBits;
pfd.cDepthBits = fbconfig->depthBits;
pfd.cStencilBits = fbconfig->stencilBits;
pfd.cAuxBuffers = fbconfig->auxBuffers;
pixelFormat = ChoosePixelFormat(window->wgl.dc, &pfd);
if (!pixelFormat)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"WGL: Failed to find a suitable pixel format");
return GL_FALSE;
}
}
if (!DescribePixelFormat(window->wgl.dc, pixelFormat, sizeof(pfd), &pfd))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Win32: Failed to retrieve PFD for selected pixel "
"format");
return GL_FALSE;
}
if (!(pfd.dwFlags & PFD_GENERIC_ACCELERATED) &&
(pfd.dwFlags & PFD_GENERIC_FORMAT))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Win32: Failed to find an accelerated pixel format");
return GL_FALSE;
}
if (!SetPixelFormat(window->wgl.dc, pixelFormat, &pfd))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Win32: Failed to set selected pixel format");
return GL_FALSE;
}
if (window->wgl.ARB_create_context)
{
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int index = 0, mask = 0, flags = 0, strategy = 0;
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if (wndconfig->clientAPI == GLFW_OPENGL_API)
{
if (wndconfig->glForward)
flags |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
if (wndconfig->glDebug)
flags |= WGL_CONTEXT_DEBUG_BIT_ARB;
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if (wndconfig->glProfile)
{
if (wndconfig->glProfile == GLFW_OPENGL_CORE_PROFILE)
mask |= WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
else if (wndconfig->glProfile == GLFW_OPENGL_COMPAT_PROFILE)
mask |= WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
}
}
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else
mask |= WGL_CONTEXT_ES2_PROFILE_BIT_EXT;
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if (wndconfig->glRobustness)
{
if (window->wgl.ARB_create_context_robustness)
{
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if (wndconfig->glRobustness == GLFW_NO_RESET_NOTIFICATION)
strategy = WGL_NO_RESET_NOTIFICATION_ARB;
else if (wndconfig->glRobustness == GLFW_LOSE_CONTEXT_ON_RESET)
strategy = WGL_LOSE_CONTEXT_ON_RESET_ARB;
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flags |= WGL_CONTEXT_ROBUST_ACCESS_BIT_ARB;
}
}
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if (wndconfig->glMajor != 1 || wndconfig->glMinor != 0)
{
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setWGLattrib(WGL_CONTEXT_MAJOR_VERSION_ARB, wndconfig->glMajor);
setWGLattrib(WGL_CONTEXT_MINOR_VERSION_ARB, wndconfig->glMinor);
}
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if (flags)
setWGLattrib(WGL_CONTEXT_FLAGS_ARB, flags);
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if (mask)
setWGLattrib(WGL_CONTEXT_PROFILE_MASK_ARB, mask);
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if (strategy)
setWGLattrib(WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB, strategy);
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setWGLattrib(0, 0);
window->wgl.context = window->wgl.CreateContextAttribsARB(window->wgl.dc,
share,
attribs);
if (!window->wgl.context)
{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"WGL: Failed to create OpenGL context");
return GL_FALSE;
}
}
else
{
window->wgl.context = wglCreateContext(window->wgl.dc);
if (!window->wgl.context)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"WGL: Failed to create OpenGL context");
return GL_FALSE;
}
if (share)
{
if (!wglShareLists(share, window->wgl.context))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"WGL: Failed to enable sharing with specified "
"OpenGL context");
return GL_FALSE;
}
}
}
_glfwPlatformMakeContextCurrent(window);
initWGLExtensions(window);
return GL_TRUE;
}
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#undef setWGLattrib
// Destroy the OpenGL context
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//
void _glfwDestroyContext(_GLFWwindow* window)
{
if (window->wgl.context)
{
wglDeleteContext(window->wgl.context);
window->wgl.context = NULL;
}
if (window->wgl.dc)
{
ReleaseDC(window->win32.handle, window->wgl.dc);
window->wgl.dc = NULL;
}
}
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// Analyzes the specified context for possible recreation
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//
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int _glfwAnalyzeContext(const _GLFWwindow* window,
const _GLFWwndconfig* wndconfig,
const _GLFWfbconfig* fbconfig)
{
GLboolean required = GL_FALSE;
if (wndconfig->clientAPI == GLFW_OPENGL_API)
{
if (wndconfig->glForward)
{
if (!window->wgl.ARB_create_context)
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{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"WGL: A forward compatible OpenGL context "
"requested but WGL_ARB_create_context is "
"unavailable");
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return _GLFW_RECREATION_IMPOSSIBLE;
}
required = GL_TRUE;
}
if (wndconfig->glProfile)
{
if (!window->wgl.ARB_create_context_profile)
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{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"WGL: OpenGL profile requested but "
"WGL_ARB_create_context_profile is unavailable");
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return _GLFW_RECREATION_IMPOSSIBLE;
}
required = GL_TRUE;
}
}
else
{
if (!window->wgl.ARB_create_context ||
!window->wgl.ARB_create_context_profile ||
!window->wgl.EXT_create_context_es2_profile)
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{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"WGL: OpenGL ES requested but "
"WGL_ARB_create_context_es2_profile is unavailable");
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return _GLFW_RECREATION_IMPOSSIBLE;
}
required = GL_TRUE;
}
if (wndconfig->glMajor != 1 || wndconfig->glMinor != 0)
{
if (window->wgl.ARB_create_context)
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required = GL_TRUE;
}
if (wndconfig->glDebug)
{
if (window->wgl.ARB_create_context)
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required = GL_TRUE;
}
if (fbconfig->samples > 0)
{
// We want FSAA, but can we get it?
// FSAA is not a hard constraint, so otherwise we just don't care
if (window->wgl.ARB_multisample && window->wgl.ARB_pixel_format)
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{
// We appear to have both the extension and the means to ask for it
required = GL_TRUE;
}
}
if (required)
return _GLFW_RECREATION_REQUIRED;
return _GLFW_RECREATION_NOT_NEEDED;
}
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//////////////////////////////////////////////////////////////////////////
////// GLFW platform API //////
//////////////////////////////////////////////////////////////////////////
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void _glfwPlatformMakeContextCurrent(_GLFWwindow* window)
{
if (window)
wglMakeCurrent(window->wgl.dc, window->wgl.context);
else
wglMakeCurrent(NULL, NULL);
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TlsSetValue(_glfw.wgl.current, window);
}
_GLFWwindow* _glfwPlatformGetCurrentContext(void)
{
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return TlsGetValue(_glfw.wgl.current);
}
void _glfwPlatformSwapBuffers(_GLFWwindow* window)
{
SwapBuffers(window->wgl.dc);
}
void _glfwPlatformSwapInterval(int interval)
{
_GLFWwindow* window = _glfwPlatformGetCurrentContext();
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if (_glfwIsCompositionEnabled())
{
// Don't enabled vsync when desktop compositing is enabled, as it leads
// to frame jitter
return;
}
if (window->wgl.EXT_swap_control)
window->wgl.SwapIntervalEXT(interval);
}
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int _glfwPlatformExtensionSupported(const char* extension)
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{
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const GLubyte* extensions;
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_GLFWwindow* window = _glfwPlatformGetCurrentContext();
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if (window->wgl.GetExtensionsStringEXT != NULL)
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{
extensions = (GLubyte*) window->wgl.GetExtensionsStringEXT();
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if (extensions != NULL)
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{
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if (_glfwStringInExtensionString(extension, extensions))
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return GL_TRUE;
}
}
if (window->wgl.GetExtensionsStringARB != NULL)
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{
extensions = (GLubyte*) window->wgl.GetExtensionsStringARB(window->wgl.dc);
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if (extensions != NULL)
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{
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if (_glfwStringInExtensionString(extension, extensions))
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return GL_TRUE;
}
}
return GL_FALSE;
}
GLFWglproc _glfwPlatformGetProcAddress(const char* procname)
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{
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return (GLFWglproc) wglGetProcAddress(procname);
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}
//////////////////////////////////////////////////////////////////////////
////// GLFW native API //////
//////////////////////////////////////////////////////////////////////////
GLFWAPI HGLRC glfwGetWGLContext(GLFWwindow* handle)
{
_GLFWwindow* window = (_GLFWwindow*) handle;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
return window->wgl.context;
}