forked from AuroraMiddleware/gtk
730 lines
23 KiB
C
730 lines
23 KiB
C
/* GDK - The GIMP Drawing Kit
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*
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* gdkglcontext-win32.c: Win32 specific OpenGL wrappers
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*
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* Copyright © 2014 Emmanuele Bassi
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* Copyright © 2014 Alexander Larsson
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* Copyright © 2014 Chun-wei Fan
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gdkprivate-win32.h"
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#include "gdksurface-win32.h"
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#include "gdkglcontext-win32.h"
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#include "gdkdisplay-win32.h"
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#include "gdkwin32display.h"
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#include "gdkwin32glcontext.h"
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#include "gdkwin32misc.h"
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#include "gdkwin32screen.h"
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#include "gdkwin32surface.h"
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#include "gdkglcontext.h"
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#include "gdkprofilerprivate.h"
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#include <glib/gi18n-lib.h>
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#include "gdksurface.h"
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#include <cairo.h>
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#include <epoxy/wgl.h>
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struct _GdkWin32GLContextWGL
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{
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GdkWin32GLContext parent_instance;
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HGLRC wgl_context;
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guint do_frame_sync : 1;
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};
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typedef struct _GdkWin32GLContextClass GdkWin32GLContextWGLClass;
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G_DEFINE_TYPE (GdkWin32GLContextWGL, gdk_win32_gl_context_wgl, GDK_TYPE_WIN32_GL_CONTEXT)
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static void
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gdk_win32_gl_context_wgl_dispose (GObject *gobject)
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{
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GdkWin32GLContextWGL *context_wgl = GDK_WIN32_GL_CONTEXT_WGL (gobject);
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if (context_wgl->wgl_context != NULL)
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{
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if (wglGetCurrentContext () == context_wgl->wgl_context)
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wglMakeCurrent (NULL, NULL);
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GDK_NOTE (OPENGL, g_print ("Destroying WGL context\n"));
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wglDeleteContext (context_wgl->wgl_context);
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context_wgl->wgl_context = NULL;
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}
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G_OBJECT_CLASS (gdk_win32_gl_context_wgl_parent_class)->dispose (gobject);
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}
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static void
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gdk_win32_gl_context_wgl_end_frame (GdkDrawContext *draw_context,
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cairo_region_t *painted)
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{
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GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
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GdkWin32GLContextWGL *context_wgl = GDK_WIN32_GL_CONTEXT_WGL (context);
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GdkSurface *surface = gdk_gl_context_get_surface (context);
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GdkWin32Display *display_win32 = (GDK_WIN32_DISPLAY (gdk_gl_context_get_display (context)));
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gboolean can_wait = display_win32->hasWglOMLSyncControl;
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HDC hdc;
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GDK_DRAW_CONTEXT_CLASS (gdk_win32_gl_context_wgl_parent_class)->end_frame (draw_context, painted);
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gdk_gl_context_make_current (context);
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gdk_profiler_add_mark (GDK_PROFILER_CURRENT_TIME, 0, "win32", "swap buffers");
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if (surface != NULL)
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hdc = GDK_WIN32_SURFACE (surface)->hdc;
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else
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hdc = display_win32->dummy_context_wgl.hdc;
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if (context_wgl->do_frame_sync)
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{
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glFinish ();
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if (can_wait)
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{
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gint64 ust, msc, sbc;
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wglGetSyncValuesOML (hdc, &ust, &msc, &sbc);
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wglWaitForMscOML (hdc,
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0,
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2,
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(msc + 1) % 2,
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&ust, &msc, &sbc);
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}
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}
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SwapBuffers (hdc);
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}
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static void
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gdk_win32_gl_context_wgl_begin_frame (GdkDrawContext *draw_context,
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gboolean prefers_high_depth,
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cairo_region_t *update_area)
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{
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gdk_win32_surface_handle_queued_move_resize (draw_context);
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GDK_DRAW_CONTEXT_CLASS (gdk_win32_gl_context_wgl_parent_class)->begin_frame (draw_context, prefers_high_depth, update_area);
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}
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static int
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gdk_init_dummy_wgl_context (GdkWin32Display *display_win32);
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#define PIXEL_ATTRIBUTES 17
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static int
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get_wgl_pfd (HDC hdc,
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PIXELFORMATDESCRIPTOR *pfd,
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GdkWin32Display *display_win32)
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{
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int best_pf = 0;
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pfd->nSize = sizeof (PIXELFORMATDESCRIPTOR);
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if (display_win32 != NULL && display_win32->hasWglARBPixelFormat)
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{
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UINT num_formats;
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int colorbits = GetDeviceCaps (hdc, BITSPIXEL);
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int i = 0;
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int pixelAttribs[PIXEL_ATTRIBUTES];
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/* Save up the HDC and HGLRC that we are currently using, to restore back to it when we are done here */
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HDC hdc_current = wglGetCurrentDC ();
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HGLRC hglrc_current = wglGetCurrentContext ();
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/* Update PIXEL_ATTRIBUTES above if any groups are added here! */
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pixelAttribs[i] = WGL_DRAW_TO_WINDOW_ARB;
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pixelAttribs[i++] = GL_TRUE;
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pixelAttribs[i++] = WGL_SUPPORT_OPENGL_ARB;
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pixelAttribs[i++] = GL_TRUE;
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pixelAttribs[i++] = WGL_DOUBLE_BUFFER_ARB;
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pixelAttribs[i++] = GL_TRUE;
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pixelAttribs[i++] = WGL_ACCELERATION_ARB;
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pixelAttribs[i++] = WGL_FULL_ACCELERATION_ARB;
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pixelAttribs[i++] = WGL_PIXEL_TYPE_ARB;
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pixelAttribs[i++] = WGL_TYPE_RGBA_ARB;
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pixelAttribs[i++] = WGL_COLOR_BITS_ARB;
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pixelAttribs[i++] = colorbits;
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/* end of "Update PIXEL_ATTRIBUTES above if any groups are added here!" */
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if (display_win32->hasWglARBmultisample)
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{
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pixelAttribs[i++] = WGL_SAMPLE_BUFFERS_ARB;
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pixelAttribs[i++] = 1;
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pixelAttribs[i++] = WGL_SAMPLES_ARB;
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pixelAttribs[i++] = 8;
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}
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pixelAttribs[i++] = 0; /* end of pixelAttribs */
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best_pf = gdk_init_dummy_wgl_context (display_win32);
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if (!wglMakeCurrent (display_win32->dummy_context_wgl.hdc,
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display_win32->dummy_context_wgl.hglrc))
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{
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wglMakeCurrent (hdc_current, hglrc_current);
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return 0;
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}
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wglChoosePixelFormatARB (hdc,
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pixelAttribs,
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NULL,
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1,
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&best_pf,
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&num_formats);
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/* Go back to the HDC that we were using, since we are done with the dummy HDC and GL Context */
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wglMakeCurrent (hdc_current, hglrc_current);
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}
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else
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{
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pfd->nVersion = 1;
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pfd->dwFlags = PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER;
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pfd->iPixelType = PFD_TYPE_RGBA;
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pfd->cColorBits = GetDeviceCaps (hdc, BITSPIXEL);
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pfd->cAlphaBits = 8;
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pfd->dwLayerMask = PFD_MAIN_PLANE;
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best_pf = ChoosePixelFormat (hdc, pfd);
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}
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return best_pf;
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}
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/* in WGL, for many OpenGL items, we need a dummy WGL context, so create
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* one and cache it for later use
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*/
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static int
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gdk_init_dummy_wgl_context (GdkWin32Display *display_win32)
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{
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PIXELFORMATDESCRIPTOR pfd;
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gboolean set_pixel_format_result = FALSE;
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int best_idx = 0;
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memset (&pfd, 0, sizeof (PIXELFORMATDESCRIPTOR));
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best_idx = get_wgl_pfd (display_win32->dummy_context_wgl.hdc, &pfd, NULL);
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if (best_idx != 0)
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set_pixel_format_result = SetPixelFormat (display_win32->dummy_context_wgl.hdc,
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best_idx,
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&pfd);
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if (best_idx == 0 || !set_pixel_format_result)
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return 0;
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display_win32->dummy_context_wgl.hglrc =
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wglCreateContext (display_win32->dummy_context_wgl.hdc);
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if (display_win32->dummy_context_wgl.hglrc == NULL)
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return 0;
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return best_idx;
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}
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gboolean
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gdk_win32_display_init_wgl (GdkDisplay *display,
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GError **error)
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{
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int best_idx = 0;
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GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
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HDC hdc;
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if (!gdk_gl_backend_can_be_used (GDK_GL_WGL, error))
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return FALSE;
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/* acquire and cache dummy Window (HWND & HDC) and
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* dummy GL Context, it is used to query functions
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* and used for other stuff as well
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*/
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best_idx = gdk_init_dummy_wgl_context (display_win32);
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hdc = display_win32->dummy_context_wgl.hdc;
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if (best_idx == 0 ||
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!wglMakeCurrent (hdc, display_win32->dummy_context_wgl.hglrc))
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{
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if (display_win32->dummy_context_wgl.hglrc != NULL)
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wglDeleteContext (display_win32->dummy_context_wgl.hglrc);
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g_set_error_literal (error, GDK_GL_ERROR,
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GDK_GL_ERROR_NOT_AVAILABLE,
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_("No GL implementation is available"));
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return FALSE;
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}
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display_win32->gl_version = epoxy_gl_version ();
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/* We must have OpenGL/WGL 2.0 or later, or have the GL_ARB_shader_objects extension */
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if (display_win32->gl_version < 20)
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{
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if (!epoxy_has_gl_extension ("GL_ARB_shader_objects"))
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{
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wglMakeCurrent (NULL, NULL);
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wglDeleteContext (display_win32->dummy_context_wgl.hglrc);
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g_set_error_literal (error, GDK_GL_ERROR,
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GDK_GL_ERROR_NOT_AVAILABLE,
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_("No GL implementation is available"));
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return FALSE;
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}
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}
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display_win32->hasWglARBCreateContext =
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epoxy_has_wgl_extension (hdc, "WGL_ARB_create_context");
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display_win32->hasWglEXTSwapControl =
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epoxy_has_wgl_extension (hdc, "WGL_EXT_swap_control");
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display_win32->hasWglOMLSyncControl =
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epoxy_has_wgl_extension (hdc, "WGL_OML_sync_control");
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display_win32->hasWglARBPixelFormat =
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epoxy_has_wgl_extension (hdc, "WGL_ARB_pixel_format");
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display_win32->hasWglARBmultisample =
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epoxy_has_wgl_extension (hdc, "WGL_ARB_multisample");
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GDK_NOTE (OPENGL,
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g_print ("WGL API version %d.%d found\n"
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" - Vendor: %s\n"
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" - Checked extensions:\n"
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"\t* WGL_ARB_pixel_format: %s\n"
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"\t* WGL_ARB_create_context: %s\n"
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"\t* WGL_EXT_swap_control: %s\n"
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"\t* WGL_OML_sync_control: %s\n"
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"\t* WGL_ARB_multisample: %s\n",
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display_win32->gl_version / 10,
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display_win32->gl_version % 10,
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glGetString (GL_VENDOR),
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display_win32->hasWglARBPixelFormat ? "yes" : "no",
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display_win32->hasWglARBCreateContext ? "yes" : "no",
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display_win32->hasWglEXTSwapControl ? "yes" : "no",
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display_win32->hasWglOMLSyncControl ? "yes" : "no",
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display_win32->hasWglARBmultisample ? "yes" : "no"));
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wglMakeCurrent (NULL, NULL);
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return TRUE;
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}
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/* Setup the legacy context after creating it */
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static gboolean
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ensure_legacy_wgl_context (HDC hdc,
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HGLRC hglrc_legacy,
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GdkGLContext *share)
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{
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GdkWin32GLContextWGL *context_wgl;
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if (!wglMakeCurrent (hdc, hglrc_legacy))
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return FALSE;
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if (share != NULL)
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{
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context_wgl = GDK_WIN32_GL_CONTEXT_WGL (share);
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return wglShareLists (hglrc_legacy, context_wgl->wgl_context);
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}
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return TRUE;
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}
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static HGLRC
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create_wgl_context_with_attribs (HDC hdc,
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HGLRC hglrc_base,
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GdkGLContext *share,
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int flags,
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int major,
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int minor,
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gboolean *is_legacy)
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{
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HGLRC hglrc;
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GdkWin32GLContextWGL *context_wgl;
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/* if we have wglCreateContextAttribsARB(), create a
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* context with the compatibility profile if a legacy
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* context is requested, or when we go into fallback mode
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*/
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int profile = *is_legacy ? WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB :
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WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
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int attribs[] = {
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WGL_CONTEXT_PROFILE_MASK_ARB, profile,
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WGL_CONTEXT_MAJOR_VERSION_ARB, *is_legacy ? 3 : major,
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WGL_CONTEXT_MINOR_VERSION_ARB, *is_legacy ? 0 : minor,
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WGL_CONTEXT_FLAGS_ARB, flags,
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0
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};
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if (share != NULL)
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context_wgl = GDK_WIN32_GL_CONTEXT_WGL (share);
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hglrc = wglCreateContextAttribsARB (hdc,
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share != NULL ? context_wgl->wgl_context : NULL,
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attribs);
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return hglrc;
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}
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static HGLRC
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create_wgl_context (HDC hdc,
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GdkGLContext *share,
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int flags,
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int major,
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int minor,
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gboolean *is_legacy,
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gboolean hasWglARBCreateContext)
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{
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/* We need a legacy context for *all* cases */
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HGLRC hglrc_base = wglCreateContext (hdc);
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gboolean success = TRUE;
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/* Save up the HDC and HGLRC that we are currently using, to restore back to it when we are done here */
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HDC hdc_current = wglGetCurrentDC ();
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HGLRC hglrc_current = wglGetCurrentContext ();
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/* if we have no wglCreateContextAttribsARB(), return the legacy context when all is set */
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if (*is_legacy && !hasWglARBCreateContext)
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{
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if (ensure_legacy_wgl_context (hdc, hglrc_base, share))
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{
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wglMakeCurrent (hdc_current, hglrc_current);
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return hglrc_base;
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}
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success = FALSE;
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goto gl_fail;
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}
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else
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{
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HGLRC hglrc = NULL;
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if (!wglMakeCurrent (hdc, hglrc_base))
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{
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success = FALSE;
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goto gl_fail;
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}
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hglrc = create_wgl_context_with_attribs (hdc,
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hglrc_base,
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share,
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flags,
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major,
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minor,
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is_legacy);
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/* return the legacy context we have if it could be setup properly, in case the 3.0+ context creation failed */
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if (hglrc == NULL)
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{
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if (!(*is_legacy))
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{
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/* If we aren't using a legacy context in the beginning, try again with a compatibility profile 3.0 context */
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hglrc = create_wgl_context_with_attribs (hdc,
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hglrc_base,
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share,
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flags,
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0, 0,
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is_legacy);
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*is_legacy = TRUE;
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}
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if (hglrc == NULL)
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{
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if (!ensure_legacy_wgl_context (hdc, hglrc_base, share))
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success = FALSE;
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}
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if (success)
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GDK_NOTE (OPENGL, g_print ("Using legacy context as fallback\n"));
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}
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gl_fail:
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if (!success)
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{
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wglMakeCurrent (NULL, NULL);
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wglDeleteContext (hglrc_base);
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return NULL;
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}
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wglMakeCurrent (hdc_current, hglrc_current);
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if (hglrc != NULL)
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{
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wglDeleteContext (hglrc_base);
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return hglrc;
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}
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return hglrc_base;
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}
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}
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static gboolean
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set_wgl_pixformat_for_hdc (HDC hdc,
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int *best_idx,
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GdkWin32Display *display_win32)
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{
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gboolean already_checked = TRUE;
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*best_idx = GetPixelFormat (hdc);
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/* one is only allowed to call SetPixelFormat(), and so ChoosePixelFormat()
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* one single time per window HDC
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*/
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if (*best_idx == 0)
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{
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PIXELFORMATDESCRIPTOR pfd;
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gboolean set_pixel_format_result = FALSE;
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GDK_NOTE (OPENGL, g_print ("requesting pixel format...\n"));
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already_checked = FALSE;
|
|
*best_idx = get_wgl_pfd (hdc, &pfd, display_win32);
|
|
|
|
if (*best_idx != 0)
|
|
set_pixel_format_result = SetPixelFormat (hdc, *best_idx, &pfd);
|
|
|
|
/* ChoosePixelFormat() or SetPixelFormat() failed, bail out */
|
|
if (*best_idx == 0 || !set_pixel_format_result)
|
|
return FALSE;
|
|
}
|
|
|
|
GDK_NOTE (OPENGL, g_print ("%s""requested and set pixel format: %d\n", already_checked ? "already " : "", *best_idx));
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static GdkGLAPI
|
|
gdk_win32_gl_context_wgl_realize (GdkGLContext *context,
|
|
GError **error)
|
|
{
|
|
GdkWin32GLContextWGL *context_wgl = GDK_WIN32_GL_CONTEXT_WGL (context);
|
|
|
|
gboolean debug_bit, compat_bit, legacy_bit;
|
|
|
|
/* request flags and specific versions for core (3.2+) WGL context */
|
|
int flags = 0;
|
|
int major = 0;
|
|
int minor = 0;
|
|
HGLRC hglrc;
|
|
int pixel_format;
|
|
HDC hdc;
|
|
|
|
GdkSurface *surface = gdk_gl_context_get_surface (context);
|
|
GdkDisplay *display = gdk_gl_context_get_display (context);
|
|
GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
|
|
GdkGLContext *share = gdk_display_get_gl_context (display);
|
|
|
|
if (!gdk_gl_context_is_api_allowed (context, GDK_GL_API_GL, error))
|
|
return 0;
|
|
|
|
debug_bit = gdk_gl_context_get_debug_enabled (context);
|
|
compat_bit = gdk_gl_context_get_forward_compatible (context);
|
|
|
|
/*
|
|
* We may need a Core GL 4.1+ context in order to use the GL support in
|
|
* the GStreamer media widget backend (such as on Intel drivers), but
|
|
* wglCreateContextAttribsARB() may only give us the GL context version
|
|
* that we ask for here, and nothing more. So, improve things here by
|
|
* asking for the GL version that is reported to us via epoxy_gl_version(),
|
|
* rather than the default GL core 3.2 context.
|
|
*/
|
|
gdk_gl_context_get_clipped_version (context,
|
|
display_win32->gl_version / 10,
|
|
display_win32->gl_version % 10,
|
|
&major, &minor);
|
|
|
|
if (surface != NULL)
|
|
hdc = GDK_WIN32_SURFACE (surface)->hdc;
|
|
else
|
|
hdc = display_win32->dummy_context_wgl.hdc;
|
|
|
|
/*
|
|
* A legacy context cannot be shared with core profile ones, so this means we
|
|
* must stick to a legacy context if the shared context is a legacy context
|
|
*/
|
|
legacy_bit = (gdk_display_get_debug_flags (display) & GDK_DEBUG_GL_LEGACY)
|
|
? TRUE
|
|
: share != NULL && gdk_gl_context_is_legacy (share);
|
|
|
|
if (!set_wgl_pixformat_for_hdc (hdc,
|
|
&pixel_format,
|
|
display_win32))
|
|
{
|
|
g_set_error_literal (error, GDK_GL_ERROR,
|
|
GDK_GL_ERROR_UNSUPPORTED_FORMAT,
|
|
_("No available configurations for the given pixel format"));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* if there isn't wglCreateContextAttribsARB() on WGL, use a legacy context */
|
|
if (!legacy_bit)
|
|
legacy_bit = !display_win32->hasWglARBCreateContext;
|
|
if (debug_bit)
|
|
flags |= WGL_CONTEXT_DEBUG_BIT_ARB;
|
|
if (compat_bit)
|
|
flags |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
|
|
|
|
GDK_NOTE (OPENGL,
|
|
g_print ("Creating %s WGL context (version:%d.%d, debug:%s, forward:%s, legacy: %s)\n",
|
|
compat_bit ? "core" : "compat",
|
|
major,
|
|
minor,
|
|
debug_bit ? "yes" : "no",
|
|
compat_bit ? "yes" : "no",
|
|
legacy_bit ? "yes" : "no"));
|
|
|
|
hglrc = create_wgl_context (hdc,
|
|
share,
|
|
flags,
|
|
major,
|
|
minor,
|
|
&legacy_bit,
|
|
display_win32->hasWglARBCreateContext);
|
|
|
|
if (hglrc == NULL)
|
|
{
|
|
g_set_error_literal (error, GDK_GL_ERROR,
|
|
GDK_GL_ERROR_NOT_AVAILABLE,
|
|
_("Unable to create a GL context"));
|
|
return 0;
|
|
}
|
|
|
|
GDK_NOTE (OPENGL,
|
|
g_print ("Created WGL context[%p], pixel_format=%d\n",
|
|
hglrc,
|
|
pixel_format));
|
|
|
|
context_wgl->wgl_context = hglrc;
|
|
|
|
/* Ensure that any other context is created with a legacy bit set */
|
|
gdk_gl_context_set_is_legacy (context, legacy_bit);
|
|
|
|
return GDK_GL_API_GL;
|
|
}
|
|
|
|
static gboolean
|
|
gdk_win32_gl_context_wgl_clear_current (GdkGLContext *context)
|
|
{
|
|
return wglMakeCurrent (NULL, NULL);
|
|
}
|
|
|
|
static gboolean
|
|
gdk_win32_gl_context_wgl_make_current (GdkGLContext *context,
|
|
gboolean surfaceless)
|
|
{
|
|
GdkWin32GLContextWGL *context_wgl = GDK_WIN32_GL_CONTEXT_WGL (context);
|
|
GdkDisplay *display = gdk_gl_context_get_display (context);
|
|
GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
|
|
GdkSurface *surface = gdk_gl_context_get_surface (context);
|
|
HDC hdc;
|
|
|
|
if (surfaceless || surface == NULL)
|
|
hdc = display_win32->dummy_context_wgl.hdc;
|
|
else
|
|
hdc = GDK_WIN32_SURFACE (surface)->hdc;
|
|
|
|
if (!wglMakeCurrent (hdc, context_wgl->wgl_context))
|
|
return FALSE;
|
|
|
|
if (!surfaceless && display_win32->hasWglEXTSwapControl)
|
|
{
|
|
gboolean do_frame_sync = FALSE;
|
|
|
|
/* If there is compositing there is no particular need to delay
|
|
* the swap when drawing on the offscreen, rendering to the screen
|
|
* happens later anyway, and its up to the compositor to sync that
|
|
* to the vblank. */
|
|
do_frame_sync = ! gdk_display_is_composited (display);
|
|
|
|
if (do_frame_sync != context_wgl->do_frame_sync)
|
|
{
|
|
context_wgl->do_frame_sync = do_frame_sync;
|
|
|
|
wglSwapIntervalEXT (do_frame_sync ? 1 : 0);
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
gdk_win32_gl_context_wgl_class_init (GdkWin32GLContextWGLClass *klass)
|
|
{
|
|
GdkGLContextClass *context_class = GDK_GL_CONTEXT_CLASS (klass);
|
|
GdkDrawContextClass *draw_context_class = GDK_DRAW_CONTEXT_CLASS (klass);
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
|
|
|
|
context_class->backend_type = GDK_GL_WGL;
|
|
|
|
context_class->realize = gdk_win32_gl_context_wgl_realize;
|
|
context_class->make_current = gdk_win32_gl_context_wgl_make_current;
|
|
context_class->clear_current = gdk_win32_gl_context_wgl_clear_current;
|
|
|
|
draw_context_class->begin_frame = gdk_win32_gl_context_wgl_begin_frame;
|
|
draw_context_class->end_frame = gdk_win32_gl_context_wgl_end_frame;
|
|
gobject_class->dispose = gdk_win32_gl_context_wgl_dispose;
|
|
}
|
|
|
|
static void
|
|
gdk_win32_gl_context_wgl_init (GdkWin32GLContextWGL *wgl_context)
|
|
{
|
|
}
|
|
|
|
|
|
/**
|
|
* gdk_win32_display_get_wgl_version:
|
|
* @display: a `GdkDisplay`
|
|
* @major: (out): return location for the WGL major version
|
|
* @minor: (out): return location for the WGL minor version
|
|
*
|
|
* Retrieves the version of the WGL implementation.
|
|
*
|
|
* Returns: %TRUE if WGL is available
|
|
*/
|
|
gboolean
|
|
gdk_win32_display_get_wgl_version (GdkDisplay *display,
|
|
int *major,
|
|
int *minor)
|
|
{
|
|
GdkWin32Display *display_win32;
|
|
g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
|
|
|
|
if (!GDK_IS_WIN32_DISPLAY (display))
|
|
return FALSE;
|
|
|
|
if (!gdk_gl_backend_can_be_used (GDK_GL_WGL, NULL))
|
|
return FALSE;
|
|
|
|
display_win32 = GDK_WIN32_DISPLAY (display);
|
|
|
|
if (major != NULL)
|
|
*major = display_win32->gl_version / 10;
|
|
if (minor != NULL)
|
|
*minor = display_win32->gl_version % 10;
|
|
|
|
return TRUE;
|
|
}
|