1 /* 2 * Copyright © 2009, 2013 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 */ 23 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <X11/Xlib.h> 27 #include "glx_common.h" 28 29 Display * get_display_or_skip(void)30 get_display_or_skip(void) 31 { 32 Display *dpy = XOpenDisplay(NULL); 33 34 if (!dpy) { 35 fputs("couldn't open display\n", stderr); 36 exit(77); 37 } 38 39 return dpy; 40 } 41 42 XVisualInfo * get_glx_visual(Display * dpy)43 get_glx_visual(Display *dpy) 44 { 45 XVisualInfo *visinfo; 46 int attrib[] = { 47 GLX_RGBA, 48 GLX_RED_SIZE, 1, 49 GLX_GREEN_SIZE, 1, 50 GLX_BLUE_SIZE, 1, 51 GLX_DOUBLEBUFFER, 52 None 53 }; 54 int screen = DefaultScreen(dpy); 55 56 visinfo = glXChooseVisual(dpy, screen, attrib); 57 if (visinfo == NULL) { 58 fputs("Couldn't get an RGBA, double-buffered visual\n", stderr); 59 exit(1); 60 } 61 62 return visinfo; 63 } 64 65 Window get_glx_window(Display * dpy,XVisualInfo * visinfo,bool map)66 get_glx_window(Display *dpy, XVisualInfo *visinfo, bool map) 67 { 68 XSetWindowAttributes window_attr; 69 unsigned long mask; 70 int screen = DefaultScreen(dpy); 71 Window root_win = RootWindow(dpy, screen); 72 Window win; 73 74 window_attr.background_pixel = 0; 75 window_attr.border_pixel = 0; 76 window_attr.colormap = XCreateColormap(dpy, root_win, 77 visinfo->visual, AllocNone); 78 window_attr.event_mask = StructureNotifyMask | ExposureMask | 79 KeyPressMask; 80 mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask; 81 win = XCreateWindow(dpy, root_win, 0, 0, 82 10, 10, /* width, height */ 83 0, visinfo->depth, InputOutput, 84 visinfo->visual, mask, &window_attr); 85 86 return win; 87 } 88 89 void make_glx_context_current_or_skip(Display * dpy)90 make_glx_context_current_or_skip(Display *dpy) 91 { 92 GLXContext ctx; 93 XVisualInfo *visinfo = get_glx_visual(dpy); 94 Window win = get_glx_window(dpy, visinfo, false); 95 96 ctx = glXCreateContext(dpy, visinfo, False, True); 97 if (ctx == None) { 98 fputs("glXCreateContext failed\n", stderr); 99 exit(1); 100 } 101 102 glXMakeCurrent(dpy, win, ctx); 103 } 104 105 GLXFBConfig get_fbconfig_for_visinfo(Display * dpy,XVisualInfo * visinfo)106 get_fbconfig_for_visinfo(Display *dpy, XVisualInfo *visinfo) 107 { 108 int i, nconfigs; 109 GLXFBConfig ret = None, *configs; 110 111 configs = glXGetFBConfigs(dpy, visinfo->screen, &nconfigs); 112 if (!configs) 113 return None; 114 115 for (i = 0; i < nconfigs; i++) { 116 int v; 117 118 if (glXGetFBConfigAttrib(dpy, configs[i], GLX_VISUAL_ID, &v)) 119 continue; 120 121 if (v == visinfo->visualid) { 122 ret = configs[i]; 123 break; 124 } 125 } 126 127 XFree(configs); 128 return ret; 129 } 130