397 lines
9.6 KiB
C
397 lines
9.6 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 7.1
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*
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* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Test the GLX_EXT_texture_from_pixmap extension
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* Brian Paul
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* 19 May 2007
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*/
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#define GL_GLEXT_PROTOTYPES
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#define GLX_GLXEXT_PROTOTYPES
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#include <GL/gl.h>
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#include <GL/glx.h>
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#include <X11/keysym.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static float top, bottom;
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static PFNGLXBINDTEXIMAGEEXTPROC glXBindTexImageEXT_func = NULL;
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static PFNGLXRELEASETEXIMAGEEXTPROC glXReleaseTexImageEXT_func = NULL;
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static Display *
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OpenDisplay(void)
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{
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int screen;
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Display *dpy;
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const char *ext;
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dpy = XOpenDisplay(NULL);
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if (!dpy) {
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printf("Couldn't open default display!\n");
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exit(1);
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}
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screen = DefaultScreen(dpy);
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ext = glXQueryExtensionsString(dpy, screen);
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if (!strstr(ext, "GLX_EXT_texture_from_pixmap")) {
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fprintf(stderr, "GLX_EXT_texture_from_pixmap not supported.\n");
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exit(1);
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}
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glXBindTexImageEXT_func = (PFNGLXBINDTEXIMAGEEXTPROC)
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glXGetProcAddress((GLubyte *) "glXBindTexImageEXT");
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glXReleaseTexImageEXT_func = (PFNGLXRELEASETEXIMAGEEXTPROC)
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glXGetProcAddress((GLubyte*) "glXReleaseTexImageEXT");
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if (!glXBindTexImageEXT_func || !glXReleaseTexImageEXT_func) {
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fprintf(stderr, "glXGetProcAddress failed!\n");
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exit(1);
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}
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return dpy;
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}
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static GLXFBConfig
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ChoosePixmapFBConfig(Display *display)
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{
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int screen = DefaultScreen(display);
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GLXFBConfig *fbconfigs;
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int i, nfbconfigs = 0, value;
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fbconfigs = glXGetFBConfigs(display, screen, &nfbconfigs);
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for (i = 0; i < nfbconfigs; i++) {
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glXGetFBConfigAttrib(display, fbconfigs[i], GLX_DRAWABLE_TYPE, &value);
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if (!(value & GLX_PIXMAP_BIT))
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continue;
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glXGetFBConfigAttrib(display, fbconfigs[i],
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GLX_BIND_TO_TEXTURE_TARGETS_EXT, &value);
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if (!(value & GLX_TEXTURE_2D_BIT_EXT))
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continue;
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glXGetFBConfigAttrib(display, fbconfigs[i],
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GLX_BIND_TO_TEXTURE_RGBA_EXT, &value);
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if (value == False) {
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glXGetFBConfigAttrib(display, fbconfigs[i],
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GLX_BIND_TO_TEXTURE_RGB_EXT, &value);
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if (value == False)
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continue;
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}
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glXGetFBConfigAttrib(display, fbconfigs[i],
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GLX_Y_INVERTED_EXT, &value);
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if (value == True) {
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top = 0.0f;
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bottom = 1.0f;
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}
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else {
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top = 1.0f;
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bottom = 0.0f;
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}
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break;
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}
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if (i == nfbconfigs) {
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printf("Unable to find FBconfig for texturing\n");
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exit(1);
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}
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return fbconfigs[i];
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}
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static GLXPixmap
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CreatePixmap(Display *dpy, GLXFBConfig config, int w, int h, Pixmap *p)
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{
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GLXPixmap gp;
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const int pixmapAttribs[] = {
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GLX_TEXTURE_TARGET_EXT, GLX_TEXTURE_2D_EXT,
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GLX_TEXTURE_FORMAT_EXT, GLX_TEXTURE_FORMAT_RGB_EXT,
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None
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};
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Window root = RootWindow(dpy, 0);
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*p = XCreatePixmap(dpy, root, w, h, 24);
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XSync(dpy, 0);
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gp = glXCreatePixmap(dpy, config, *p, pixmapAttribs);
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XSync(dpy, 0);
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return gp;
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}
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static void
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DrawPixmapImage(Display *dpy, Pixmap pm, int w, int h)
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{
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XGCValues gcvals;
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GC gc;
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gcvals.background = 0;
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gc = XCreateGC(dpy, pm, GCBackground, &gcvals);
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XSetForeground(dpy, gc, 0x0);
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XFillRectangle(dpy, pm, gc, 0, 0, w, h);
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XSetForeground(dpy, gc, 0xff0000);
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XFillRectangle(dpy, pm, gc, 0, 0, 50, 50);
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XSetForeground(dpy, gc, 0x00ff00);
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XFillRectangle(dpy, pm, gc, w - 50, 0, 50, 50);
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XSetForeground(dpy, gc, 0x0000ff);
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XFillRectangle(dpy, pm, gc, 0, h - 50, 50, 50);
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XSetForeground(dpy, gc, 0xffffff);
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XFillRectangle(dpy, pm, gc, h - 50, h - 50, 50, 50);
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XSetForeground(dpy, gc, 0xffff00);
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XSetLineAttributes(dpy, gc, 3, LineSolid, CapButt, JoinBevel);
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XDrawLine(dpy, pm, gc, 0, 0, w, h);
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XDrawLine(dpy, pm, gc, 0, h, w, 0);
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XFreeGC(dpy, gc);
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}
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static XVisualInfo *
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ChooseWindowVisual(Display *dpy)
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{
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int screen = DefaultScreen(dpy);
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XVisualInfo *visinfo;
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int attribs[] = {
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GLX_RGBA,
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GLX_RED_SIZE, 1,
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GLX_GREEN_SIZE, 1,
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GLX_BLUE_SIZE, 1,
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GLX_DOUBLEBUFFER,
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None
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};
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visinfo = glXChooseVisual(dpy, screen, attribs);
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if (!visinfo) {
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printf("Unable to find RGB, double-buffered visual\n");
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exit(1);
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}
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return visinfo;
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}
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static Window
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CreateWindow(Display *dpy, XVisualInfo *visinfo,
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int width, int height, const char *name)
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{
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int screen = DefaultScreen(dpy);
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Window win;
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XSetWindowAttributes attr;
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unsigned long mask;
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Window root;
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root = RootWindow(dpy, screen);
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/* window attributes */
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attr.background_pixel = 0;
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attr.border_pixel = 0;
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attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
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attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
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mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
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win = XCreateWindow(dpy, root, 0, 0, width, height,
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0, visinfo->depth, InputOutput,
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visinfo->visual, mask, &attr);
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if (win) {
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XSizeHints sizehints;
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sizehints.width = width;
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sizehints.height = height;
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sizehints.flags = USSize;
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XSetNormalHints(dpy, win, &sizehints);
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XSetStandardProperties(dpy, win, name, name,
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None, (char **)NULL, 0, &sizehints);
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XMapWindow(dpy, win);
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}
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return win;
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}
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static void
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BindPixmapTexture(Display *dpy, GLXPixmap gp)
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{
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GLuint texture;
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glXBindTexImageEXT_func(dpy, gp, GLX_FRONT_LEFT_EXT, NULL);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glEnable(GL_TEXTURE_2D);
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/*
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glXReleaseTexImageEXT_func(display, glxpixmap, GLX_FRONT_LEFT_EXT);
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*/
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}
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static void
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Resize(Window win, unsigned int width, unsigned int height)
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{
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float sz = 1.5;
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glViewport(0, 0, width, height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-sz, sz, -sz, sz, -1.0, 1.0);
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glMatrixMode(GL_MODELVIEW);
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}
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static void
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Redraw(Display *dpy, Window win, float rot)
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{
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glClearColor(0.25, 0.25, 0.25, 0.0);
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glClear(GL_COLOR_BUFFER_BIT);
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glPushMatrix();
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glRotatef(rot, 0, 0, 1);
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glRotatef(2.0 * rot, 1, 0, 0);
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glBegin(GL_QUADS);
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glTexCoord2d(0.0, bottom);
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glVertex2f(-1, -1);
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glTexCoord2d(1.0, bottom);
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glVertex2f( 1, -1);
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glTexCoord2d(1.0, top);
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glVertex2d(1.0, 1.0);
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glTexCoord2d(0.0, top);
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glVertex2f(-1.0, 1.0);
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glEnd();
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glPopMatrix();
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glXSwapBuffers(dpy, win);
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}
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static void
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EventLoop(Display *dpy, Window win)
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{
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GLfloat rot = 0.0;
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int anim = 0;
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while (1) {
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if (!anim || XPending(dpy) > 0) {
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XEvent event;
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XNextEvent(dpy, &event);
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switch (event.type) {
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case Expose:
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Redraw(dpy, win, rot);
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break;
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case ConfigureNotify:
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Resize(event.xany.window,
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event.xconfigure.width,
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event.xconfigure.height);
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break;
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case KeyPress:
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{
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char buf[100];
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KeySym keySym;
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XComposeStatus stat;
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XLookupString(&event.xkey, buf, sizeof(buf), &keySym, &stat);
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if (keySym == XK_Escape) {
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return; /* exit */
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}
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else if (keySym == XK_r) {
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rot += 1.0;
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Redraw(dpy, win, rot);
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}
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else if (keySym == XK_a) {
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anim = !anim;
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}
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else if (keySym == XK_R) {
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rot -= 1.0;
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Redraw(dpy, win, rot);
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}
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}
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break;
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default:
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; /*no-op*/
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}
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}
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else {
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/* animate */
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rot += 1.0;
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Redraw(dpy, win, rot);
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}
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}
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}
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int
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main(int argc, char *argv[])
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{
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Display *dpy;
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GLXFBConfig pixmapConfig;
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XVisualInfo *windowVis;
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GLXPixmap gp;
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Window win;
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GLXContext ctx;
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Pixmap p;
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dpy = OpenDisplay();
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pixmapConfig = ChoosePixmapFBConfig(dpy);
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windowVis = ChooseWindowVisual(dpy);
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win = CreateWindow(dpy, windowVis, 500, 500, "Texture From Pixmap");
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gp = CreatePixmap(dpy, pixmapConfig, 512, 512, &p);
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DrawPixmapImage(dpy, p, 512, 512);
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ctx = glXCreateContext(dpy, windowVis, NULL, True);
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if (!ctx) {
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printf("Couldn't create GLX context\n");
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exit(1);
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}
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glXMakeCurrent(dpy, win, ctx);
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BindPixmapTexture(dpy, gp);
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EventLoop(dpy, win);
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return 0;
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}
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