GLX_EXT_texture_from_pixmap test

1 files changed, 381 insertions, 0 deletions

diff --git a/progs/xdemos/texture_from_pixmap.c b/progs/xdemos/texture_from_pixmap.c
new file mode 100644
index 00000000000..22229567036
--- /dev/null
+++ b/progs/xdemos/texture_from_pixmap.c
@@ -0,0 +1,381 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.1
+ * 
+ * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*
+ * Test the GLX_EXT_texture_from_pixmap extension
+ * Brian Paul
+ * 19 May 2007
+ */
+
+
+#define GL_GLEXT_PROTOTYPES
+#define GLX_GLXEXT_PROTOTYPES
+#include <GL/gl.h>
+#include <GL/glx.h>
+#include <X11/keysym.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+static Display *
+OpenDisplay(void)
+{
+   int screen;
+   Display *dpy;
+   const char *ext;
+
+   dpy = XOpenDisplay(NULL);
+   if (!dpy) {
+      printf("Couldn't open default display!\n");
+      exit(1);
+   }
+
+   screen = DefaultScreen(dpy);
+   ext = glXQueryExtensionsString(dpy, screen);
+   if (!strstr(ext, "GLX_EXT_texture_from_pixmap")) {
+      printf("GLX_EXT_texture_from_pixmap not supported by GLX\n");
+      exit(1);
+   }
+
+   return dpy;
+}
+
+
+static GLXFBConfig
+ChoosePixmapFBConfig(Display *display)
+{
+   int screen = DefaultScreen(display);
+   GLXFBConfig *fbconfigs;
+   int i, nfbconfigs, value;
+   float top, bottom;
+
+   fbconfigs = glXGetFBConfigs(display, screen, &nfbconfigs);
+   for (i = 0; i < nfbconfigs; i++) {
+
+      glXGetFBConfigAttrib(display, fbconfigs[i], GLX_DRAWABLE_TYPE, &value);
+      if (!(value & GLX_PIXMAP_BIT))
+         continue;
+
+      glXGetFBConfigAttrib(display, fbconfigs[i],
+                           GLX_BIND_TO_TEXTURE_TARGETS_EXT, &value);
+      if (!(value & GLX_TEXTURE_2D_BIT_EXT))
+         continue;
+
+      glXGetFBConfigAttrib(display, fbconfigs[i],
+                           GLX_BIND_TO_TEXTURE_RGBA_EXT, &value);
+      if (value == False) {
+         glXGetFBConfigAttrib(display, fbconfigs[i],
+                              GLX_BIND_TO_TEXTURE_RGB_EXT, &value);
+         if (value == False)
+            continue;
+      }
+
+      glXGetFBConfigAttrib(display, fbconfigs[i],
+                           GLX_Y_INVERTED_EXT, &value);
+      if (value == True) {
+         top = 0.0f;
+         bottom = 1.0f;
+      }
+      else {
+         top = 1.0f;
+         bottom = 0.0f;
+      }
+
+      break;
+   }
+
+   if (i == nfbconfigs) {
+      printf("Unable to find FBconfig for texturing\n");
+      exit(1);
+   }
+
+   return fbconfigs[i];
+}
+
+
+static GLXPixmap
+CreatePixmap(Display *dpy, GLXFBConfig config, int w, int h, Pixmap *p)
+{
+   GLXPixmap gp;
+   const int pixmapAttribs[] = {
+      GLX_TEXTURE_TARGET_EXT, GLX_TEXTURE_2D_EXT,
+      GLX_TEXTURE_FORMAT_EXT, GLX_TEXTURE_FORMAT_RGB_EXT,
+      None
+   };
+   Window root = RootWindow(dpy, 0);
+
+   *p = XCreatePixmap(dpy, root, w, h, 24);
+   XSync(dpy, 0);
+   gp = glXCreatePixmap(dpy, config, *p, pixmapAttribs);
+   XSync(dpy, 0);
+
+   return gp;
+}
+
+
+static void
+DrawPixmapImage(Display *dpy, Pixmap pm, int w, int h)
+{
+   XGCValues gcvals;
+   GC gc;
+
+   gcvals.background = 0;
+   gc = XCreateGC(dpy, pm, GCBackground, &gcvals);
+
+   XSetForeground(dpy, gc, 0x0);
+   XFillRectangle(dpy, pm, gc, 0, 0, w, h);
+
+   XSetForeground(dpy, gc, 0xff0000);
+   XFillRectangle(dpy, pm, gc, 0, 0, 50, 50);
+
+   XSetForeground(dpy, gc, 0x00ff00);
+   XFillRectangle(dpy, pm, gc, w - 50, 0, 50, 50);
+
+   XSetForeground(dpy, gc, 0x0000ff);
+   XFillRectangle(dpy, pm, gc, 0, h - 50, 50, 50);
+
+   XSetForeground(dpy, gc, 0xffffff);
+   XFillRectangle(dpy, pm, gc, h - 50, h - 50, 50, 50);
+
+   XSetForeground(dpy, gc, 0xffff00);
+   XSetLineAttributes(dpy, gc, 3, LineSolid, CapButt, JoinBevel);
+   XDrawLine(dpy, pm, gc, 0, 0, w, h);
+   XDrawLine(dpy, pm, gc, 0, h, w, 0);
+
+   XFreeGC(dpy, gc);
+}
+
+
+static XVisualInfo *
+ChooseWindowVisual(Display *dpy)
+{
+   int screen = DefaultScreen(dpy);
+   XVisualInfo *visinfo;
+   int attribs[] = {
+      GLX_RGBA,
+      GLX_RED_SIZE, 1,
+      GLX_GREEN_SIZE, 1,
+      GLX_BLUE_SIZE, 1,
+      GLX_DOUBLEBUFFER,
+      None
+   };
+
+   visinfo = glXChooseVisual(dpy, screen, attribs);
+   if (!visinfo) {
+      printf("Unable to find RGB, double-buffered visual\n");
+      exit(1);
+   }
+
+   return visinfo;
+}
+
+
+static Window
+CreateWindow(Display *dpy, XVisualInfo *visinfo,
+             int width, int height, const char *name)
+{
+   int screen = DefaultScreen(dpy);
+   Window win;
+   XSetWindowAttributes attr;
+   unsigned long mask;
+   Window root;
+
+   root = RootWindow(dpy, screen);
+
+   /* window attributes */
+   attr.background_pixel = 0;
+   attr.border_pixel = 0;
+   attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
+   attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
+   mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
+
+   win = XCreateWindow(dpy, root, 0, 0, width, height,
+		        0, visinfo->depth, InputOutput,
+		        visinfo->visual, mask, &attr);
+   if (win) {
+      XSizeHints sizehints;
+      sizehints.width  = width;
+      sizehints.height = height;
+      sizehints.flags = USSize;
+      XSetNormalHints(dpy, win, &sizehints);
+      XSetStandardProperties(dpy, win, name, name,
+                              None, (char **)NULL, 0, &sizehints);
+
+      XMapWindow(dpy, win);
+   }
+   return win;
+}
+
+
+static void
+BindPixmapTexture(Display *dpy, GLXPixmap gp)
+{
+   GLuint texture;
+
+   glGenTextures(1, &texture);
+   glBindTexture(GL_TEXTURE_2D, texture);
+
+   glXBindTexImageEXT(dpy, gp, GLX_FRONT_LEFT_EXT, NULL);
+
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+   glEnable(GL_TEXTURE_2D);
+   /*
+     glXReleaseTexImageEXT (display, glxpixmap, GLX_FRONT_LEFT_EXT);
+   */
+}
+
+
+static void
+Resize(Window win, unsigned int width, unsigned int height)
+{
+   float sz = 1.5;
+   glViewport(0, 0, width, height);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glOrtho(-sz, sz, -sz, sz, -1.0, 1.0);
+   glMatrixMode(GL_MODELVIEW);
+}
+
+
+static void
+Redraw(Display *dpy, Window win, float rot)
+{
+   glClearColor(0.25, 0.25, 0.25, 0.0);
+   glClear(GL_COLOR_BUFFER_BIT);
+   glPushMatrix();
+   glRotatef(rot, 0, 0, 1);
+   glRotatef(2.0 * rot, 1, 0, 0);
+
+   glBegin(GL_QUADS);
+   glTexCoord2d(0.0, 0.0);
+   glVertex2f(-1, -1);
+   glTexCoord2d(1.0, 0.0);
+   glVertex2f( 1, -1);
+   glTexCoord2d(1.0, 1.0);
+   glVertex2d(1.0, 1.0);
+   glTexCoord2d(0.0, 1.0);
+   glVertex2f(-1.0, 1.0);
+   glEnd();
+
+   glPopMatrix();
+
+   glXSwapBuffers(dpy, win);
+}
+
+
+static void
+EventLoop(Display *dpy, Window win)
+{
+   GLfloat rot = 0.0;
+   int anim = 0;
+ 
+   while (1) {
+      if (!anim || XPending(dpy) > 0) {
+         XEvent event;
+         XNextEvent(dpy, &event);
+
+         switch (event.type) {
+         case Expose:
+            Redraw(dpy, win, rot);
+            break;
+         case ConfigureNotify:
+            Resize(event.xany.window,
+                   event.xconfigure.width,
+                   event.xconfigure.height);
+            break;
+         case KeyPress:
+            {
+               char buf[100];
+               KeySym keySym;
+               XComposeStatus stat;
+               XLookupString(&event.xkey, buf, sizeof(buf), &keySym, &stat);
+               if (keySym == XK_Escape) {
+                  return; /* exit */
+               }
+               else if (keySym == XK_r) {
+                  rot += 1.0;
+                  Redraw(dpy, win, rot);
+               }
+               else if (keySym == XK_a) {
+                  anim = !anim;
+               }
+               else if (keySym == XK_R) {
+                  rot -= 1.0;
+                  Redraw(dpy, win, rot);
+               }
+            }
+            break;
+         default:
+            ; /*no-op*/
+         }
+      }
+      else {
+         /* animate */
+         rot += 1.0;
+         Redraw(dpy, win, rot);
+      }
+   }
+}
+
+
+
+int
+main(int argc, char *argv[])
+{
+   Display *dpy;
+   GLXFBConfig pixmapConfig;
+   XVisualInfo *windowVis;
+   GLXPixmap gp;
+   Window win;
+   GLXContext ctx;
+   Pixmap p;
+
+   dpy = OpenDisplay();
+
+   pixmapConfig = ChoosePixmapFBConfig(dpy);
+   windowVis = ChooseWindowVisual(dpy);
+   win = CreateWindow(dpy, windowVis, 500, 500, "Texture From Pixmap");
+
+   gp = CreatePixmap(dpy, pixmapConfig, 512, 512, &p);
+   DrawPixmapImage(dpy, p, 512, 512);
+
+   ctx = glXCreateContext(dpy, windowVis, NULL, True);
+   if (!ctx) {
+      printf("Couldn't create GLX context\n");
+      exit(1);
+   }
+
+   glXMakeCurrent(dpy, win, ctx);
+
+   BindPixmapTexture(dpy, gp);
+
+   EventLoop(dpy, win);
+
+   return 0;
+}