pbuffer info and demo programs

1 files changed, 230 insertions, 0 deletions

diff --git a/progs/xdemos/pbutil.c b/progs/xdemos/pbutil.c
new file mode 100644
index 0000000000..4451a6d1a5
--- /dev/null
+++ b/progs/xdemos/pbutil.c
@@ -0,0 +1,230 @@
+/* $Id: pbutil.c,v 1.1 2002/10/05 18:30:13 brianp Exp $ */
+
+/*
+ * OpenGL pbuffers utility functions.
+ *
+ * Brian Paul
+ * April 1997
+ * Updated on 5 October 2002
+ */
+
+
+#include <stdio.h>
+#include <string.h>
+#include "pbutil.h"
+
+
+
+/*
+ * Test if we pixel buffers are available for a particular X screen.
+ * Input:  dpy - the X display
+ *         screen - screen number
+ * Return:  0 = pixel buffers not available.
+ *          1 = pixel buffers are available.
+ */
+int
+QueryPbuffers(Display *dpy, int screen)
+{
+#if defined(GLX_SGIX_fbconfig) && defined(GLX_SGIX_pbuffer)
+   char *extensions;
+
+   extensions = (char *) glXQueryServerString(dpy, screen, GLX_EXTENSIONS);
+   if (!strstr(extensions,"GLX_SGIX_fbconfig")) {
+      return 0;
+   }
+   if (!strstr(extensions,"GLX_SGIX_pbuffer")) {
+      return 0;
+   }
+   return 1;
+#else
+   return 0;
+#endif
+}
+
+
+
+#ifdef GLX_SGIX_fbconfig
+
+
+/*
+ * Print parameters for a GLXFBConfig to stdout.
+ * Input:  dpy - the X display
+ *         fbConfig - the fbconfig handle
+ *         horizFormat - if true, print in horizontal format
+ */
+void
+PrintFBConfigInfo(Display *dpy, GLXFBConfigSGIX fbConfig, Bool horizFormat)
+{
+   int pbAttribs[] = {GLX_LARGEST_PBUFFER_SGIX, True,
+		      GLX_PRESERVED_CONTENTS_SGIX, False,
+		      None};
+   GLXPbufferSGIX pBuffer;
+   int width=2, height=2;
+   int bufferSize, level, doubleBuffer, stereo, auxBuffers;
+   int redSize, greenSize, blueSize, alphaSize;
+   int depthSize, stencilSize;
+   int accumRedSize, accumBlueSize, accumGreenSize, accumAlphaSize;
+   int sampleBuffers, samples;
+   int drawableType, renderType, xRenderable, xVisual, id;
+   int maxWidth, maxHeight, maxPixels;
+   int optWidth, optHeight;
+
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_BUFFER_SIZE, &bufferSize);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_LEVEL, &level);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_DOUBLEBUFFER, &doubleBuffer);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_STEREO, &stereo);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_AUX_BUFFERS, &auxBuffers);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_RED_SIZE, &redSize);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_GREEN_SIZE, &greenSize);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_BLUE_SIZE, &blueSize);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_ALPHA_SIZE, &alphaSize);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_DEPTH_SIZE, &depthSize);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_STENCIL_SIZE, &stencilSize);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_ACCUM_RED_SIZE, &accumRedSize);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_ACCUM_GREEN_SIZE, &accumGreenSize);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_ACCUM_BLUE_SIZE, &accumBlueSize);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_ACCUM_ALPHA_SIZE, &accumAlphaSize);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_SAMPLE_BUFFERS_SGIS, &sampleBuffers);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_SAMPLES_SGIS, &samples);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_DRAWABLE_TYPE_SGIX, &drawableType);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_RENDER_TYPE_SGIX, &renderType);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_X_RENDERABLE_SGIX, &xRenderable);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_X_VISUAL_TYPE_EXT, &xVisual);
+   if (!xRenderable || !(drawableType & GLX_WINDOW_BIT_SGIX))
+      xVisual = -1;
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_FBCONFIG_ID_SGIX, &id);
+
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_MAX_PBUFFER_WIDTH_SGIX,
+			    &maxWidth);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_MAX_PBUFFER_HEIGHT_SGIX,
+			    &maxHeight);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_MAX_PBUFFER_PIXELS_SGIX,
+			    &maxPixels);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_OPTIMAL_PBUFFER_WIDTH_SGIX,
+			    &optWidth);
+   glXGetFBConfigAttribSGIX(dpy, fbConfig, GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX,
+			    &optHeight);
+
+   pBuffer = CreatePbuffer(dpy, fbConfig, width, height, pbAttribs);
+
+   if (horizFormat) {
+      printf("0x%03x ", id);
+      if (xVisual==GLX_STATIC_GRAY)        printf("StaticGray  ");
+      else if (xVisual==GLX_GRAY_SCALE)    printf("GrayScale   ");
+      else if (xVisual==GLX_STATIC_COLOR)  printf("StaticColor ");
+      else if (xVisual==GLX_PSEUDO_COLOR)  printf("PseudoColor ");
+      else if (xVisual==GLX_TRUE_COLOR)    printf("TrueColor   ");
+      else if (xVisual==GLX_DIRECT_COLOR)  printf("DirectColor ");
+      else                            printf("  -none-    ");
+      printf(" %3d %3d   %s   %s  %s   %2s   ", bufferSize, level,
+	     (renderType & GLX_RGBA_BIT_SGIX) ? "y" : "n",
+	     (renderType & GLX_COLOR_INDEX_BIT_SGIX) ? "y" : "n",
+	     doubleBuffer ? "y" : "n",
+	     stereo ? "y" : "n");
+      printf("%2d %2d %2d %2d  ", redSize, greenSize, blueSize, alphaSize);
+      printf("%2d %2d  ", depthSize, stencilSize);
+      printf("%2d %2d %2d %2d", accumRedSize, accumGreenSize, accumBlueSize,
+	     accumAlphaSize);
+      printf("    %2d    %2d", sampleBuffers, samples);
+      printf("       %s", pBuffer ? "y" : "n");
+      printf("\n");
+   }
+   else {
+      printf("Id 0x%x\n", id);
+      printf("  Buffer Size: %d\n", bufferSize);
+      printf("  Level: %d\n", level);
+      printf("  Double Buffer: %s\n", doubleBuffer ? "yes" : "no");
+      printf("  Stereo: %s\n", stereo ? "yes" : "no");
+      printf("  Aux Buffers: %d\n", auxBuffers);
+      printf("  Red Size: %d\n", redSize);
+      printf("  Green Size: %d\n", greenSize);
+      printf("  Blue Size: %d\n", blueSize);
+      printf("  Alpha Size: %d\n", alphaSize);
+      printf("  Depth Size: %d\n", depthSize);
+      printf("  Stencil Size: %d\n", stencilSize);
+      printf("  Accum Red Size: %d\n", accumRedSize);
+      printf("  Accum Green Size: %d\n", accumGreenSize);
+      printf("  Accum Blue Size: %d\n", accumBlueSize);
+      printf("  Accum Alpha Size: %d\n", accumAlphaSize);
+      printf("  Sample Buffers: %d\n", sampleBuffers);
+      printf("  Samples/Pixel: %d\n", samples);
+      printf("  Drawable Types: ");
+      if (drawableType & GLX_WINDOW_BIT_SGIX)  printf("Window ");
+      if (drawableType & GLX_PIXMAP_BIT_SGIX)  printf("Pixmap ");
+      if (drawableType & GLX_PBUFFER_BIT_SGIX)  printf("PBuffer");
+      printf("\n");
+      printf("  Render Types: ");
+      if (renderType & GLX_RGBA_BIT_SGIX)  printf("RGBA ");
+      if (renderType & GLX_COLOR_INDEX_BIT_SGIX)  printf("CI ");
+      printf("\n");
+      printf("  X Renderable: %s\n", xRenderable ? "yes" : "no");
+      /*
+      printf("  Max width: %d\n", maxWidth);
+      printf("  Max height: %d\n", maxHeight);
+      printf("  Max pixels: %d\n", maxPixels);
+      printf("  Optimum width: %d\n", optWidth);
+      printf("  Optimum height: %d\n", optHeight);
+      */
+      printf("  Pbuffer: %s\n", pBuffer ? "yes" : "no");
+   }
+
+   if (pBuffer) {
+      glXDestroyGLXPbufferSGIX(dpy, pBuffer);
+   }
+}
+
+
+
+/* This is only used by CreatePbuffer() */
+static int XErrorFlag = 0;
+static int HandleXError( Display *dpy, XErrorEvent *event )
+{
+    XErrorFlag = 1;
+    return 0;
+}
+
+
+/*
+ * Create a pixel buffer.  We loop over the list of fbconfigs trying to create
+ * a pixel buffer.  We return the first pixel buffer which we successfully
+ * create.  This function hides the ugliness of dealing with BadAlloc X
+ * protocol errors.
+ *
+ * Input:  dpy - the X display
+ *         fbConfig - an FBConfig as returned by glXChooseFBConfigSGIX().
+ *         width, height - size of pixel buffer to request, in pixels.
+ *         pbAttribs - list of pixel buffer attributes as used by
+ *                     glXCreateGLXPbufferSGIX().
+ * Return:  a pixel buffer or None.
+ */
+GLXPbufferSGIX
+CreatePbuffer( Display *dpy, GLXFBConfigSGIX fbConfig,
+	       int width, int height, int *pbAttribs )
+{
+   int (*oldHandler)( Display *, XErrorEvent * );
+   GLXPbufferSGIX pBuffer = None;
+
+   /* Catch X protocol errors with our own error handler */
+   oldHandler = XSetErrorHandler( HandleXError );
+
+   XErrorFlag = 0;
+   pBuffer = glXCreateGLXPbufferSGIX(dpy, fbConfig, width, height, pbAttribs);
+
+   /* Restore original X error handler */
+   (void) XSetErrorHandler( oldHandler );
+
+   /* Return pbuffer (may be None) */
+   if (!XErrorFlag && pBuffer!=None) {
+      /*printf("config %d worked!\n", i);*/
+      return pBuffer;
+   }
+   else {
+      return None;
+   }
+}
+
+
+
+#endif  /*GLX_SGIX_fbconfig*/
+
+