initial check-in

1 files changed, 395 insertions, 0 deletions

diff --git a/progs/demos/texdown.c b/progs/demos/texdown.c
new file mode 100644
index 0000000000..a381f3b658
--- /dev/null
+++ b/progs/demos/texdown.c
@@ -0,0 +1,395 @@
+/* $Id: texdown.c,v 1.1 2000/01/28 16:25:44 brianp Exp $ */
+
+/*
+ * Copyright (C) 1999  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.
+ */
+
+
+/*
+ * texdown
+ *
+ * Measure texture download speed.
+ * Use keyboard to change texture size, format, datatype, scale/bias,
+ * subimageload, etc.
+ *
+ * Brian Paul  28 January 2000
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+
+static GLsizei MaxSize = 1024;
+static GLsizei TexWidth = 256, TexHeight = 256, TexBorder = 0;
+static GLenum TexFormat = GL_RGBA, TexType = GL_UNSIGNED_BYTE;
+static GLenum TexIntFormat = GL_RGBA;
+static GLboolean ScaleAndBias = GL_FALSE;
+static GLboolean SubImage = GL_FALSE;
+static GLdouble DownloadRate = 0.0;  /* texels/sec */
+
+static GLuint Mode = 0;
+
+
+static int
+BytesPerTexel(GLenum format, GLenum type)
+{
+   int b, c;
+
+   switch (type) {
+      case GL_UNSIGNED_BYTE:
+         b = 1;
+         break;
+      case GL_UNSIGNED_SHORT:
+         b = 2;
+         break;
+      default:
+         abort();
+   }
+
+   switch (format) {
+      case GL_RGB:
+         c = 3;
+         break;
+      case GL_RGBA:
+         c = 4;
+         break;
+      default:
+         abort();
+   }
+
+   return b * c;
+}
+
+
+static const char *
+FormatStr(GLenum format)
+{
+   switch (format) {
+      case GL_RGB:
+         return "GL_RGB";
+      case GL_RGBA:
+         return "GL_RGBA";
+      default:
+         return "";
+   }
+}
+
+
+static const char *
+TypeStr(GLenum type)
+{
+   switch (type) {
+      case GL_UNSIGNED_BYTE:
+         return "GLubyte";
+      case GL_UNSIGNED_SHORT:
+         return "GLushort";
+      default:
+         return "";
+   }
+}
+
+
+static void
+MeasureDownloadRate(void)
+{
+   const int w = TexWidth + 2 * TexBorder;
+   const int h = TexHeight + 2 * TexBorder;
+   const int bytes = w * h * BytesPerTexel(TexFormat, TexType);
+   GLubyte *texImage, *getImage;
+   GLdouble t0, t1, time;
+   int count;
+   int i;
+
+   texImage = (GLubyte *) malloc(bytes);
+   getImage = (GLubyte *) malloc(bytes);
+   if (!texImage || !getImage) {
+      DownloadRate = 0.0;
+      return;
+   }
+
+   for (i = 0; i < bytes; i++) {
+      texImage[i] = i & 0xff;
+   }
+
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+   glPixelStorei(GL_PACK_ALIGNMENT, 1);
+
+   if (ScaleAndBias) {
+      glPixelTransferf(GL_RED_SCALE, 0.5);
+      glPixelTransferf(GL_GREEN_SCALE, 0.5);
+      glPixelTransferf(GL_BLUE_SCALE, 0.5);
+      glPixelTransferf(GL_RED_BIAS, 0.5);
+      glPixelTransferf(GL_GREEN_BIAS, 0.5);
+      glPixelTransferf(GL_BLUE_BIAS, 0.5);
+   }
+   else {
+      glPixelTransferf(GL_RED_SCALE, 1.0);
+      glPixelTransferf(GL_GREEN_SCALE, 1.0);
+      glPixelTransferf(GL_BLUE_SCALE, 1.0);
+      glPixelTransferf(GL_RED_BIAS, 0.0);
+      glPixelTransferf(GL_GREEN_BIAS, 0.0);
+      glPixelTransferf(GL_BLUE_BIAS, 0.0);
+   }
+
+   count = 0;
+   t0 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
+   do {
+      if (SubImage && count > 0) {
+         glTexSubImage2D(GL_TEXTURE_2D, 0, -TexBorder, -TexBorder, w, h,
+                         TexFormat, TexType, texImage);
+      }
+      else {
+         glTexImage2D(GL_TEXTURE_2D, 0, TexIntFormat, w, h,
+                      TexBorder, TexFormat, TexType, texImage);
+      }
+
+      t1 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
+      time = t1 - t0;
+      count++;
+   } while (time < 3.0);
+
+   printf("w*h=%d  count=%d  time=%f\n", w*h, count, time);
+   DownloadRate = w * h * count / time;
+
+#if 0
+   if (!ScaleAndBias) {
+      /* verify texture readback */
+      glGetTexImage(GL_TEXTURE_2D, 0, TexFormat, TexType, getImage);
+      for (i = 0; i < w * h; i++) {
+         if (texImage[i] != getImage[i]) {
+            printf("[%d] %d != %d\n", i, texImage[i], getImage[i]);
+         }
+      }
+   }
+#endif
+
+   free(texImage);
+   free(getImage);
+
+   {
+      GLint err = glGetError();
+      if (err)
+         printf("GL error %d\n", err);
+   }
+}
+
+
+static void
+PrintString(const char *s)
+{
+   while (*s) {
+      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s);
+      s++;
+   }
+}
+
+
+static void
+Display(void)
+{
+   const int w = TexWidth + 2 * TexBorder;
+   const int h = TexHeight + 2 * TexBorder;
+   char s[1000];
+
+   glClear(GL_COLOR_BUFFER_BIT);
+
+   glRasterPos2i(10, 70);
+   sprintf(s, "Texture size[cursor]: %d x %d  Border[b]: %d", w, h, TexBorder);
+   PrintString(s);
+
+   glRasterPos2i(10, 55);
+   sprintf(s, "Texture format[f]: %s  Type[t]: %s  IntFormat[i]: %s",
+           FormatStr(TexFormat), TypeStr(TexType), FormatStr(TexIntFormat));
+   PrintString(s);
+
+   glRasterPos2i(10, 40);
+   sprintf(s, "Pixel Scale&Bias[p]: %s   TexSubImage[s]: %s",
+           ScaleAndBias ? "Yes" : "No",
+           SubImage ? "Yes" : "No");
+   PrintString(s);
+
+   if (Mode == 0) {
+      glRasterPos2i(200, 10);
+      sprintf(s, "...Measuring...");
+      PrintString(s);
+      glutSwapBuffers();
+      glutPostRedisplay();
+      Mode++;
+   }
+   else if (Mode == 1) {
+      MeasureDownloadRate();
+      glutPostRedisplay();
+      Mode++;
+   }
+   else {
+      /* show results */
+      glRasterPos2i(10, 10);
+      sprintf(s, "Download rate: %g Mtexels/second  %g MB/second",
+              DownloadRate / 1000000.0,
+              DownloadRate * BytesPerTexel(TexFormat, TexType) / 1000000.0);
+      PrintString(s);
+      glutSwapBuffers();
+   }
+}
+
+
+static void
+Reshape(int width, int height)
+{
+   glViewport( 0, 0, width, height );
+   glMatrixMode( GL_PROJECTION );
+   glLoadIdentity();
+   glOrtho(0, width, 0, height, -1, 1);
+   glMatrixMode( GL_MODELVIEW );
+   glLoadIdentity();
+}
+
+
+static GLenum
+NextFormat(GLenum format)
+{
+   if (format == GL_RGB) {
+      return GL_RGBA;
+   }
+   else if (format == GL_RGBA) {
+      return GL_RGB;
+   }
+   else {
+      return GL_RGBA;
+   }
+}
+
+
+static GLenum
+NextType(GLenum type)
+{
+   if (type == GL_UNSIGNED_BYTE) {
+      return GL_UNSIGNED_SHORT;
+   }
+   else if (type == GL_UNSIGNED_SHORT) {
+      return GL_UNSIGNED_BYTE;
+   }
+   else {
+      return GL_UNSIGNED_SHORT;
+   }
+}
+
+
+static void
+Key(unsigned char key, int x, int y)
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case ' ':
+         break;
+      case 'b':
+         /* toggle border */
+         TexBorder = 1 - TexBorder;
+         Mode = 0;
+         break;
+      case 'f':
+         /* change format */
+         TexFormat = NextFormat(TexFormat);
+         Mode = 0;
+         break;
+      case 'i':
+         /* change internal format */
+         TexIntFormat = NextFormat(TexIntFormat);
+         Mode = 0;
+         break;
+      case 'p':
+         /* toggle border */
+         ScaleAndBias = !ScaleAndBias;
+         Mode = 0;
+         break;
+      case 's':
+         SubImage = !SubImage;
+         Mode = 0;
+         break;
+      case 't':
+         /* change type */
+         TexType = NextType(TexType);
+         Mode = 0;
+         break;
+      case 27:
+         exit(0);
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void
+SpecialKey(int key, int x, int y)
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case GLUT_KEY_UP:
+         if (TexHeight < MaxSize)
+            TexHeight *= 2;
+         break;
+      case GLUT_KEY_DOWN:
+         if (TexHeight > 1)
+            TexHeight /= 2;
+         break;
+      case GLUT_KEY_LEFT:
+         if (TexWidth > 1)
+            TexWidth /= 2;
+         break;
+      case GLUT_KEY_RIGHT:
+         if (TexWidth < MaxSize)
+            TexWidth *= 2;
+         break;
+   }
+   Mode = 0;
+   glutPostRedisplay();
+}
+
+
+static void
+Init(void)
+{
+   printf("GL_VENDOR = %s\n", (const char *) glGetString(GL_VENDOR));
+   printf("GL_VERSION = %s\n", (const char *) glGetString(GL_VERSION));
+   printf("GL_RENDERER = %s\n", (const char *) glGetString(GL_RENDERER));
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   glutInit( &argc, argv );
+   glutInitWindowPosition( 0, 0 );
+   glutInitWindowSize( 600, 100 );
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
+   glutCreateWindow(argv[0]);
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutSpecialFunc( SpecialKey );
+   glutDisplayFunc( Display );
+   Init();
+   glutMainLoop();
+   return 0;
+}