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-rw-r--r--progs/demos/texdown.c395
1 files changed, 395 insertions, 0 deletions
diff --git a/progs/demos/texdown.c b/progs/demos/texdown.c
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+++ b/progs/demos/texdown.c
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+/* $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;
+}
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