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Brian Paul
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998955f54f
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215ff22651
1 changed files with 395 additions and 0 deletions
395
progs/demos/texdown.c
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395
progs/demos/texdown.c
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/* $Id: texdown.c,v 1.1 2000/01/28 16:25:44 brianp Exp $ */
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/*
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* Copyright (C) 1999 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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* texdown
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*
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* Measure texture download speed.
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* Use keyboard to change texture size, format, datatype, scale/bias,
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* subimageload, etc.
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*
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* Brian Paul 28 January 2000
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <GL/glut.h>
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static GLsizei MaxSize = 1024;
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static GLsizei TexWidth = 256, TexHeight = 256, TexBorder = 0;
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static GLenum TexFormat = GL_RGBA, TexType = GL_UNSIGNED_BYTE;
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static GLenum TexIntFormat = GL_RGBA;
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static GLboolean ScaleAndBias = GL_FALSE;
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static GLboolean SubImage = GL_FALSE;
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static GLdouble DownloadRate = 0.0; /* texels/sec */
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static GLuint Mode = 0;
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static int
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BytesPerTexel(GLenum format, GLenum type)
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{
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int b, c;
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switch (type) {
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case GL_UNSIGNED_BYTE:
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b = 1;
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break;
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case GL_UNSIGNED_SHORT:
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b = 2;
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break;
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default:
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abort();
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}
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switch (format) {
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case GL_RGB:
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c = 3;
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break;
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case GL_RGBA:
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c = 4;
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break;
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default:
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abort();
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}
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return b * c;
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}
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static const char *
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FormatStr(GLenum format)
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{
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switch (format) {
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case GL_RGB:
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return "GL_RGB";
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case GL_RGBA:
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return "GL_RGBA";
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default:
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return "";
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}
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}
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static const char *
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TypeStr(GLenum type)
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{
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switch (type) {
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case GL_UNSIGNED_BYTE:
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return "GLubyte";
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case GL_UNSIGNED_SHORT:
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return "GLushort";
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default:
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return "";
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}
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}
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static void
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MeasureDownloadRate(void)
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{
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const int w = TexWidth + 2 * TexBorder;
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const int h = TexHeight + 2 * TexBorder;
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const int bytes = w * h * BytesPerTexel(TexFormat, TexType);
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GLubyte *texImage, *getImage;
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GLdouble t0, t1, time;
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int count;
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int i;
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texImage = (GLubyte *) malloc(bytes);
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getImage = (GLubyte *) malloc(bytes);
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if (!texImage || !getImage) {
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DownloadRate = 0.0;
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return;
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}
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for (i = 0; i < bytes; i++) {
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texImage[i] = i & 0xff;
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}
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glPixelStorei(GL_PACK_ALIGNMENT, 1);
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if (ScaleAndBias) {
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glPixelTransferf(GL_RED_SCALE, 0.5);
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glPixelTransferf(GL_GREEN_SCALE, 0.5);
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glPixelTransferf(GL_BLUE_SCALE, 0.5);
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glPixelTransferf(GL_RED_BIAS, 0.5);
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glPixelTransferf(GL_GREEN_BIAS, 0.5);
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glPixelTransferf(GL_BLUE_BIAS, 0.5);
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}
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else {
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glPixelTransferf(GL_RED_SCALE, 1.0);
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glPixelTransferf(GL_GREEN_SCALE, 1.0);
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glPixelTransferf(GL_BLUE_SCALE, 1.0);
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glPixelTransferf(GL_RED_BIAS, 0.0);
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glPixelTransferf(GL_GREEN_BIAS, 0.0);
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glPixelTransferf(GL_BLUE_BIAS, 0.0);
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}
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count = 0;
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t0 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
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do {
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if (SubImage && count > 0) {
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glTexSubImage2D(GL_TEXTURE_2D, 0, -TexBorder, -TexBorder, w, h,
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TexFormat, TexType, texImage);
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}
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else {
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glTexImage2D(GL_TEXTURE_2D, 0, TexIntFormat, w, h,
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TexBorder, TexFormat, TexType, texImage);
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}
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t1 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
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time = t1 - t0;
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count++;
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} while (time < 3.0);
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printf("w*h=%d count=%d time=%f\n", w*h, count, time);
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DownloadRate = w * h * count / time;
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#if 0
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if (!ScaleAndBias) {
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/* verify texture readback */
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glGetTexImage(GL_TEXTURE_2D, 0, TexFormat, TexType, getImage);
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for (i = 0; i < w * h; i++) {
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if (texImage[i] != getImage[i]) {
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printf("[%d] %d != %d\n", i, texImage[i], getImage[i]);
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}
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}
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}
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#endif
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free(texImage);
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free(getImage);
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{
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GLint err = glGetError();
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if (err)
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printf("GL error %d\n", err);
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}
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}
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static void
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PrintString(const char *s)
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{
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while (*s) {
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glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s);
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s++;
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}
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}
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static void
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Display(void)
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{
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const int w = TexWidth + 2 * TexBorder;
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const int h = TexHeight + 2 * TexBorder;
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char s[1000];
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glClear(GL_COLOR_BUFFER_BIT);
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glRasterPos2i(10, 70);
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sprintf(s, "Texture size[cursor]: %d x %d Border[b]: %d", w, h, TexBorder);
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PrintString(s);
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glRasterPos2i(10, 55);
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sprintf(s, "Texture format[f]: %s Type[t]: %s IntFormat[i]: %s",
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FormatStr(TexFormat), TypeStr(TexType), FormatStr(TexIntFormat));
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PrintString(s);
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glRasterPos2i(10, 40);
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sprintf(s, "Pixel Scale&Bias[p]: %s TexSubImage[s]: %s",
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ScaleAndBias ? "Yes" : "No",
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SubImage ? "Yes" : "No");
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PrintString(s);
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if (Mode == 0) {
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glRasterPos2i(200, 10);
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sprintf(s, "...Measuring...");
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PrintString(s);
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glutSwapBuffers();
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glutPostRedisplay();
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Mode++;
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}
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else if (Mode == 1) {
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MeasureDownloadRate();
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glutPostRedisplay();
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Mode++;
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}
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else {
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/* show results */
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glRasterPos2i(10, 10);
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sprintf(s, "Download rate: %g Mtexels/second %g MB/second",
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DownloadRate / 1000000.0,
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DownloadRate * BytesPerTexel(TexFormat, TexType) / 1000000.0);
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PrintString(s);
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glutSwapBuffers();
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}
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}
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static void
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Reshape(int width, int height)
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{
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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(0, width, 0, height, -1, 1);
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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}
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static GLenum
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NextFormat(GLenum format)
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{
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if (format == GL_RGB) {
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return GL_RGBA;
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}
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else if (format == GL_RGBA) {
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return GL_RGB;
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}
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else {
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return GL_RGBA;
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}
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}
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static GLenum
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NextType(GLenum type)
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{
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if (type == GL_UNSIGNED_BYTE) {
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return GL_UNSIGNED_SHORT;
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}
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else if (type == GL_UNSIGNED_SHORT) {
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return GL_UNSIGNED_BYTE;
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}
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else {
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return GL_UNSIGNED_SHORT;
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}
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}
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static void
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Key(unsigned char key, int x, int y)
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{
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(void) x;
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(void) y;
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switch (key) {
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case ' ':
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break;
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case 'b':
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/* toggle border */
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TexBorder = 1 - TexBorder;
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Mode = 0;
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break;
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case 'f':
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/* change format */
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TexFormat = NextFormat(TexFormat);
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Mode = 0;
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break;
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case 'i':
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/* change internal format */
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TexIntFormat = NextFormat(TexIntFormat);
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Mode = 0;
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break;
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case 'p':
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/* toggle border */
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ScaleAndBias = !ScaleAndBias;
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Mode = 0;
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break;
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case 's':
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SubImage = !SubImage;
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Mode = 0;
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break;
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case 't':
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/* change type */
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TexType = NextType(TexType);
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Mode = 0;
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break;
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case 27:
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exit(0);
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break;
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}
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glutPostRedisplay();
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}
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static void
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SpecialKey(int key, int x, int y)
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{
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(void) x;
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(void) y;
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switch (key) {
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case GLUT_KEY_UP:
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if (TexHeight < MaxSize)
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TexHeight *= 2;
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break;
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case GLUT_KEY_DOWN:
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if (TexHeight > 1)
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TexHeight /= 2;
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break;
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case GLUT_KEY_LEFT:
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if (TexWidth > 1)
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TexWidth /= 2;
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break;
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case GLUT_KEY_RIGHT:
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if (TexWidth < MaxSize)
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TexWidth *= 2;
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break;
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}
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Mode = 0;
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glutPostRedisplay();
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}
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static void
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Init(void)
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{
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printf("GL_VENDOR = %s\n", (const char *) glGetString(GL_VENDOR));
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printf("GL_VERSION = %s\n", (const char *) glGetString(GL_VERSION));
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printf("GL_RENDERER = %s\n", (const char *) glGetString(GL_RENDERER));
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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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glutInit( &argc, argv );
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glutInitWindowPosition( 0, 0 );
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glutInitWindowSize( 600, 100 );
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
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glutCreateWindow(argv[0]);
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glutReshapeFunc( Reshape );
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glutKeyboardFunc( Key );
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glutSpecialFunc( SpecialKey );
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glutDisplayFunc( Display );
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Init();
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glutMainLoop();
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return 0;
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}
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