/* $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;
}