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/**
* Test glGetTexImage()
* Brian Paul
* 9 June 2009
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <GL/glut.h>
static int Win;
static void
TestGetTexImage(void)
{
GLuint iter;
for (iter = 0; iter < 20; iter++) {
GLint p = (iter % 6) + 4;
GLint w = (1 << p);
GLint h = (1 << p);
GLubyte data[512*512*4];
GLubyte data2[512*512*4];
GLuint i;
GLint level = 0;
printf("Testing %d x %d tex image\n", w, h);
/* fill data */
for (i = 0; i < w * h * 4; i++) {
data[i] = i & 0xff;
data2[i] = 0;
}
glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, w, h, 0,
GL_RGBA, GL_UNSIGNED_BYTE, data);
glBegin(GL_POINTS);
glVertex2f(0, 0);
glEnd();
/* get */
glGetTexImage(GL_TEXTURE_2D, level, GL_RGBA, GL_UNSIGNED_BYTE, data2);
/* compare */
for (i = 0; i < w * h * 4; i++) {
if (data2[i] != data[i]) {
printf("Failure!\n");
abort();
}
}
}
printf("Passed\n");
glutDestroyWindow(Win);
exit(0);
}
static void
Draw(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
TestGetTexImage();
glutSwapBuffers();
}
static void
Reshape(int width, int height)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0, 0.0, -15.0);
}
static void
Key(unsigned char key, int x, int y)
{
(void) x;
(void) y;
switch (key) {
case 27:
glutDestroyWindow(Win);
exit(0);
break;
}
glutPostRedisplay();
}
static void
Init(void)
{
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glEnable(GL_TEXTURE_2D);
}
int
main(int argc, char *argv[])
{
glutInit(&argc, argv);
glutInitWindowPosition(0, 0);
glutInitWindowSize(400, 400);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
Win = glutCreateWindow(argv[0]);
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutDisplayFunc(Draw);
Init();
glutMainLoop();
return 0;
}
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