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/**
* Test glGetTexImage()
* Brian Paul
* 9 June 2009
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <GL/glew.h>
#include <GL/glut.h>
static int Win;
static void
TestGetTexImage(GLboolean npot)
{
GLuint iter;
GLubyte *data = (GLubyte *) malloc(1024 * 1024 * 4);
GLubyte *data2 = (GLubyte *) malloc(1024 * 1024 * 4);
glEnable(GL_TEXTURE_2D);
printf("glTexImage2D + glGetTexImage:\n");
for (iter = 0; iter < 8; iter++) {
GLint p = (iter % 8) + 3;
GLint w = npot ? (p * 20) : (1 << p);
GLint h = npot ? (p * 10) : (1 << p);
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("glTexImage + glGetTexImage failure!\n");
printf("Expected value %d, found %d\n", data[i], data2[i]);
abort();
}
}
/* get as BGRA */
glGetTexImage(GL_TEXTURE_2D, level, GL_BGRA, GL_UNSIGNED_BYTE, data2);
/* compare */
{
const GLubyte *rgba = (GLubyte *) data;
const GLubyte *bgra = (GLubyte *) data2;
for (i = 0; i < w * h; i += 4) {
if (rgba[i+0] != bgra[i+2] ||
rgba[i+1] != bgra[i+1] ||
rgba[i+2] != bgra[i+0] ||
rgba[i+3] != bgra[i+3]) {
printf("glTexImage + glGetTexImage(GL_BGRA) failure!\n");
printf("Expected value %d, found %d\n", data[i], data2[i]);
abort();
}
}
}
}
printf("Passed\n");
glDisable(GL_TEXTURE_2D);
free(data);
free(data2);
}
static GLboolean
ColorsEqual(const GLubyte ref[4], const GLubyte act[4])
{
if (abs((int) ref[0] - (int) act[0]) > 1 ||
abs((int) ref[1] - (int) act[1]) > 1 ||
abs((int) ref[2] - (int) act[2]) > 1 ||
abs((int) ref[3] - (int) act[3]) > 1) {
printf("expected %d %d %d %d\n", ref[0], ref[1], ref[2], ref[3]);
printf("found %d %d %d %d\n", act[0], act[1], act[2], act[3]);
return GL_FALSE;
}
return GL_TRUE;
}
static void
TestGetTexImageRTT(GLboolean npot)
{
GLuint iter;
printf("Render to texture + glGetTexImage:\n");
for (iter = 0; iter < 8; iter++) {
GLuint fb, tex;
GLint w, h;
GLint level = 0;
if (npot) {
w = 200 + iter * 40;
h = 200 + iter * 12;
}
else {
w = 4 << iter;
h = 4 << iter;
}
glGenTextures(1, &tex);
glGenFramebuffersEXT(1, &fb);
glBindTexture(GL_TEXTURE_2D, tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D, tex, level);
glViewport(0, 0, w, h);
printf(" Testing %d x %d tex image\n", w, h);
{
static const GLubyte blue[4] = {0, 0, 255, 255};
GLubyte color[4];
GLubyte *data2 = (GLubyte *) malloc(w * h * 4);
GLuint i;
/* random clear color */
for (i = 0; i < 4; i++) {
color[i] = rand() % 256;
}
glClearColor(color[0] / 255.0,
color[1] / 255.0,
color[2] / 255.0,
color[3] / 255.0);
glClear(GL_COLOR_BUFFER_BIT);
/* draw polygon over top half, in blue */
glColor4ubv(blue);
glRectf(0, 0.5, 1.0, 1.0);
/* get */
glGetTexImage(GL_TEXTURE_2D, level, GL_RGBA, GL_UNSIGNED_BYTE, data2);
/* compare */
for (i = 0; i < w * h; i += 4) {
if (i < w * h / 2) {
/* lower half */
if (!ColorsEqual(color, data2 + i * 4)) {
printf("Render to texture failure (expected clear color)!\n");
abort();
}
}
else {
/* upper half */
if (!ColorsEqual(blue, data2 + i * 4)) {
printf("Render to texture failure (expected blue)!\n");
abort();
}
}
}
free(data2);
}
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glDeleteFramebuffersEXT(1, &fb);
glDeleteTextures(1, &tex);
}
printf("Passed\n");
}
static void
Draw(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
TestGetTexImage(GL_FALSE);
if (glutExtensionSupported("GL_ARB_texture_non_power_of_two"))
TestGetTexImage(GL_TRUE);
if (glutExtensionSupported("GL_EXT_framebuffer_object") ||
glutExtensionSupported("GL_ARB_framebuffer_object")) {
TestGetTexImageRTT(GL_FALSE);
if (glutExtensionSupported("GL_ARB_texture_non_power_of_two"))
TestGetTexImageRTT(GL_TRUE);
}
glutDestroyWindow(Win);
exit(0);
glutSwapBuffers();
}
static void
Reshape(int width, int height)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, 1, 0, 1, -1, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0, 0.0, 0.0);
}
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)
{
}
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]);
glewInit();
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutDisplayFunc(Draw);
Init();
glutMainLoop();
return 0;
}
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