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/**
* @file getteximage-simple.c
*
* Extremely basic test to check whether image data can be retrieved.
*
* Note that the texture is used in a full frame of rendering before
* the readback, to ensure that buffer manager related code for uploading
* texture images is executed before the readback.
*
* This used to crash for R300+bufmgr.
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_MAIN(
100 /*window_width*/,
100 /*window_height*/,
GLUT_RGBA | GLUT_DOUBLE)
static GLubyte data[4096]; /* 64*16*4 */
static int test_getteximage(void)
{
GLubyte compare[4096];
int i;
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, compare);
for(i = 0; i < 4096; ++i) {
if (data[i] != compare[i]) {
printf("GetTexImage() returns incorrect data in byte %i\n", i);
printf(" corresponding to (%i,%i) channel %i\n", i / 64, (i / 4) % 16, i % 4);
printf(" expected: %i\n", data[i]);
printf(" got: %i\n", compare[i]);
return 0;
}
}
return 1;
}
enum piglit_result
piglit_display(void)
{
int pass;
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS);
glTexCoord2f(0, 0);
glVertex2f(0, 0);
glTexCoord2f(1, 0);
glVertex2f(1, 0);
glTexCoord2f(1, 1);
glVertex2f(1, 1);
glTexCoord2f(0, 1);
glVertex2f(0, 1);
glEnd();
glutSwapBuffers();
pass = test_getteximage();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
static void Reshape(int width, int height)
{
piglit_width = width;
piglit_height = height;
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0, 1.0, 0.0, 1.0, -2.0, 6.0);
glScalef(1.0, 1.0, -1.0); // flip z-axis
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void piglit_init(int argc, char **argv)
{
int i;
glutReshapeFunc(Reshape);
for(i = 0; i < 4096; ++i)
data[i] = rand() & 0xff;
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 64, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
Reshape(piglit_width, piglit_height);
}
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