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/**
* @file r300-readcache.c
*
* Test case for an odd problem in Radeon on-chip readcache.
*
* Basically, on some particular access patterns, the read cache misses the
* fact that the framebuffer has changed, and a glReadPixels returns stale
* data.
*
* The test works by repeatedly rendering a square in different colors,
* and testing after each run that a number of pixel locations return the
* right color.
*
* @note By the nature of the test, it makes no sense to have a demo mode,
* so this test is always automatic.
*/
#include "piglit-util.h"
#include "piglit-framework.h"
int piglit_width = 100, piglit_height = 100;
int piglit_window_mode = GLUT_DOUBLE | GLUT_RGBA;
static GLfloat colors[8][3] = {
{ 1.0, 1.0, 1.0 },
{ 1.0, 0.0, 0.0 },
{ 0.0, 1.0, 0.0 },
{ 0.0, 0.0, 1.0 },
{ 0.5, 0.0, 0.0 },
{ 0.0, 0.5, 0.0 },
{ 0.0, 0.0, 0.5 },
{ 0.0, 0.0, 0.0 }
};
enum piglit_result piglit_display(void)
{
int x, y, color, i, comp;
/* x and y range chosen to cover a wide range of memory;
* Actually, only the x coordinate should matter, but who knows... */
for(y = 0; y < 8; ++y) {
for(x = 0; x < 32; ++x) {
for(color = 0; color < 8; ++color) {
glColor3fv(colors[color]);
glBegin(GL_QUADS);
glVertex2f(-1, -1);
glVertex2f( 1, -1);
glVertex2f( 1, 1);
glVertex2f(-1, 1);
glEnd();
for(i = 0; i < 2; ++i) {
GLfloat result[3];
glReadPixels(x + (i ^ ((color/2)&1))*10, y,
1, 1, GL_RGB, GL_FLOAT, result);
for(comp = 0; comp < 3; ++comp) {
if (fabs(colors[color][comp] - result[comp]) > 0.01) {
printf("(x,y) = (%i,%i), color=%i, expected: %f %f %f got %f %f %f\n",
x, y, color,
colors[color][0], colors[color][1], colors[color][2],
result[0], result[1], result[2]);
return PIGLIT_FAILURE;
}
}
}
}
}
}
return PIGLIT_SUCCESS;
}
void piglit_init(int argc, char **argv)
{
(void) argc;
(void) argv;
piglit_automatic = GL_TRUE;
glViewport(0, 0, piglit_width, piglit_height);
}
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