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/*
* Copyright 2012 VMware, Inc.
*
* 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 (including the next
* paragraph) 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*/
/**
* Test glReadPixels(GL_DEPTH_COMPONENT)
* Brian Paul
* June 2012
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = 200;
config.window_height = 200;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_DEPTH;
PIGLIT_GL_TEST_CONFIG_END
/** Display contents of the depth buffer as grayscale color */
static void
display_depth(const GLfloat *buf)
{
glWindowPos2i(0, 0);
glDrawPixels(piglit_width, piglit_height,
GL_LUMINANCE, GL_FLOAT, buf);
}
/** Test glClear(GL_DEPTH_BUFFER_BIT) + glReadPixels */
static bool
test_z_clear(void)
{
GLfloat *buf = malloc(piglit_width * piglit_height * sizeof(GLfloat));
float z;
double diff, tolerance;
GLint zBits, i;
glGetIntegerv(GL_DEPTH_BITS, &zBits);
/* allow 1-bit error */
tolerance = 1.0 / (1 << (zBits - 1));
for (z = 0.0f; z <= 1.0f; z += 0.125) {
glClearDepth(z);
glClear(GL_DEPTH_BUFFER_BIT);
glReadPixels(0, 0, piglit_width, piglit_height,
GL_DEPTH_COMPONENT, GL_FLOAT, buf);
if (!piglit_automatic) {
display_depth(buf);
piglit_present_results();
}
/* Make sure all the values are the same */
for (i = 1; i < piglit_width * piglit_height; i++) {
if (buf[i] != buf[0]) {
printf("depth[%d]=%f != depth[0]=%f\n",
i, buf[i], buf[0]);
free(buf);
return false;
}
}
/* Check that the depth value read back is within tolerance */
diff = buf[0] - z;
if (diff > tolerance) {
printf("Depth buffer clear failed!\n");
printf("Expected %f, found %f\n", z, buf[0]);
free(buf);
return false;
}
}
free(buf);
return true;
}
static void
draw_z_gradient(GLfloat zLeft, GLfloat zRight)
{
GLfloat verts[4][3];
verts[0][0] = -1.0; verts[0][1] = -1.0; verts[0][2] = zLeft;
verts[1][0] = 1.0; verts[1][1] = -1.0; verts[1][2] = zRight;
verts[2][0] = 1.0; verts[2][1] = 1.0; verts[2][2] = zRight;
verts[3][0] = -1.0; verts[3][1] = 1.0; verts[3][2] = zLeft;
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, verts);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
}
static bool
test_z_gradient(void)
{
const GLfloat epsilon = 2.0 / piglit_width;
GLfloat *buf, *row;
bool pass = true;
int pos, i;
/* draw full-window quad with z increasing left to right */
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
draw_z_gradient(-1.0, 1.0);
glDisable(GL_DEPTH_TEST);
buf = (GLfloat *) malloc(piglit_width * piglit_height * sizeof(GLfloat));
/* read whole buffer */
glReadPixels(0, 0, piglit_width, piglit_height,
GL_DEPTH_COMPONENT, GL_FLOAT, buf);
/* examine a horizontal row at mid-Y */
row = buf + piglit_width * piglit_height / 2;
pos = 0;
if (fabs(row[pos] - 0.0) > epsilon) {
printf("Left-most Z value should be close to 0.0, found %f\n",
row[pos]);
pass = false;
}
pos = piglit_width / 2;
if (fabs(row[pos] - 0.5) > epsilon) {
printf("Middle Z value should be close to 0.5, found %f\n",
row[pos]);
pass = false;
}
pos = piglit_width - 1;
if (fabs(row[pos] - 1.0) > epsilon) {
printf("Left-most Z value should be close to 1.0, found %f\n",
row[pos]);
pass = false;
}
/* check for monotonicity */
for (i = 1; i < piglit_width; i++) {
if (row[i - 1] > row[i]) {
printf("Z values aren't increasing from left to right. row[%d]=%f > row[%d]=%f\n",
i-1, row[i-1], i, row[i]);
pass = false;
break;
}
}
if (!piglit_automatic) {
display_depth(buf);
piglit_present_results();
}
free(buf);
return pass;
}
enum piglit_result
piglit_display(void)
{
if (!test_z_clear())
return PIGLIT_FAIL;
if (!test_z_gradient())
return PIGLIT_FAIL;
return PIGLIT_PASS;
}
void
piglit_init(int argc, char **argv)
{
}
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