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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-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
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
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);
}
enum piglit_result
piglit_display(void)
{
const GLfloat epsilon = 2.0 / piglit_width;
GLfloat *buf;
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);
buf = (GLfloat *) malloc(piglit_width * sizeof(GLfloat));
glReadPixels(0, piglit_height / 2, piglit_width, 1,
GL_DEPTH_COMPONENT, GL_FLOAT, buf);
pos = 0;
if (fabs(buf[pos] - 0.0) > epsilon) {
printf("Left-most Z value should be close to 0.0, found %f\n",
buf[pos]);
pass = false;
}
pos = piglit_width / 2;
if (fabs(buf[pos] - 0.5) > epsilon) {
printf("Middle Z value should be close to 0.5, found %f\n",
buf[pos]);
pass = false;
}
pos = piglit_width - 1;
if (fabs(buf[pos] - 1.0) > epsilon) {
printf("Left-most Z value should be close to 1.0, found %f\n",
buf[pos]);
pass = false;
}
/* check for monotonicity */
for (i = 1; i < piglit_width; i++) {
if (buf[i - 1] > buf[i]) {
printf("Z values aren't increasing from left to right. buf[%d]=%f > buf[%d]=%f\n",
i-1, buf[i-1], i, buf[i]);
pass = false;
break;
}
}
free(buf);
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
}
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