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/*
* Copyright © 2011 Intel Corporation
*
* 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.
*/
/** @file fbo-readpixels-depth-formats.c
*
* Tests that various formats of depth renderbuffers can be read
* correctly using glReadPixels() with various format/type
* combinations.
*/
#include "piglit-util.h"
#define BUF_WIDTH 15
#define BUF_HEIGHT 15
PIGLIT_GL_TEST_MAIN(
BUF_WIDTH /*window_width*/,
BUF_WIDTH /*window_height*/,
GLUT_DOUBLE | GLUT_RGB | GLUT_ALPHA)
/* Width of our stripes of z = 0.0, 0.5, 1.0 */
static int w = BUF_WIDTH / 3;
int depth_bits;
static bool
test_pixel(int x, int y, uint32_t value)
{
uint32_t expected;
if (x < w)
expected = 0x00000000;
else if (x < w * 2)
expected = 0x80000001;
else
expected = 0xffffff02;
/* Compare depth and stencil separately. Use 1-bit tolerance for depth. */
if ((value & 0xff) - (expected & 0xff) != 0 ||
abs((value >> 8) - (expected >> 8)) > 1) {
fprintf(stderr,
"Expected 0x%08x at (%d,%d), found 0x%08x\n",
expected, x, y, value);
return false;
}
return true;
}
static bool
test()
{
GLuint tex, fb;
GLenum status;
bool pass = true;
uint32_t values[BUF_WIDTH * BUF_HEIGHT];
int x, y;
glGenFramebuffersEXT(1, &fb);
glBindFramebufferEXT(GL_FRAMEBUFFER, fb);
assert(glGetError() == 0);
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH24_STENCIL8,
BUF_WIDTH, BUF_HEIGHT, 0,
GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
GL_DEPTH_ATTACHMENT_EXT,
GL_TEXTURE_2D,
tex,
0);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
GL_STENCIL_ATTACHMENT_EXT,
GL_TEXTURE_2D,
tex,
0);
glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);
status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER);
if (status != GL_FRAMEBUFFER_COMPLETE) {
fprintf(stderr, "framebuffer incomplete\n");
goto done;
}
glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_ALWAYS);
glEnable(GL_STENCIL_TEST);
glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
glViewport(0, 0, BUF_WIDTH, BUF_HEIGHT);
piglit_ortho_projection(BUF_WIDTH, BUF_HEIGHT, false);
glStencilFunc(GL_ALWAYS, 0, ~0);
piglit_draw_rect_z(1.0, 0, 0, w, BUF_HEIGHT);
glStencilFunc(GL_ALWAYS, 1, ~0);
piglit_draw_rect_z(0.0, w, 0, w * 2, BUF_HEIGHT);
glStencilFunc(GL_ALWAYS, 2, ~0);
piglit_draw_rect_z(-1.0, w * 2, 0, w * 3, BUF_HEIGHT);
glReadPixels(0, 0, BUF_WIDTH, BUF_HEIGHT,
GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8, values);
for (y = 0; y < BUF_HEIGHT; y++) {
for (x = 0; x < BUF_WIDTH; x++) {
if (!test_pixel(x, y, values[y * BUF_WIDTH + x])) {
pass = false;
break;
}
}
if (x != BUF_WIDTH)
break;
}
done:
glDeleteFramebuffersEXT(1, &fb);
glDeleteTextures(1, &tex);
return pass;
}
void piglit_init(int argc, char **argv)
{
bool pass = true;
piglit_require_extension("GL_EXT_framebuffer_object");
piglit_require_extension("GL_EXT_packed_depth_stencil");
pass = test();
piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
enum piglit_result
piglit_display(void)
{
/* UNREACHED */
return PIGLIT_FAIL;
}
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