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/*
* Copyright © 2014 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.
*/
/**
* \file getteximage.c
*
* Test glGetTexImage with packed depth/stencil formats.
*
* This exercises a bug in Mesa where we failed to do proper texel
* conversion for depth/stencil values in glGetTexImage. But, the bug
* would only appear depending on whether the driver stores depth/stencil
* textures as z24s8 versus s8z24.
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 12;
config.window_visual = PIGLIT_GL_VISUAL_RGBA;
PIGLIT_GL_TEST_CONFIG_END
#define WIDTH 16
#define HEIGHT 16
static bool
test_z24_s8(void)
{
GLuint tex[WIDTH * HEIGHT];
GLuint buf[WIDTH * HEIGHT];
GLuint i;
/* init tex data */
for (i = 0; i < WIDTH * HEIGHT; i++) {
GLuint s = 255 - (i & 255);
GLuint z = i * 100;
tex[i] = (z << 24) | s;
}
/* create texture */
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH24_STENCIL8,
WIDTH, HEIGHT, 0,
GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8, tex);
if (!piglit_check_gl_error(GL_NO_ERROR))
return false;
/* read back the texture */
glGetTexImage(GL_TEXTURE_2D, 0,
GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8, buf);
if (!piglit_check_gl_error(GL_NO_ERROR))
return false;
/* compare */
for (i = 0; i < WIDTH * HEIGHT; i++) {
if (buf[i] != tex[i]) {
printf("Wrong texel data at position %d: "
"Expected 0x%08x, found 0x%08x\n",
i, tex[i], buf[i]);
return false;
}
}
return true;
}
static bool
test_z32_s8(void)
{
const double epsilon = 2.0 / (float) 0xffffff; /* 2-bit error */
GLuint tex[2 * WIDTH * HEIGHT];
GLuint buf[2 * WIDTH * HEIGHT];
GLuint i;
GLfloat *ftex = (GLfloat *) tex;
GLfloat *fbuf = (GLfloat *) buf;
/* init tex data */
for (i = 0; i < WIDTH * HEIGHT; i++) {
GLuint s = 255 - (i & 255);
GLfloat z = (float) i / (float) (WIDTH * HEIGHT - 1);
ftex[i*2+0] = z;
tex[i*2+1] = s;
}
/* create texture */
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH32F_STENCIL8,
WIDTH, HEIGHT, 0,
GL_DEPTH_STENCIL,
GL_FLOAT_32_UNSIGNED_INT_24_8_REV, tex);
if (!piglit_check_gl_error(GL_NO_ERROR))
return false;
/* read back the texture as float32/stencil8 */
glGetTexImage(GL_TEXTURE_2D, 0,
GL_DEPTH_STENCIL,
GL_FLOAT_32_UNSIGNED_INT_24_8_REV, buf);
if (!piglit_check_gl_error(GL_NO_ERROR))
return false;
/* compare */
for (i = 0; i < WIDTH * HEIGHT; i++) {
if (fbuf[i*2+0] != ftex[i*2+0]) {
printf("Wrong depth data at position %d: "
"Expected %g, found %g\n",
i, ftex[i*2+0], fbuf[i*2+0]);
return false;
}
if (buf[i*2+1] != tex[i*2+1]) {
printf("Wrong stencil data at position %d: "
"Expected 0x%08x, found 0x%08x\n",
i, tex[i*2+1], buf[i*2+1]);
return false;
}
}
/* read back the texture as depth24/stencil8 */
glGetTexImage(GL_TEXTURE_2D, 0,
GL_DEPTH_STENCIL,
GL_UNSIGNED_INT_24_8, buf);
if (!piglit_check_gl_error(GL_NO_ERROR))
return false;
/* compare */
for (i = 0; i < WIDTH * HEIGHT; i++) {
GLuint s = buf[i] & 0xff;
GLfloat z = (buf[i] >> 8) / (float) 0xffffff;
if (fabs(z - ftex[i*2+0]) > epsilon) {
printf("Wrong depth data at position %d: "
"Expected %g, found %g\n",
i, ftex[i*2+0], z);
return false;
}
if (s != tex[i*2+1]) {
printf("Wrong stencil data at position %d: "
"Expected 0x%02x, found 0x%02x\n",
i, tex[i*2+1], s);
return false;
}
}
return true;
}
void
piglit_init(int argc, char **argv)
{
bool pass;
/* We can create depth/stencil textures if either:
* 1. We have GL 3.0 or later
* 2. We have GL_EXT_packed_depth_stencil and GL_ARB_depth_texture
*/
if (piglit_get_gl_version() < 30
&& !(piglit_is_extension_supported("GL_EXT_packed_depth_stencil") &&
piglit_is_extension_supported("GL_ARB_depth_texture"))) {
printf("OpenGL 3.0 or GL_EXT_packed_depth_stencil + "
"GL_ARB_depth_texture is required.\n");
piglit_report_result(PIGLIT_SKIP);
}
pass = test_z24_s8();
if (piglit_get_gl_version() >= 30 ||
piglit_is_extension_supported("GL_ARB_depth_buffer_float")) {
pass = test_z32_s8() && pass;
}
piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
enum piglit_result
piglit_display(void)
{
/* unused */
return PIGLIT_FAIL;
}
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