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/*
* Copyright © 2013 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.
*
* Authors:
* Roland Scheidegger <sroland@vmware.com>
*
* Tests accuracy of srgb->linear and linear->srgb conversion,
* according to d3d10 rules:
* 1) srgb->linear is permitted a tolerance of 0.5 on the srgb side
* (meaning the result converted back to srgb (but before float->int
* conversion) using perfect formula must not deviate more than 0.5)
* 2) linear->srgb is permitted a tolerance of 0.6 compared to using
* perfect formula
* 3) additionally all srgb values must stay the same when doing
* srgb to linear and then linear to srgb conversion.
* This test does not actually verify 2) (which would need exhaustive
* test of all float values) so if some floats outside these generated
* by srgb->linear conversion get mapped to arbitrary values that will
* go unnoticed. Likewise, correct behavior for floats outside 0.0-1.0
* is not verified (including INFs and NaNs - the former should get clamped
* to 0/255 in the end, NaNs should also get mapped to 0).
*
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = 16;
config.window_height = 16;
config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
static enum piglit_result test_format(void)
{
GLboolean pass = GL_TRUE;
GLuint texsrgb, texfb, fb;
GLenum status;
int i;
float tex_vals[256][4];
float readf[256][4];
float tolerance;
GLubyte readb[256][4];
float maxErr = 0.0f;
for (i = 0; i < 256; i++) {
tex_vals[i][0] = (float)i / 255.0f;
tex_vals[i][1] = tex_vals[i][2] = 0.0f;
tex_vals[i][3] = 1.0f;
}
/* initialize texture */
glGenTextures(1, &texsrgb);
glBindTexture(GL_TEXTURE_2D, texsrgb);
glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8_EXT,
16, 16, 0,
GL_RGBA, GL_FLOAT, &tex_vals[0][0]);
glGenFramebuffersEXT(1, &fb);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
glViewport(0, 0, piglit_width, piglit_height);
/* draw into float framebuffer and verify results */
glGenTextures(1, &texfb);
glBindTexture(GL_TEXTURE_2D, texfb);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F_ARB,
piglit_width, piglit_height, 0,
GL_RGBA, GL_FLOAT, NULL);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D,
texfb,
0);
assert(glGetError() == 0);
status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
printf("Testing using fb float format");
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
printf(" - fbo incomplete (status = %s)\n",
piglit_get_gl_enum_name(status));
piglit_report_subtest_result(PIGLIT_SKIP, "float fb");
return PIGLIT_SKIP;
}
printf("\n");
glColor4f(1, 1, 1, 1);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texsrgb);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_REPLACE);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_REPLACE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
piglit_draw_rect_tex(-1, -1, 2, 2,
0, 0, 1, 1);
glDisable(GL_TEXTURE_2D);
/* have to make up our own error measuring, since we
measure error on srgb side (so with values mapped back to srgb
using accurate formula) */
tolerance = 0.5f; /* as required by d3d10 */
glReadPixels(0, 0, 16, 16, GL_RGBA, GL_FLOAT, &readf[0][0]);
for (i = 0; i < 256; i++) {
float err = fabs(piglit_linear_to_srgb(readf[i][0]) - (float)i);
if (0)
printf("readback: %f observed: %f expected: %f\n", readf[i][0],
piglit_linear_to_srgb(readf[i][0]), (float)i);
if (err > maxErr) {
maxErr = err;
}
if (err > tolerance) {
printf(" failed when testing srgb->float result\n");
pass = GL_FALSE;
break;
}
}
printf("max error srgb->linear was %f\n", maxErr);
piglit_present_results();
piglit_report_subtest_result(pass ? PIGLIT_PASS : PIGLIT_FAIL,
"srgb->linear");
/* draw into srgb framebuffer and verify results */
glBindTexture(GL_TEXTURE_2D, texfb);
glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8_EXT,
piglit_width, piglit_height, 0,
GL_RGBA, GL_FLOAT, NULL);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D,
texfb,
0);
assert(glGetError() == 0);
glEnable(GL_FRAMEBUFFER_SRGB_EXT);
status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
printf("Testing using fb srgb format");
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
printf(" - fbo incomplete (status = %s)\n",
piglit_get_gl_enum_name(status));
piglit_report_subtest_result(PIGLIT_SKIP, "srgb fb");
return PIGLIT_SKIP;
}
printf("\n");
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texsrgb);
piglit_draw_rect_tex(-1, -1, 2, 2,
0, 0, 1, 1);
glDisable(GL_TEXTURE_2D);
tolerance = 0.6f; /* as required by d3d10 */
/* TODO: should test this tolerance too really right now only test
the previously converted from srgb values, so we only enforce
any value stays the same when doing srgb->linear->srgb, which
corresponds to 0.5 tolerance but only for these exact values. */
glReadPixels(0, 0, 16, 16, GL_RGBA, GL_UNSIGNED_BYTE, &readb[0][0]);
for (i = 0; i < 256; i++) {
if (0)
printf("observed: %d expected: %d\n", readb[i][0], i);
if (readb[i][0] != i) {
printf(" failed when testing srgb->float->srgb result\n");
pass = GL_FALSE;
break;
}
}
piglit_present_results();
piglit_report_subtest_result(pass ? PIGLIT_PASS : PIGLIT_FAIL,
"srgb->linear->srgb");
glDeleteTextures(1, &texfb);
glDeleteTextures(1, &texsrgb);
glDeleteFramebuffersEXT(1, &fb);
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
enum piglit_result piglit_display(void)
{
return test_format();
}
void piglit_init(int argc, char **argv)
{
piglit_require_extension("GL_EXT_framebuffer_object");
piglit_require_extension("GL_ARB_texture_env_combine");
piglit_require_extension("GL_EXT_texture_sRGB");
piglit_require_extension("GL_ARB_framebuffer_sRGB");
piglit_require_extension("GL_ARB_color_buffer_float");
glDisable(GL_DITHER);
}
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