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/*
* Copyright © 2013 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.
*/
/**
* Tests that sampler behavior works when texture units are not used
* contiguously starting from 0.
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = 400;
config.window_height = 100;
config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
extern float piglit_tolerance[4];
static int texrect_w;
static int texrect_h;
static const float r[] = {1, 0, 0, 1};
static const float g[] = {0, 1, 0, 1};
static const float b[] = {0, 0, 1, 1};
static const float w[] = {1, 1, 1, 1};
static float linear_tolerance[4];
static float nearest_tolerance[4];
static bool
test_nearest(int x)
{
int i;
/* Set default tolerance for nearest filtering. */
for (i = 0; i < 4; i++)
piglit_tolerance[i] = nearest_tolerance[i];
return (piglit_probe_rect_rgba(x, 0,
texrect_w, texrect_h, r) &&
piglit_probe_rect_rgba(x + texrect_w, 0,
texrect_w, texrect_h, g) &&
piglit_probe_rect_rgba(x, texrect_h,
texrect_w, texrect_h, b) &&
piglit_probe_rect_rgba(x + texrect_w, texrect_h,
texrect_w, texrect_h, w));
}
static bool
test_linear(int x)
{
float average[4];
int i;
/* For an even framebuffer size we don't sample exactly at the center
* of the texture. The centers of the texels are a quarter framebuffer
* (25 pixels) to the sides of the center of the framebuffer. We sample
* half a pixel off the center of the framebuffer. The lerp factors for
* the expected color are thus 0.5 +/- 0.5/25.
*/
const float offset = 1.0f/(float)texrect_w;
const float lfm = 0.5f - offset;
const float lfp = 0.5f + offset;
/* Increase tolerance a bit for linear filtering. */
for (i = 0; i < 4; i++)
piglit_tolerance[i] = linear_tolerance[i];
for (i = 0; i < 4; i++)
average[i] = (r[i] *lfm*lfm +
g[i] *lfm*lfp +
b[i] *lfp*lfm +
w[i] *lfp*lfp);
return (piglit_probe_pixel_rgba(x,
0,
r) &&
piglit_probe_pixel_rgba(x + texrect_w * 2 - 1,
0,
g) &&
piglit_probe_pixel_rgba(x,
texrect_h * 2 - 1,
b) &&
piglit_probe_pixel_rgba(x + texrect_w * 2 - 1,
texrect_h * 2 - 1,
w) &&
piglit_probe_pixel_rgba(x + texrect_w,
texrect_h, average));
}
enum piglit_result
piglit_display(void)
{
static const char *fp_source =
"!!ARBfp1.0\n"
"TEX result.color, fragment.texcoord[0], texture[1], 2D;\n"
"END\n";
bool pass = true;
GLuint tex;
GLuint prog;
texrect_w = piglit_width / 4 / 2;
texrect_h = piglit_height / 2;
glGenProgramsARB(1, &prog);
glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, prog);
glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB,
GL_PROGRAM_FORMAT_ASCII_ARB,
strlen(fp_source),
(const GLubyte *) fp_source);
glEnable(GL_FRAGMENT_PROGRAM_ARB);
glActiveTexture(GL_TEXTURE1);
tex = piglit_rgbw_texture(GL_RGBA, 2, 2, false, false,
GL_UNSIGNED_NORMALIZED);
/* Given that the failure mode we had that led to this test
* being written was that the sampler state read was
* pseudo-random, go through several statechanges on the
* sampler to make sure we're reliably getting our sampler
* state.
*/
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
piglit_draw_rect_tex(-1, -1, 0.5, 2,
0, 0, 1, 1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
piglit_draw_rect_tex(-0.5, -1, 0.5, 2,
0, 0, 1, 1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
piglit_draw_rect_tex(0, -1, 0.5, 2,
0, 0, 1, 1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
piglit_draw_rect_tex(0.5, -1, 0.5, 2,
0, 0, 1, 1);
pass = pass && test_nearest(piglit_width * 0 / 4);
pass = pass && test_linear(piglit_width * 1 / 4);
pass = pass && test_nearest(piglit_width * 2 / 4);
pass = pass && test_linear(piglit_width * 3 / 4);
piglit_present_results();
glDeleteTextures(1, &tex);
glDisable(GL_FRAGMENT_PROGRAM_ARB);
glDeleteProgramsARB(1, &prog);
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
int i;
piglit_require_extension("GL_ARB_fragment_program");
for (i = 0; i < 4; i++) {
nearest_tolerance[i] = piglit_tolerance[i];
linear_tolerance[i] = 0.02;
}
}
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