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/*
* Copyright © 2009 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.
*
* Author:
* Brian Paul
*
*/
/**
* @file glsl-arb-fragment-coord-conventions.c
*
* Test ARB_fragment_coord_conventions extension.
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.window_width = 100;
config.window_height = 100;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
static const float black[4] = {0.0, 0.0, 0.0, 0.0};
static const float red[4] = {1.0, 0.0, 0.0, 0.0};
static const float green[4] = {0.0, 1.0, 0.0, 0.0};
static const float yellow[4] = {1.0, 1.0, 0.0, 0.0};
static const float gray25[4] = {0.25, 0.25, 0.0, 0.0};
static const float gray75[4] = {0.75, 0.75, 0.0, 0.0};
static int test = 0;
/*
* For each of the various pixel center/origin layout qualifier modes
* draw a full-window quad where the fragment color is a function of
* the fragment coordinate.
*/
enum piglit_result
piglit_display(void)
{
GLuint prog;
GLuint vs, fs;
GLboolean pass = GL_TRUE;
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
vs = piglit_compile_shader(GL_VERTEX_SHADER, "shaders/glsl-mvp.vert");
/* No layout: test regular gl_FragCoord */
if (piglit_automatic || test == 0)
{
const char *fragtext =
"void main(void) \n"
"{ \n"
" gl_FragColor = gl_FragCoord * 0.01; \n"
"} \n";
printf("Regular gl_FragCoord\n");
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
prog = piglit_link_simple_program(vs, fs);
glUseProgram(prog);
glClear(GL_COLOR_BUFFER_BIT);
piglit_draw_rect(0, 0, piglit_width, piglit_height);
/* lower-left corner */
pass = piglit_probe_pixel_rgb(0, 0, black) && pass;
/* upper-right corner */
pass = piglit_probe_pixel_rgb(99, 99, yellow) && pass;
}
/* No layout, test pixel center is half integer */
if (piglit_automatic || test == 1)
{
const char *fragtext =
"#extension GL_ARB_fragment_coord_conventions: enable \n"
"void main(void) \n"
"{ \n"
" gl_FragColor = fract(gl_FragCoord) + 0.25; \n"
" gl_FragColor.z = 0.0; \n"
"} \n";
printf("Pixel center half integer\n");
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
prog = piglit_link_simple_program(vs, fs);
glUseProgram(prog);
glClear(GL_COLOR_BUFFER_BIT);
piglit_draw_rect(0, 0, piglit_width, piglit_height);
/* lower-left corner */
pass = piglit_probe_pixel_rgb(0, 0, gray75) && pass;
/* upper-right corner */
pass = piglit_probe_pixel_rgb(99, 99, gray75) && pass;
}
/* Pixel center integer */
if (piglit_automatic || test == 2)
{
const char *fragtext =
"#extension GL_ARB_fragment_coord_conventions: enable \n"
"layout(pixel_center_integer) varying vec4 gl_FragCoord; \n"
"void main(void) \n"
"{ \n"
" gl_FragColor = fract(gl_FragCoord) + 0.25; \n"
" gl_FragColor.z = 0.0; \n"
"} \n";
printf("Pixel center integer\n");
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
prog = piglit_link_simple_program(vs, fs);
glUseProgram(prog);
glClear(GL_COLOR_BUFFER_BIT);
piglit_draw_rect(0, 0, piglit_width, piglit_height);
/* lower-left corner */
pass = piglit_probe_pixel_rgb(0, 0, gray25) && pass;
/* upper-right corner */
pass = piglit_probe_pixel_rgb(99, 99, gray25) && pass;
}
/* Pixel origin upper left */
if (piglit_automatic || test == 3)
{
const char *fragtext =
"#extension GL_ARB_fragment_coord_conventions: enable \n"
"layout(origin_upper_left) varying vec4 gl_FragCoord; \n"
"void main(void) \n"
"{ \n"
" gl_FragColor = gl_FragCoord * 0.01; \n"
" gl_FragColor.z = 0.0; \n"
"} \n";
printf("Pixel origin upper left\n");
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
prog = piglit_link_simple_program(vs, fs);
glUseProgram(prog);
glClear(GL_COLOR_BUFFER_BIT);
piglit_draw_rect(0, 0, piglit_width, piglit_height);
/* lower-left corner */
pass = piglit_probe_pixel_rgb(0, 0, green) && pass;
/* upper-right corner */
pass = piglit_probe_pixel_rgb(99, 99, red) && pass;
}
/* Pixel origin upper left and pixel center integer */
if (piglit_automatic || test == 4)
{
static const float color1[4] = {0.125, 0.3725, 0.0, 0.0};
static const float color2[4] = {0.3725, 0.125, 0.0, 0.0};
const char *fragtext =
"#extension GL_ARB_fragment_coord_conventions: enable \n"
"layout(origin_upper_left, pixel_center_integer) varying vec4 gl_FragCoord; \n"
"void main(void) \n"
"{ \n"
" gl_FragColor = gl_FragCoord * 0.0025 + 0.125; \n"
" gl_FragColor.z = 0.0; \n"
"} \n";
printf("Pixel origin upper left and pixel center integer\n");
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
prog = piglit_link_simple_program(vs, fs);
glUseProgram(prog);
glClear(GL_COLOR_BUFFER_BIT);
piglit_draw_rect(0, 0, piglit_width, piglit_height);
/* lower-left corner */
pass = piglit_probe_pixel_rgb(0, 0, color1) && pass;
/* upper-right corner */
pass = piglit_probe_pixel_rgb(99, 99, color2) && pass;
}
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
static void key_func(unsigned char key, int x, int y)
{
switch (key) {
case 't':
test = (test + 1) % 5;
break;
}
piglit_escape_exit_key(key, x, y);
}
void piglit_init(int argc, char **argv)
{
piglit_require_gl_version(20);
piglit_require_extension("GL_ARB_fragment_coord_conventions");
if (!piglit_automatic) {
printf("Press t to switch between subtests.\n");
piglit_set_keyboard_func(key_func);
}
}
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