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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.
*/
/** \file builtin-gl-sample-position.cpp
* This test verifies that using gl_SamplePosition in fragment shader
* program works as per ARB_sample_shading specification.
*
* Note that we do not have to enable GL_SAMPLE_SHADING_ARB.
* The GL_ARB_sample_shading spec (and the GLSL 4.0 spec) say:
*
* 9) Is per-sample shading ever triggered by properties of the fragment
* shader?
*
* RESOLVED: Yes. The variables "gl_SampleID" and "gl_SamplePosition"
* can be used to read properties of the current sample, which wouldn't
* make much sense if the fragment shader were run at a lower frequency
* than per-sample.
*
**/
#include "piglit-fbo.h"
#define MAX_NUM_SAMPLES 32
#define MAX_NUM_SAMPLES_STR "32"
using namespace piglit_util_fbo;
const int pattern_width = 128; const int pattern_height = 128;
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 21;
config.supports_gl_core_version = 31;
config.window_width = pattern_width;
config.window_height = pattern_height;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
config.khr_no_error_support = PIGLIT_NO_ERRORS;
PIGLIT_GL_TEST_CONFIG_END
static int num_samples;
static unsigned prog;
static Fbo multisampled_fbo;
static void
print_usage_and_exit(char *prog_name)
{
printf("Usage: %s <num_samples>\n", prog_name);
piglit_report_result(PIGLIT_FAIL);
}
void
compile_shader(void)
{
static const char *vert =
"#version 130\n"
"in vec4 piglit_vertex;\n"
"void main()\n"
"{\n"
" gl_Position = piglit_vertex;\n"
"}\n";
static const char *frag =
"#version 130\n"
"#extension GL_ARB_sample_shading : enable\n"
"uniform int samples;\n"
"uniform vec2 expected_pos[" MAX_NUM_SAMPLES_STR "];\n"
"out vec4 out_color;\n"
"void main()\n"
"{\n"
" if ((expected_pos[gl_SampleID] == gl_SamplePosition) ||\n"
" (samples == 0 && gl_SamplePosition == vec2(0.5, 0.5)))\n"
" out_color = vec4(0.0, 1.0, 0.0, 1.0);\n"
" else\n"
" out_color = vec4(1.0, 0.0, 0.0, 1.0);\n"
"}\n";
/* Compile program */
prog = piglit_build_simple_program(vert, frag);
if (!piglit_link_check_status(prog)) {
piglit_report_result(PIGLIT_FAIL);
}
}
void
piglit_init(int argc, char **argv)
{
if (argc != 2)
print_usage_and_exit(argv[0]);
/* 1st arg: num_samples */
char *endptr = NULL;
num_samples = strtol(argv[1], &endptr, 0);
if (endptr != argv[1] + strlen(argv[1]))
print_usage_and_exit(argv[0]);
piglit_require_extension("GL_ARB_vertex_array_object");
piglit_require_extension("GL_ARB_sample_shading");
piglit_require_GLSL_version(130);
/* Skip the test if num_samples > GL_MAX_SAMPLES */
GLint max_samples;
glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
if (num_samples > max_samples)
piglit_report_result(PIGLIT_SKIP);
if (num_samples > MAX_NUM_SAMPLES)
piglit_report_result(PIGLIT_FAIL);
FboConfig msConfig(num_samples, pattern_width, pattern_height);
multisampled_fbo.setup(msConfig);
compile_shader();
if (!piglit_check_gl_error(GL_NO_ERROR)) {
piglit_report_result(PIGLIT_FAIL);
}
}
enum piglit_result
piglit_display()
{
GLint samples;
GLfloat sample_pos[MAX_NUM_SAMPLES * 2];
GLfloat expected[4] = {0.0, 1.0, 0.0, 1.0};
bool pass = true;
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_fbo.handle);
glClear(GL_COLOR_BUFFER_BIT);
glGetIntegerv(GL_SAMPLES, &samples);
for(int i = 0; i < samples; i++) {
glGetMultisamplefv(GL_SAMPLE_POSITION, i, &(sample_pos[2 * i]));
printf("sample[%d]_pos = {%f, %f}\n",
i, sample_pos[2 * i], sample_pos[2 * i + 1]);
}
glUseProgram(prog);
glUniform1i(glGetUniformLocation(prog, "samples"), samples);
glUniform2fv(glGetUniformLocation(prog, "expected_pos"),
MAX_NUM_SAMPLES, sample_pos);
piglit_draw_rect(-1, -1, 2, 2);
glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
glClear(GL_COLOR_BUFFER_BIT);
glBlitFramebuffer(0, 0,
pattern_width, pattern_height,
0, 0,
pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT,
GL_NEAREST);
glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
pass = piglit_probe_rect_rgba(0, 0, pattern_width,
pattern_width, expected)
&& pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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