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/*
* Copyright © 2013 Intel Corporation
* Copyright © 2014 Advanced Micro Devices, 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 builtin-gl-sample-mask-simple.cpp
* This test verifies that supplying a value to gl_SampleMask[]
* in fragment shader program works as per ARB_sample_shading
* specification.
**/
#include "piglit-fbo.h"
using namespace piglit_util_fbo;
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 21;
config.supports_gl_core_version = 31;
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_0, prog_1;
static Fbo multisampled_tex;
static void
print_usage_and_exit(char *prog_name)
{
printf("Usage: %s <num_samples>\n", prog_name);
piglit_report_result(PIGLIT_FAIL);
}
static 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_0 =
"#version 130\n"
"#extension GL_ARB_sample_shading : enable\n"
"out vec4 out_color;\n"
"void main()\n"
"{\n"
" gl_SampleMask[0] = int(gl_FragCoord.x);\n"
" out_color = vec4(1.0, 0.0, 0.0, 0.0);\n"
"}\n";
static const char *frag_template =
"#version 130 \n"
"%s \n"
"uniform %s tex; \n"
"#define fetch(i) (texelFetch(tex, ivec2(int(gl_FragCoord.y/8) * 16 + int(gl_FragCoord.x/8) % 16, 0)%s)) \n"
"uniform int samples; \n"
"out vec4 out_color; \n"
"void main() \n"
"{ \n"
" vec4 outv = vec4(0.0, 0.0, 0.0, 0.0); \n"
/* encode the sample mask to RGBA */
" outv.x += fetch(0).x * 0.6; \n"
" if (1 < samples) outv.y += fetch(1).x * 0.6; \n"
" if (2 < samples) outv.z += fetch(2).x * 0.6; \n"
" if (3 < samples) outv.w += fetch(3).x * 0.6; \n"
" if (4 < samples) outv.x += fetch(4).x * 0.4; \n"
" if (5 < samples) outv.y += fetch(5).x * 0.4; \n"
" if (6 < samples) outv.z += fetch(6).x * 0.4; \n"
" if (7 < samples) outv.w += fetch(7).x * 0.4; \n"
" out_color = outv;\n"
"} \n";
/* Compile program */
prog_0 = piglit_build_simple_program(vert, frag_0);
if (!piglit_link_check_status(prog_0)) {
piglit_report_result(PIGLIT_FAIL);
}
char *frag_1;
if (num_samples)
(void)!asprintf(&frag_1, frag_template,
"#extension GL_ARB_texture_multisample : require",
"sampler2DMS", ", i");
else
(void)!asprintf(&frag_1, frag_template, "", "sampler2DRect", "");
prog_1 = piglit_build_simple_program(vert, frag_1);
if (!piglit_link_check_status(prog_1)) {
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]);
if (num_samples > 8) {
puts("This test only supports 8 samples.");
piglit_report_result(PIGLIT_SKIP);
}
piglit_require_extension("GL_ARB_texture_multisample");
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);
FboConfig msConfig(num_samples, 1 << MAX2(num_samples, 1), 1);
msConfig.num_rb_attachments = 0;
msConfig.num_tex_attachments = 1;
multisampled_tex.setup(msConfig);
compile_shader();
if (!piglit_check_gl_error(GL_NO_ERROR)) {
piglit_report_result(PIGLIT_FAIL);
}
}
static bool
equal(float a, float b)
{
return fabs(a - b) < piglit_tolerance[0];
}
enum piglit_result
piglit_display()
{
bool pass = true;
int samples, i, j;
glUseProgram(prog_0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_tex.handle);
multisampled_tex.set_viewport();
glGetIntegerv(GL_SAMPLES, &samples);
samples = MAX2(samples, 1);
glClear(GL_COLOR_BUFFER_BIT);
glUniform1i(glGetUniformLocation(prog_0, "samples"), samples);
piglit_draw_rect(-1, -1, 2, 2);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
glViewport(0, 0, piglit_width, piglit_height);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(prog_1);
glUniform1i(glGetUniformLocation(prog_1, "tex"), 0);
glUniform1i(glGetUniformLocation(prog_1, "samples"), samples);
if (samples <= 4)
piglit_draw_rect(-1, -1,
8*(1 << samples) * (2.0/piglit_width),
8 * (2.0/piglit_height));
else if (samples == 8)
piglit_draw_rect(-1, -1,
8*16 * (2.0/piglit_width),
8*16 * (2.0/piglit_height));
else
assert(0 && "Unimplemented");
for (i = 0; i < multisampled_tex.config.width; i++) {
float color[4];
unsigned full_mask = (1 << samples) - 1;
unsigned expected_mask = i & full_mask;
unsigned observed_mask = 0;
if (multisampled_tex.config.num_samples == 0)
expected_mask = full_mask;
glReadPixels((i % 16) * 8 + 4,
(i / 16) * 8 + 4,
1, 1, GL_RGBA, GL_FLOAT, color);
for (j = 0; j < 4; j++) {
if (equal(color[j], 1) || equal(color[j], 0.6))
observed_mask |= 1 << (j + 0);
if (equal(color[j], 1) || equal(color[j], 0.4))
observed_mask |= 1 << (j + 4);
}
if (expected_mask != observed_mask) {
printf("Test failed, samples = %u\n"
" Expected sample mask: 0x%x\n"
" Observed sample mask: 0x%x\n",
samples, expected_mask, observed_mask);
pass = false;
}
}
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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