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/*
* Copyright (c) 2015 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-mask-mrt-alpha.cpp
*
* This test verifies that assigning gl_SampleMask[] from the
* fragment shader works as expected in cases where the
* implementation is required to supply an additional alpha component
* previously written to a different color attachment to render to a
* non-zero attachment of a multisample FBO (e.g. while using
* alpha-to-coverage).
*/
#include "piglit-fbo.h"
using namespace piglit_util_fbo;
#define NUM_SAMPLES 4
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 Fbo
make_fbo()
{
FboConfig config(NUM_SAMPLES, piglit_width, piglit_height);
config.num_rb_attachments = 0;
config.num_tex_attachments = 2;
config.tex_attachment[0] = GL_COLOR_ATTACHMENT0;
config.tex_attachment[1] = GL_COLOR_ATTACHMENT1;
Fbo fbo;
fbo.setup(config);
if (!piglit_check_gl_error(GL_NO_ERROR))
piglit_report_result(PIGLIT_FAIL);
return fbo;
}
/**
* Render to both texture attachments of the multisample fbo enabling
* alpha-to-coverage to make the implementation pass the additional
* alpha component from the first attachment when rendering into the
* second. The resulting sample mask will still be 5 as specified in
* the fragment shader because an alpha value of 1.0 maps to the
* coverage mask ~0.
*/
static bool
run_test(Fbo &fbo)
{
const GLuint prog = piglit_build_simple_program(
"#version 130\n"
"in vec4 piglit_vertex;\n"
"\n"
"void main()\n"
"{\n"
" gl_Position = piglit_vertex;\n"
"}\n",
"#version 130\n"
"#extension GL_ARB_sample_shading : enable\n"
"\n"
"out vec4 out_color[2];"
"\n"
"void main()\n"
"{\n"
" gl_SampleMask[0] = 5;\n"
" out_color[0] = vec4(1.0, 0.0, 0.0, 1.0);\n"
" out_color[1] = vec4(1.0, 0.0, 0.0, 0.0);\n"
"}\n");
glUseProgram(prog);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo.handle);
glDrawBuffers(fbo.config.num_tex_attachments,
fbo.config.tex_attachment);
glEnable(GL_SAMPLE_ALPHA_TO_COVERAGE);
fbo.set_viewport();
glClear(GL_COLOR_BUFFER_BIT);
piglit_draw_rect(-1, -1, 2, 2);
glDisable(GL_SAMPLE_ALPHA_TO_COVERAGE);
glDeleteProgram(prog);
return piglit_check_gl_error(GL_NO_ERROR);
}
/**
* Resolve the red component of each sample from the texture
* previously bound to color attachment i as the RGBA components of
* the actual framebuffer. Return true if only the first and third
* samples were written according to the coverage mask set by the
* shader.
*/
static bool
check(const Fbo &fbo, unsigned i)
{
const float expected[] = { 1, 0, 1, 0 };
const GLuint prog = piglit_build_simple_program(
"#version 130\n"
"in vec4 piglit_vertex;\n"
"\n"
"void main()\n"
"{\n"
" gl_Position = piglit_vertex;\n"
"}\n",
"#version 130\n"
"#extension GL_ARB_texture_multisample : require\n"
"\n"
"uniform sampler2DMS tex;\n"
"out vec4 out_color;\n"
"\n"
"void main()\n"
"{\n"
" vec4 v;\n"
"\n"
" for (int i = 0; i < 4; i++)\n"
" v[i] = texelFetch(tex, ivec2(gl_FragCoord.x,\n"
" gl_FragCoord.y), i).x;\n"
"\n"
" out_color = v;\n"
"}\n");
glUseProgram(prog);
glUniform1i(glGetUniformLocation(prog, "tex"), 0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, fbo.color_tex[i]);
glViewport(0, 0, piglit_width, piglit_height);
glClear(GL_COLOR_BUFFER_BIT);
piglit_draw_rect(-1, -1, 2, 2);
glDeleteProgram(prog);
if (!piglit_check_gl_error(GL_NO_ERROR))
return false;
if (!piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height,
expected)) {
printf(" Attachment: %d\n", i);
return false;
}
return true;
}
void
piglit_init(int argc, char **argv)
{
piglit_require_extension("GL_ARB_texture_multisample");
piglit_require_extension("GL_ARB_sample_shading");
piglit_require_GLSL_version(130);
Fbo fbo = make_fbo();
if (run_test(fbo) && check(fbo, 0) && check(fbo, 1))
piglit_report_result(PIGLIT_PASS);
else
piglit_report_result(PIGLIT_FAIL);
}
piglit_result
piglit_display()
{
return PIGLIT_FAIL;
}
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