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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.
*
* Authors:
* Chris Forbes <chrisf@ijw.co.nz>
*
*/
/*
* fbo-mrt-alphatest asserts correct behavior for alpha-testing of fragments
* when multiple color buffers are being rendered to. In particular, the alpha
* component of the first color output is used for the alpha test.
*
* This is important for deferred renderers which use alpha-test, and is a
* significant edge case for the i965 driver.
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 21;
config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
GLenum buffers[] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1 };
GLuint fbo;
GLint prog;
GLuint color0, color1;
void
piglit_init(int argc, char **argv)
{
piglit_require_GLSL_version(130);
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glGenTextures(1, &color0);
glBindTexture(GL_TEXTURE_2D, color0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 64, 64, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, color0, 0);
glGenTextures(1, &color1);
glBindTexture(GL_TEXTURE_2D, color1);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 64, 64, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, color1, 0);
glDrawBuffers(2, buffers);
prog = piglit_build_simple_program(
"#version 130\n"
"in vec4 pos;\n"
"void main() {\n"
" gl_Position = pos;\n"
"}\n",
"#version 130\n"
"void main() {\n"
" float alpha = float(int(gl_FragCoord.x / 16 + gl_FragCoord.y / 16) % 2);\n"
" gl_FragData[0] = vec4(1.0, 0.0, 0.0, alpha);\n"
" gl_FragData[1] = vec4(0.0, 1.0, 0.0, 1.0);\n"
"}\n"
);
if (!piglit_check_gl_error(GL_NO_ERROR)) {
printf("Setup for test failed.\n");
piglit_report_result(PIGLIT_SKIP);
}
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
printf("Framebuffer not complete.\n");
piglit_report_result(PIGLIT_SKIP);
}
}
enum piglit_result
piglit_display(void)
{
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glClearColor(0,0,1,0);
glClear(GL_COLOR_BUFFER_BIT);
glAlphaFunc(GL_GEQUAL, 0.5f);
glEnable(GL_ALPHA_TEST);
glUseProgram(prog);
glViewport(0, 0, 64, 64);
piglit_draw_rect(-1, -1, 2, 2);
glDisable(GL_ALPHA_TEST);
/* visualize it */
glUseProgram(0);
glBindFramebuffer(GL_FRAMEBUFFER, piglit_winsys_fbo);
glViewport(0, 0, 128, 64);
glClearColor(0,0,0.5,0);
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, color0);
piglit_draw_rect_tex(-1, -1, 1, 2,
0, 0, 1, 1);
glBindTexture(GL_TEXTURE_2D, color1);
piglit_draw_rect_tex(0, -1, 1, 2,
0, 0, 1, 1);
glDisable(GL_TEXTURE_2D);
{
bool pass = true;
float red[] = {1,0,0};
float green[] = {0,1,0};
float blue[] = {0,0,1};
pass = piglit_probe_pixel_rgb(4, 4, blue) && pass;
pass = piglit_probe_pixel_rgb(12, 4, red) && pass;
pass = piglit_probe_pixel_rgb(64 + 4, 4, blue) && pass;
pass = piglit_probe_pixel_rgb(64 + 12, 4, green) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
}
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