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/*
* Copyright © 2012 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 alpha-blending.c
*
* This test checks for Mesa bug 53077 (Output error with msaa when
* both of framebuffer and source color's alpha are not 1). The test
* operates by drawing a partially transparent non-square rectangle to
* a multisampled buffer (using a triangle fan) and then blitting the
* result to the screen. If the bug is present, artifacts will appear
* along the rectangle diagonal due to alpha blending being performed
* incorrectly while drawing the first triangle of the fan.
*
* See also https://bugs.freedesktop.org/show_bug.cgi?id=53077
*
* Note: when fast color clears are implemented for MSAA buffers, it's
* possible that they will cover up this bug. To avoid that, the test
* can be supplied a command-line option of "slow_cc", which causes it
* to use a clear color that cannot be fast cleared.
*/
#include "piglit-util-gl.h"
GLuint framebuffer, renderbuffer;
#define WIDTH 300
#define HEIGHT 350
int numSamples;
static bool slow_color_clear = false;
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = WIDTH;
config.window_height = HEIGHT;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
config.khr_no_error_support = PIGLIT_NO_ERRORS;
slow_color_clear = PIGLIT_STRIP_ARG("slow_cc");
PIGLIT_GL_TEST_CONFIG_END
void
piglit_init(int argc, char **argv)
{
glGetIntegerv(GL_MAX_SAMPLES_EXT, &numSamples);
glGenFramebuffersEXT(1, &framebuffer);
glGenRenderbuffersEXT(1, &renderbuffer);
glBindFramebufferEXT(GL_FRAMEBUFFER, framebuffer);
glBindRenderbufferEXT(GL_RENDERBUFFER, renderbuffer);
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER, numSamples, GL_RGBA, WIDTH, HEIGHT);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, renderbuffer);
glEnable (GL_MULTISAMPLE);
}
enum piglit_result
piglit_display()
{
GLenum src_factor, dst_factor;
float expected_color[] = { 0.0, 0.7, 0.0, 0.79 };
int x0 = 140;
int x1 = 220;
int y0 = 55;
int y1 = 165;
bool pass = true;
float vertex_data[][2] = {
{ ((float) x0)/WIDTH * 2.0 - 1.0, ((float) y0)/HEIGHT * 2.0 - 1.0 },
{ ((float) x1)/WIDTH * 2.0 - 1.0, ((float) y0)/HEIGHT * 2.0 - 1.0 },
{ ((float) x1)/WIDTH * 2.0 - 1.0, ((float) y1)/HEIGHT * 2.0 - 1.0 },
{ ((float) x0)/WIDTH * 2.0 - 1.0, ((float) y1)/HEIGHT * 2.0 - 1.0 },
};
glBindFramebufferEXT(GL_FRAMEBUFFER,framebuffer);
if (slow_color_clear) {
glColor4f (0.0, 1.0, 0.5, 0.7);
glClearColor(0.0, 0.0, 0.5, 1.0);
expected_color[2] = 0.5;
} else {
glColor4f (0.0, 1.0, 0.0, 0.7);
glClearColor(0.0, 0.0, 0.0, 1.0);
}
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_BLEND);
src_factor = GL_SRC_ALPHA;
dst_factor = GL_ONE_MINUS_SRC_ALPHA;
glBlendFunc (src_factor, dst_factor);
glVertexPointer(2, GL_FLOAT, 0, vertex_data);
glEnableClientState(GL_VERTEX_ARRAY);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glBindFramebufferEXT(GL_READ_FRAMEBUFFER, framebuffer);
glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
glBlitFramebuffer(0, 0, WIDTH, HEIGHT, 0, 0, WIDTH, HEIGHT, GL_COLOR_BUFFER_BIT, GL_NEAREST);
glBindFramebuffer(GL_FRAMEBUFFER, piglit_winsys_fbo);
pass = piglit_probe_rect_rgba(x0, y0, x1 - x0, y1 - y0, expected_color)
&& pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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