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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.
*/
#include "common.h"
/**
* @file turn-on-off.c
* This test varifies turning multisampling on/off by setting up FBO with
* appropriate sample count.
* Test algorithm:
* 1. Render the geometry to left half of default framebuffer and read color
* buffer in to a local buffer.
*
* 2. Create a FBO with MSAA turned OFF. Compare the rendered geometry with
* buffer in Step 1. It is expected to match.
*
* 3. Turn ON MSAA in FBO. Render the scene, draw reference image and measure
* the accuracy of MSAA. This varifies if MSAA is turned ON.
*
* 4. Turn OFF MSAA in FBO. Render the scene and compare to the buffer in
* step 1. It is expected to match.
*
* Test image is rendered in to left half of framebuffer.
* Reference image is rendered in to right half of framebuffer.
*
* TODO: Add testing for depth and stencil buffers.
*/
PIGLIT_GL_TEST_CONFIG_BEGIN
config.window_width = 512;
config.window_height = 256;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_ALPHA;
PIGLIT_GL_TEST_CONFIG_END
static int num_samples = 0;
const int pattern_width = 256;
const int pattern_height = 256;
Test *test = NULL;
enum piglit_result
piglit_display(void)
{
bool pass = true;
GLint w = pattern_width, h = pattern_height;
GLfloat *color_buffer = NULL;
test->draw_to_default_framebuffer();
/* Read color buffer */
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
color_buffer = (GLfloat *) malloc(w * h * 4 * sizeof(float));
glReadPixels(0, 0, w, h, GL_RGBA, GL_FLOAT, color_buffer);
/* Draw the test pattern in to test_fbo with num_samples = 0. This
* is to verify if glRenderbufferStorageMultisample() with zero sample
* count turns off MSAA.
*/
test->test_fbo.set_samples(0);
test->draw_test_image(&test->test_fbo);
/* Compare rendered scene with color_buffer */
glBindFramebuffer(GL_READ_FRAMEBUFFER, test->test_fbo.handle);
pass = piglit_probe_image_rgba(0, 0, w, h, color_buffer)
&& pass;
/* Switch ON MSAA in this FBO by passing num_samples > 0 */
test->test_fbo.set_samples(num_samples);
/* Draw test image in multisample FBO */
test->draw_test_image(&test->test_fbo);
/* Draw a reference image for MSAA */
test->draw_reference_image();
/* Measure the accuracy of MSAA in multisample FBO by comparing the
* test image to reference image. This varifies if MSAA is actually
* switched on.
*/
pass = test->measure_accuracy() && pass;
/* Switch OFF MSAA again in this FBO */
test->test_fbo.set_samples(0);
test->draw_test_image(&test->test_fbo);
/* Compare rendered scene with color_buffer */
glBindFramebuffer(GL_READ_FRAMEBUFFER, test->test_fbo.handle);
pass = piglit_probe_image_rgba(0, 0, w, h, color_buffer)
&& pass;
if (!piglit_automatic)
piglit_present_results();
return (pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
void
print_usage_and_exit(char *prog_name)
{
printf("Usage: %s <num_samples>\n", prog_name);
piglit_report_result(PIGLIT_FAIL);
}
void
piglit_init(int argc, char **argv)
{
GLint max_samples;
if (argc < 2)
print_usage_and_exit(argv[0]);
{
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_gl_version(30);
/* Skip the test if num_samples > GL_MAX_SAMPLES */
glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
if (num_samples > max_samples) {
printf("Sample count not supported : %d\n", num_samples);
piglit_report_result(PIGLIT_SKIP);
}
test = create_test(TEST_TYPE_COLOR, num_samples,
false /*small*/,
true /* combine_depth_stencil */,
pattern_width, pattern_height,
16 /* supersample_factor */);
}
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