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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 enable-flag.cpp
*
* This test verifies the proper functioning of the GL_MULTISAMPLE
* flag. From the GL 3.0 spec (p.116):
*
* "Multisample rasterization is enabled or disabled by calling
* Enable or Disable with the symbolic constant MULTISAMPLE."
*
* Elsewhere in the spec, where multisample rasterization is described
* (sections 3.4.3, 3.5.4, and 3.6.6), the following text is
* consistently used:
*
* "If MULTISAMPLE is enabled, and the value of SAMPLE_BUFFERS is
* one, then..."
*
* So, in other words, disabling GL_MULTISAMPLE should prevent
* multisample rasterization from occurring, even if the draw
* framebuffer is multisampled.
*
*
* This test operates by performing the following operations:
*
* 1. Verify that the default state of GL_MULTISAMPLE is enabled.
*
* 2. Draw a test image into a multisampled buffer, with
* GL_MULTISAMPLE disabled.
*
* 3. Blit this image to the left half of the piglit window (which is
* not multisampled) to resolve it.
*
* 4. Draw the same test image into a single-sampled buffer.
*
* 5. Blit this image to the right half of the piglit window.
*
* 6. Verify that the two halves of the piglit window match. If they
* don't, then presumably the disabling of GL_MULTISAMPLE failed to
* take effect.
*/
#include "common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = 512;
config.window_height = 256;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
PIGLIT_GL_TEST_CONFIG_END
namespace {
const int pattern_width = 256; const int pattern_height = 256;
Fbo singlesampled_fbo;
Fbo multisampled_fbo;
Triangles triangles;
extern "C" void
piglit_init(int argc, char **argv)
{
piglit_require_gl_version(21);
piglit_require_extension("GL_ARB_framebuffer_object");
piglit_require_extension("GL_ARB_vertex_array_object");
GLint max_samples;
glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
singlesampled_fbo.setup(FboConfig(0, pattern_width,
pattern_height));
multisampled_fbo.setup(FboConfig(max_samples, pattern_width,
pattern_height));
triangles.compile();
}
extern "C" enum piglit_result
piglit_display()
{
bool pass = true;
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glViewport(0, 0, piglit_width, piglit_height);
glClear(GL_COLOR_BUFFER_BIT);
/* Verify that the default state of GL_MULTISAMPLE is
* enabled.
*/
pass = glIsEnabled(GL_MULTISAMPLE) && pass;
/* Draw a test image into a multisampled buffer, with
* GL_MULTISAMPLE disabled.
*/
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_fbo.handle);
multisampled_fbo.set_viewport();
glDisable(GL_MULTISAMPLE);
triangles.draw(TestPattern::no_projection);
glEnable(GL_MULTISAMPLE);
/* Blit this image to the left half of the piglit window
* (which is not multisampled) to resolve it.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBlitFramebuffer(0, 0, pattern_width, pattern_height,
0, 0, pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
/* Draw the same test image into a single-sampled buffer. */
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, singlesampled_fbo.handle);
singlesampled_fbo.set_viewport();
triangles.draw(TestPattern::no_projection);
/* Blit this image to the right half of the piglit window. */
glBindFramebuffer(GL_READ_FRAMEBUFFER, singlesampled_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBlitFramebuffer(0, 0, pattern_width, pattern_height,
pattern_width, 0, 2*pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
/* Verify that the two halves of the piglit window match. If
* they don't, then presumably the disabling of GL_MULTISAMPLE
* failed to take effect.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
pass = piglit_probe_rect_halves_equal_rgba(0, 0, 2*pattern_width,
pattern_height) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
} /* Anonymous namespace */
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