tests/spec/ext_framebuffer_multisample/alpha-to-one-single-sample-buffer.cpp

   1 /*
   2  * Copyright © 2012 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "draw-buffers-common.h"
  25
  26 /**
  27  * \file alpha-to-one-single-sample-buffer.cpp
  28  *
  29  * Verify that alpha values are not modified if GL_SAMPLE_ALPHA_TO_ONE
  30  * is enabled and the buffer is single-sampled.
  31  *
  32  * This test operates by drawing a pattern in single sample FBO to generate
  33  * a reference and test image. Reference imag is drawn to the right half of
  34  * window system draw buffer and test image to the left half.
  35  *
  36  * Compare the left and right halves of window system frame buffer to verify
  37  * the test image.
  38  *
  39  * Author: Anuj Phogat <anuj.phogat@gmail.com>
  40  */
  41
  42 PIGLIT_GL_TEST_CONFIG_BEGIN
  43
  44         config.supports_gl_compat_version = 10;
  45
  46         config.window_width = 512;
  47         config.window_height = 256;
  48         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  49         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  50
  51 PIGLIT_GL_TEST_CONFIG_END
  52
  53 void
  54 piglit_init(int argc, char **argv)
  55 {
  56         const int num_attachments = 1;
  57         /* For single sample buffer */
  58         const int samples = 0;
  59
  60         piglit_require_gl_version(21);
  61         piglit_require_extension("GL_ARB_framebuffer_object");
  62         piglit_require_extension("GL_ARB_vertex_array_object");
  63
  64         int pattern_width = piglit_width / 2;
  65         int pattern_height = piglit_height / num_attachments;
  66
  67         piglit_ortho_projection(pattern_width,
  68                                 pattern_height,
  69                                 GL_TRUE);
  70
  71         /* Skip the test if samples > GL_MAX_SAMPLES */
  72         GLint max_samples;
  73         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
  74
  75         if (samples > max_samples)
  76                 piglit_report_result(PIGLIT_SKIP);
  77
  78         ms_fbo_and_draw_buffers_setup(samples,
  79                                       pattern_width,
  80                                       pattern_height,
  81                                       num_attachments,
  82                                       GL_COLOR_BUFFER_BIT,
  83                                       GL_RGBA);
  84         shader_compile(false /* sample_alpha_to_coverage */,
  85                        false /* dual_src_blend */,
  86                        true /* frag_out_zero_write */);
  87 }
  88
  89 enum piglit_result
  90 piglit_display()
  91 {
  92         bool pass = true;
  93         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
  94         glClearColor(0.0, 0.0, 0.0, 1.0);
  95         glClear(GL_COLOR_BUFFER_BIT);
  96         allocate_data_arrays();
  97
  98         /* Set sample_alpha_to_one = false to generate reference image */
  99         draw_reference_image(false /* sample_alpha_to_coverage */,
 100                              false /* sample_alpha_to_one */);
 101
 102         draw_test_image(false /* sample_alpha_to_coverage */,
 103                         true /* sample_alpha_to_one */);
 104
 105         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 106
 107         glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
 108         pass = piglit_probe_rect_halves_equal_rgba(0, 0,
 109                                                    piglit_width,
 110                                                    piglit_height)
 111                && pass;
 112
 113         /* Free the memory allocated for data arrays */
 114         free_data_arrays();
 115
 116         if (!piglit_automatic)
 117                 piglit_present_results();
 118
 119         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 120 }