tests/spec/ext_framebuffer_multisample/int-draw-buffers-alpha-to-coverage.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 int-draw-buffers-alpha-to-coverage.cpp
  28  *
  29  * Verify sample alpha to coverage with integer draw buffers.
  30  *
  31  * When draw buffer zero is bound to an integer format buffer,
  32  * GL_SAMPLE_ALPHA_TO_COVERAGE should have no effect. This should work
  33  * properly even if there are other draw buffers that are not in integer
  34  * format.
  35  *
  36  * This test operates by drawing a pattern in multisample FBO to generate
  37  * reference and test images for all the draw buffers. Reference images are drawn
  38  * to right half of window system draw buffer and test images to left half.
  39  *
  40  * Compare the left and right halves of window system frame buffer to verify
  41  * the test image.
  42  *
  43  * Author: Anuj Phogat <anuj.phogat@gmail.com>
  44  */
  45
  46 PIGLIT_GL_TEST_CONFIG_BEGIN
  47
  48         config.supports_gl_compat_version = 10;
  49
  50         config.window_width = 512;
  51         config.window_height = 768;
  52         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  53         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  54
  55 PIGLIT_GL_TEST_CONFIG_END
  56
  57 /* At present fragment shader in draw-buffers-common.cpp supports only
  58  * fixed number of attachments = 3.
  59  */
  60 static int num_attachments = 3;
  61 static int samples;
  62
  63 void
  64 print_usage_and_exit(char *prog_name)
  65 {
  66         printf("Usage: %s <num_samples>\n", prog_name);
  67         piglit_report_result(PIGLIT_FAIL);
  68 }
  69
  70 void
  71 piglit_init(int argc, char **argv)
  72 {
  73
  74         if (argc < 2)
  75                 print_usage_and_exit(argv[0]);
  76         {
  77                 char *endptr = NULL;
  78                 samples = strtol(argv[1], &endptr, 0);
  79                 if (endptr != argv[1] + strlen(argv[1]))
  80                         print_usage_and_exit(argv[0]);
  81         }
  82
  83         piglit_require_gl_version(30);
  84
  85         int pattern_width = piglit_width / 2;
  86         int pattern_height = piglit_height / num_attachments;
  87
  88         piglit_ortho_projection(pattern_width,
  89                                 pattern_height,
  90                                 GL_TRUE);
  91         /* Skip the test if samples > GL_MAX_SAMPLES */
  92         GLint max_samples;
  93         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
  94
  95         if (samples > max_samples)
  96                 piglit_report_result(PIGLIT_SKIP);
  97         /* Testing of integer formats other than GL_RGBA8I is not supported
  98          * by utility functions in draw-buffers-common.cpp.
  99          */
 100         ms_fbo_and_draw_buffers_setup(samples,
 101                                       pattern_width,
 102                                       pattern_height,
 103                                       num_attachments,
 104                                       GL_COLOR_BUFFER_BIT,
 105                                       GL_RGBA8I);
 106         shader_compile(true /* sample_alpha_to_coverage */,
 107                        false /* dual_src_blend */,
 108                        true /* frag_out_zero_write */);
 109 }
 110
 111 enum piglit_result
 112 piglit_display()
 113 {
 114         bool pass = true;
 115         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 116         glClearColor(0.0, 0.0, 0.0, 1.0);
 117         glClear(GL_COLOR_BUFFER_BIT);
 118         allocate_data_arrays();
 119
 120         draw_reference_image(true /* sample_alpha_to_coverage */,
 121                              false /* sample_alpha_to_one */);
 122
 123         draw_test_image(true /* sample_alpha_to_coverage */,
 124                         false /* sample_alpha_to_one */);
 125
 126         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 127
 128         glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
 129         pass = piglit_probe_rect_halves_equal_rgba(0, 0,
 130                                                    piglit_width,
 131                                                    piglit_height)
 132                && pass;
 133
 134         /* Free the memory allocated for data arrays */
 135         free_data_arrays();
 136
 137         if (!piglit_automatic)
 138                 piglit_present_results();
 139
 140         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 141 }