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