tests/spec/ext_framebuffer_multisample/alpha-to-one-msaa-disabled.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-msaa-disabled.cpp
  28  *
  29  * Verify that alpha values are not modified if GL_SAMPLE_ALPHA_TO_ONE is
  30  * enabled and GL_MULTISAMPLE is disabled in a multisample buffer.
  31  *
  32  * This test operates by drawing a pattern in multisample FBO to generate
  33  * reference and test image. Reference image is drawn to right half of window
  34  * system frame buffer and test image to 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 print_usage_and_exit(char *prog_name)
  55 {
  56         printf("Usage: %s <num_samples>\n", prog_name);
  57         piglit_report_result(PIGLIT_FAIL);
  58 }
  59
  60 void
  61 piglit_init(int argc, char **argv)
  62 {
  63         int num_attachments = 1;
  64         int samples;
  65
  66         if (argc < 2)
  67                 print_usage_and_exit(argv[0]);
  68         {
  69                 char *endptr = NULL;
  70                 samples = strtol(argv[1], &endptr, 0);
  71                 if (endptr != argv[1] + strlen(argv[1]))
  72                         print_usage_and_exit(argv[0]);
  73         }
  74
  75         piglit_require_gl_version(21);
  76         piglit_require_extension("GL_ARB_framebuffer_object");
  77         piglit_require_extension("GL_ARB_vertex_array_object");
  78
  79         int pattern_width = piglit_width / 2;
  80         int pattern_height = piglit_height / num_attachments;
  81
  82         piglit_ortho_projection(pattern_width,
  83                                 pattern_height,
  84                                 GL_TRUE);
  85
  86         /* Skip the test if samples > GL_MAX_SAMPLES */
  87         GLint max_samples;
  88         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
  89
  90         if (samples > max_samples)
  91                 piglit_report_result(PIGLIT_SKIP);
  92
  93         ms_fbo_and_draw_buffers_setup(samples,
  94                                       pattern_width,
  95                                       pattern_height,
  96                                       num_attachments,
  97                                       GL_COLOR_BUFFER_BIT,
  98                                       GL_RGBA);
  99         shader_compile(false /* sample_alpha_to_coverage */,
 100                        false /* dual_src_blend */,
 101                        true /* frag_out_zero_write */);
 102 }
 103
 104 enum piglit_result
 105 piglit_display()
 106 {
 107         bool pass = true;
 108         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 109         glClearColor(0.0, 0.0, 0.0, 1.0);
 110         glClear(GL_COLOR_BUFFER_BIT);
 111         allocate_data_arrays();
 112
 113         /* Set sample_alpha_to_one = false to generate the reference image */
 114         draw_reference_image(false /* sample_alpha_to_coverage */,
 115                              false /* sample_alpha_to_one */);
 116
 117         /* Test multisample fbo with GL_SAMPLE_ALPHA_TO_ONE enabled but
 118          * GL_MULTISAMPLE disabled */
 119         glDisable(GL_MULTISAMPLE);
 120
 121         draw_test_image(false /* sample_alpha_to_coverage */,
 122                         true /* sample_alpha_to_one */);
 123
 124         glEnable(GL_MULTISAMPLE);
 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         /* Free the memory allocated for data arrays */
 134         free_data_arrays();
 135
 136         if (!piglit_automatic)
 137                 piglit_present_results();
 138
 139         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 140 }