tests/spec/ext_framebuffer_multisample/alpha-to-one-dual-src-blend.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-dual-src-blend.cpp
  28  *
  29  * Verify sample-alpha-to-one with dual source blending.
  30  *
  31  * This test operates by drawing a pattern in multisample FBO to generate
  32  * a reference and test image. Reference image is drawn to the right half of
  33  * window system draw buffer and test image to the left half.
  34  *
  35  * Compare the left and right halves of window system frame buffer to verify
  36  * the test image.
  37  *
  38  * Author: Anuj Phogat <anuj.phogat@gmail.com>
  39  */
  40
  41 PIGLIT_GL_TEST_CONFIG_BEGIN
  42
  43         config.supports_gl_compat_version = 10;
  44
  45         config.window_width = 512;
  46         config.window_height = 256;
  47         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  48         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  49
  50 PIGLIT_GL_TEST_CONFIG_END
  51 void
  52 print_usage_and_exit(char *prog_name)
  53 {
  54         printf("Usage: %s <num_samples>\n", prog_name);
  55         piglit_report_result(PIGLIT_FAIL);
  56 }
  57
  58 void
  59 piglit_init(int argc, char **argv)
  60 {
  61         int samples;
  62         const int num_attachments = 1;
  63
  64         if (argc < 2)
  65                 print_usage_and_exit(argv[0]);
  66         {
  67                 char *endptr = NULL;
  68                 samples = strtol(argv[1], &endptr, 0);
  69                 if (endptr != argv[1] + strlen(argv[1]))
  70                         print_usage_and_exit(argv[0]);
  71         }
  72
  73         piglit_require_gl_version(30);
  74
  75         int pattern_width = piglit_width / 2;
  76         int pattern_height = piglit_height / num_attachments;
  77
  78         piglit_ortho_projection(pattern_width,
  79                                 pattern_height,
  80                                 GL_TRUE);
  81
  82         /* Skip the test if samples > GL_MAX_SAMPLES */
  83         GLint max_samples;
  84         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
  85
  86         if (samples > max_samples)
  87                 piglit_report_result(PIGLIT_SKIP);
  88
  89         ms_fbo_and_draw_buffers_setup(samples,
  90                                       pattern_width,
  91                                       pattern_height,
  92                                       num_attachments,
  93                                       GL_COLOR_BUFFER_BIT,
  94                                       GL_RGBA);
  95
  96         shader_compile(false /* sample_alpha_to_coverage */,
  97                        true /* dual_src_blend */,
  98                        true /* frag_out_zero_write */);
  99 }
 100
 101 enum piglit_result
 102 piglit_display()
 103 {
 104         bool pass = true;
 105         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 106         glClearColor(0.0, 0.0, 0.0, 1.0);
 107         glClear(GL_COLOR_BUFFER_BIT);
 108         allocate_data_arrays();
 109
 110         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC1_ALPHA);
 111
 112         /* Reference image is drawn using expected color values and
 113          * represents an expected output for the test image.
 114          */
 115         draw_reference_image(false /* sample_alpha_to_coverage */,
 116                              true /* sample_alpha_to_one */);
 117
 118         glEnable(GL_BLEND);
 119         draw_test_image(false /* sample_alpha_to_coverage */,
 120                         true /* sample_alpha_to_one */);
 121
 122         glDisable(GL_BLEND);
 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 }