tests/spec/ext_framebuffer_multisample/polygon-smooth.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 "common.h"
  25 using namespace piglit_util_fbo;
  26 using namespace piglit_util_test_pattern;
  27
  28 /**
  29  * \file polygon-smooth.cpp
  30  *
  31  * Page 134 (in the PDF) of the OpenGL 3.0 spec says:
  32  * "If MULTISAMPLE is enabled, and the value of SAMPLE BUFFERS is one,
  33  * then polygons are rasterized using the following algorithm, regardless
  34  * of whether polygon antialias-ing (POLYGON_SMOOTH) is enabled or disabled".
  35  *
  36  * This test operates by drawing a test pattern in to multisample fbo with
  37  * GL_POLYGON_SMOOTH disabled. Blits it in to right half of window system
  38  * framebuffer. This is used as reference image.
  39  *
  40  * Draw the same test pattern for the second time in multisample buffer with
  41  * GL_POLYGON_SMOOTH enabled. Blit it in to left half of window system
  42  * framebuffer. This is the test image.
  43  *
  44  * To verify that GL_POLYGON_SMOOTH is ignored during MSAA, compare the two
  45  * halves of default framebuffer. They are expected to match.
  46  */
  47
  48 PIGLIT_GL_TEST_CONFIG_BEGIN
  49
  50         config.supports_gl_compat_version = 10;
  51
  52         config.window_width = 512;
  53         config.window_height = 256;
  54         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DEPTH | PIGLIT_GL_VISUAL_STENCIL;
  55         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  56
  57 PIGLIT_GL_TEST_CONFIG_END
  58
  59 const int pattern_width = 256; const int pattern_height = 256;
  60
  61 Fbo ms_fbo;
  62 Test *test = NULL;
  63 GLbitfield buffer_to_test;
  64 TestPattern *test_pattern = NULL;
  65
  66 void
  67 print_usage_and_exit(char *prog_name)
  68 {
  69         printf("Usage: %s <num_samples>\n",
  70                prog_name);
  71         piglit_report_result(PIGLIT_FAIL);
  72 }
  73
  74 void
  75 piglit_init(int argc, char **argv)
  76 {
  77         int num_samples;
  78         if (argc < 2)
  79                 print_usage_and_exit(argv[0]);
  80         {
  81                 char *endptr = NULL;
  82                 num_samples = strtol(argv[1], &endptr, 0);
  83                 if (endptr != argv[1] + strlen(argv[1]))
  84                         print_usage_and_exit(argv[0]);
  85         }
  86
  87         piglit_require_gl_version(21);
  88         piglit_require_extension("GL_ARB_framebuffer_object");
  89         piglit_require_extension("GL_ARB_vertex_array_object");
  90
  91         /* Skip the test if num_samples > GL_MAX_SAMPLES */
  92         GLint max_samples;
  93         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
  94         if (num_samples > max_samples)
  95                 piglit_report_result(PIGLIT_SKIP);
  96
  97         buffer_to_test = GL_COLOR_BUFFER_BIT;
  98
  99         test_pattern = new Triangles();
 100         test_pattern->compile();
 101
 102         ms_fbo.setup(FboConfig(num_samples, pattern_width, pattern_height));
 103
 104         /* Enable blending to test GL_POLYGON_SMOOTH */
 105         glEnable (GL_BLEND);
 106         glBlendFunc (GL_SRC_ALPHA_SATURATE, GL_ONE);
 107 }
 108
 109 enum piglit_result
 110 piglit_display()
 111 {
 112         bool pass = true;
 113         float proj[4][4] = {
 114                 { 1, 0, 0, 0 },
 115                 { 0, 1, 0, 0 },
 116                 { 0, 0, 1, 0 },
 117                 { 0, 0, 0, 1 }
 118         };
 119
 120         /* Draw test pattern in  multisample ms_fbo with GL_POLYGON_SMOOTH
 121          * disabled.
 122          */
 123         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo.handle);
 124         ms_fbo.set_viewport();
 125         test_pattern->draw(proj);
 126
 127         /* Blit ms_fbo to the right half of window system framebuffer. This
 128          * is a reference image to test MSAA with polygon smooth.
 129          */
 130         glBindFramebuffer(GL_READ_FRAMEBUFFER, ms_fbo.handle);
 131         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 132         glBlitFramebuffer(0, 0, pattern_width, pattern_height,
 133                           pattern_width, 0, 2 * pattern_width, pattern_height,
 134                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
 135
 136         /* Now draw test pattern in mulisample ms_fbo with GL_POLYGON_SMOOTH
 137          * enabled
 138          */
 139         glDisable(GL_DEPTH_TEST);
 140         glEnable(GL_POLYGON_SMOOTH);
 141         glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST);
 142
 143         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo.handle);
 144         ms_fbo.set_viewport();
 145
 146         glClear(buffer_to_test);
 147         test_pattern->draw(proj);
 148
 149         glDisable(GL_POLYGON_SMOOTH);
 150
 151         /* Blit ms_fbo to the left half of window system framebuffer. This
 152          * is the test image.
 153          */
 154         glBindFramebuffer(GL_READ_FRAMEBUFFER, ms_fbo.handle);
 155         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 156         glBlitFramebuffer(0, 0, pattern_width, pattern_height,
 157                           0, 0, pattern_width, pattern_height,
 158                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
 159
 160         /* Check that the left and right halves of the screen match. If they
 161          * don't, then GL_POLYGON_SMOOTH is not ignored with multisample
 162          * rendering.
 163          */
 164         glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
 165         pass = piglit_probe_rect_halves_equal_rgba(0, 0, piglit_width,
 166                                                    piglit_height) && pass;
 167         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 168
 169         piglit_present_results();
 170         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 171 }