tests/spec/ext_framebuffer_multisample/line-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 "piglit-test-pattern.h"
  25 #include "piglit-fbo.h"
  26 using namespace piglit_util_fbo;
  27 using namespace piglit_util_test_pattern;
  28
  29 /**
  30  * \file line-smooth.cpp
  31  *
  32  * Page 128 (in the PDF) of the OpenGL 3.0 spec says:
  33  * "If MULTISAMPLE is enabled, and the value of SAMPLE BUFFERS is one,
  34  * then lines are rasterized using the following algorithm, regardless
  35  * of whether line antialias-ing (LINE_SMOOTH) is enabled or disabled".
  36
  37  * This test operates by drawing a test pattern with GL_LINE_SMOOTH
  38  * disabled. Blit it in to right half of window system framebuffer.
  39  * This is our reference image.
  40  *
  41  * Draw the same test pattern second time with GL_LINE_SMOOTH enabled
  42  * in a multisample buffer. Blit it in to left half of window system
  43  * framebuffer. This is our test image.
  44  *
  45  * To verify that GL_LINE_SMOOTH don't affect MSAA, compare the two
  46  * halves of default framebuffer. They are expected to match.
  47  *
  48  */
  49
  50 PIGLIT_GL_TEST_CONFIG_BEGIN
  51
  52         config.supports_gl_compat_version = 10;
  53
  54         config.window_width = 512;
  55         config.window_height = 256;
  56         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DEPTH | PIGLIT_GL_VISUAL_STENCIL;
  57         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  58
  59 PIGLIT_GL_TEST_CONFIG_END
  60
  61 const int pattern_width = 256; const int pattern_height = 256;
  62
  63 Fbo test_fbo;
  64 TestPattern *test_pattern = NULL;
  65 GLbitfield buffer_to_test;
  66
  67 void
  68 print_usage_and_exit(char *prog_name)
  69 {
  70         printf("Usage: %s <num_samples>\n",
  71                prog_name);
  72         piglit_report_result(PIGLIT_FAIL);
  73 }
  74
  75 void
  76 piglit_init(int argc, char **argv)
  77 {
  78         int num_samples;
  79         if (argc < 2)
  80                 print_usage_and_exit(argv[0]);
  81         {
  82                 char *endptr = NULL;
  83                 num_samples = strtol(argv[1], &endptr, 0);
  84                 if (endptr != argv[1] + strlen(argv[1]))
  85                         print_usage_and_exit(argv[0]);
  86         }
  87
  88         piglit_require_gl_version(21);
  89         piglit_require_extension("GL_ARB_framebuffer_object");
  90         piglit_require_extension("GL_ARB_vertex_array_object");
  91
  92         glClear(GL_COLOR_BUFFER_BIT);
  93
  94         /* Skip the test if num_samples > GL_MAX_SAMPLES */
  95         GLint max_samples;
  96         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
  97         if (num_samples > max_samples)
  98                 piglit_report_result(PIGLIT_SKIP);
  99
 100         buffer_to_test = GL_COLOR_BUFFER_BIT;
 101         test_pattern = new Lines();
 102         test_pattern->compile();
 103
 104         test_fbo.setup(FboConfig(num_samples, pattern_width, pattern_height));
 105
 106         glEnable (GL_BLEND);
 107         glBlendFunc (GL_SRC_ALPHA_SATURATE, GL_ONE);
 108 }
 109
 110 enum piglit_result
 111 piglit_display()
 112 {
 113         bool pass = true;
 114         float proj[4][4] = {
 115                 { 1, 0, 0, 0 },
 116                 { 0, 1, 0, 0 },
 117                 { 0, 0, 1, 0 },
 118                 { 0, 0, 0, 1 } };
 119         /* Draw test pattern in  multisample test_fbo with GL_LINE_SMOOTH
 120          * disabled.
 121          */
 122         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, test_fbo.handle);
 123         glClear(buffer_to_test);
 124         test_fbo.set_viewport();
 125         test_pattern->draw(proj);
 126
 127         /* Blit test_fbo to the right half of window system framebuffer.
 128          * This is the reference image.
 129          */
 130         glBindFramebuffer(GL_READ_FRAMEBUFFER, test_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         /* Draw test pattern in mulisample test_fbo with GL_LINE_SMOOTH
 137          * enabled
 138          */
 139         glEnable(GL_LINE_SMOOTH);
 140         glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
 141
 142         /* Disable depth test to correctly render overlapping smooth
 143          * primitives. Otherwise we have to render the primitives in
 144          * back to front order
 145          */
 146         glDisable (GL_DEPTH_TEST);
 147
 148         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, test_fbo.handle);
 149         test_fbo.set_viewport();
 150         test_pattern->draw(proj);
 151
 152         glDisable(GL_LINE_SMOOTH);
 153
 154         /* Now blit test_fbo to the left half of window system framebuffer.
 155          * This is the test image.
 156          */
 157         glBindFramebuffer(GL_READ_FRAMEBUFFER, test_fbo.handle);
 158         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 159         glBlitFramebuffer(0, 0, pattern_width, pattern_height,
 160                           0, 0, pattern_width, pattern_height,
 161                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
 162
 163         /* Check that the left and right halves of the screen match. If they
 164          * don't, then GL_LINE_SMOOTH is not ignored with multisample
 165          * rendering.
 166          */
 167         glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
 168         pass = piglit_probe_rect_halves_equal_rgba(0, 0, piglit_width,
 169                                                    piglit_height) && pass;
 170
 171         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 172
 173         piglit_present_results();
 174
 175         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 176 }