tests/spec/ext_framebuffer_multisample/upsample.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 #include "piglit-test-pattern.h"
  24 #include "piglit-fbo.h"
  25 using namespace piglit_util_fbo;
  26 using namespace piglit_util_test_pattern;
  27
  28 /**
  29  * \file upsample.cpp
  30  *
  31  * Verify the accuracy of upsampling from a non-MSAA buffer to an MSAA
  32  * buffer.
  33  *
  34  * This test operates by drawing a test image in the window system
  35  * framebuffer (which is non-MSAA), and then blitting it to an MSAA
  36  * framebuffer, forcing the implementation to upsample it.
  37  *
  38  * To verify that upsampling has properly replicated each pixel value
  39  * in each of its samples, we blit from the MSAA buffer back to the
  40  * window system framebuffer.  This causes all of the samples for each
  41  * pixel to be blended, so if any of the pixels were not upsampled
  42  * correctly, we would expect the downsampled image to be different
  43  * from the original image.
  44  *
  45  * When testing depth and stencil buffers, we need to modify this
  46  * procedure slightly, since downsampling depth and stencil buffers
  47  * doesn't cause the pixels to be blended.  So, after the first blit,
  48  * we execute a "manifest pass" to translate the depth or stencil
  49  * image into a color image.  This is done independently in both the
  50  * MSAA and non-MSAA buffers.  Then we downsample the resulting color
  51  * image as before.
  52  *
  53  * Note: this test relies on proper functioning of the MSAA buffer and
  54  * the downsample blit.  These are already adequately tested by
  55  * accuracy.cpp.
  56  */
  57
  58 PIGLIT_GL_TEST_CONFIG_BEGIN
  59
  60         config.supports_gl_compat_version = 10;
  61
  62         config.window_width = 512;
  63         config.window_height = 256;
  64         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DEPTH | PIGLIT_GL_VISUAL_STENCIL;
  65         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  66
  67 PIGLIT_GL_TEST_CONFIG_END
  68
  69 const int pattern_width = 256; const int pattern_height = 256;
  70
  71 Fbo multisample_fbo;
  72 TestPattern *test_pattern = NULL;
  73 ManifestProgram *manifest_program = NULL;
  74 GLbitfield buffer_to_test;
  75 GLenum filter_mode = GL_NEAREST;
  76
  77 void
  78 print_usage_and_exit(char *prog_name)
  79 {
  80         printf("Usage: %s <num_samples> <buffer_type>\n"
  81                "  where <buffer_type> is one of:\n"
  82                "    color\n"
  83                "    stencil\n"
  84                "    depth\n"
  85                "Available options:\n"
  86                "    linear: use GL_LINEAR filter mode\n",
  87                prog_name);
  88         piglit_report_result(PIGLIT_FAIL);
  89 }
  90
  91 void
  92 piglit_init(int argc, char **argv)
  93 {
  94         int num_samples;
  95         if (argc < 3)
  96                 print_usage_and_exit(argv[0]);
  97         {
  98                 char *endptr = NULL;
  99                 num_samples = strtol(argv[1], &endptr, 0);
 100                 if (endptr != argv[1] + strlen(argv[1]))
 101                         print_usage_and_exit(argv[0]);
 102         }
 103
 104         piglit_require_gl_version(21);
 105         piglit_require_extension("GL_ARB_framebuffer_object");
 106         piglit_require_extension("GL_ARB_vertex_array_object");
 107
 108         /* Skip the test if num_samples > GL_MAX_SAMPLES */
 109         GLint max_samples;
 110         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
 111         if (num_samples > max_samples)
 112                 piglit_report_result(PIGLIT_SKIP);
 113
 114         if (strcmp(argv[2], "color") == 0) {
 115                 test_pattern = new Triangles();
 116                 buffer_to_test = GL_COLOR_BUFFER_BIT;
 117         } else if (strcmp(argv[2], "depth") == 0) {
 118                 test_pattern = new DepthSunburst();
 119                 manifest_program = new ManifestDepth();
 120                 buffer_to_test = GL_DEPTH_BUFFER_BIT;
 121         } else if (strcmp(argv[2], "stencil") == 0) {
 122                 test_pattern = new StencilSunburst();
 123                 manifest_program = new ManifestStencil();
 124                 buffer_to_test = GL_STENCIL_BUFFER_BIT;
 125         } else {
 126                 print_usage_and_exit(argv[0]);
 127         }
 128
 129         for (int i = 3; i < argc; i++) {
 130                 if (strcmp(argv[i], "linear") == 0)
 131                         filter_mode = GL_LINEAR;
 132                 else
 133                         print_usage_and_exit(argv[0]);
 134         }
 135
 136         test_pattern->compile();
 137         if (manifest_program)
 138                 manifest_program->compile();
 139
 140         multisample_fbo.setup(FboConfig(num_samples, pattern_width,
 141                                         pattern_height));
 142 }
 143
 144 enum piglit_result
 145 piglit_display()
 146 {
 147         bool pass = true;
 148
 149         /* Draw the full test pattern on the right half of the piglit
 150          * window, as a reference image.
 151          *
 152          * To map the full test pattern to the right half of the
 153          * windows, we need a projection matrix that multiplies the X
 154          * coordinate by 0.5 and adds 0.5.
 155          */
 156         float proj[4][4] = {
 157                 { 0.5, 0, 0, 0.5 },
 158                 { 0,   1, 0, 0   },
 159                 { 0,   0, 1, 0   },
 160                 { 0,   0, 0, 1   }
 161         };
 162         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 163         glViewport(0, 0, piglit_width, piglit_height);
 164         test_pattern->draw(proj);
 165
 166         /* Blit the test pattern to multisample_fbo, forcing the
 167          * implementation to upsample it.
 168          */
 169         glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
 170         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisample_fbo.handle);
 171         glBlitFramebuffer(pattern_width, 0, pattern_width*2, pattern_height,
 172                           0, 0, pattern_width, pattern_height,
 173                           buffer_to_test, filter_mode);
 174
 175         if (manifest_program) {
 176                 /* Manifest the test pattern in the main framebuffer. */
 177                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 178                 manifest_program->run();
 179
 180                 /* Manifest the test pattern in the multisample
 181                  * framebuffer.
 182                  */
 183                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisample_fbo.handle);
 184                 multisample_fbo.set_viewport();
 185                 manifest_program->run();
 186         }
 187
 188         /* Blit the manifested test pattern to the left half of the
 189          * main framebuffer, forcing the implementation to downsample
 190          * it.
 191          */
 192         glBindFramebuffer(GL_READ_FRAMEBUFFER, multisample_fbo.handle);
 193         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 194         glBlitFramebuffer(0, 0, pattern_width, pattern_height,
 195                           0, 0, pattern_width, pattern_height,
 196                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
 197
 198         /* Check that the left and right halves of the screen match.
 199          * If they don't, then there is either a problem with
 200          * upsampling or downsampling.  Since downsampling is already
 201          * tested by accuracy.cpp, we'll assume that any problem we
 202          * see here is due to upsampling.
 203          */
 204         glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
 205         pass = piglit_probe_rect_halves_equal_rgba(0, 0, piglit_width,
 206                                                    piglit_height) && pass;
 207
 208         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 209
 210         piglit_present_results();
 211
 212         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 213 }