tests/spec/arb_sample_shading/execution/builtin-gl-sample-mask-mrt-alpha-to-coverage-combinations.cpp

   1 /*
   2  * Copyright © 2019 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  * \file builtin-gl-sample-mask-mrt-alpha-to-coverage-combinations.cpp
  25  *
  26  * Test verifies correct work of alpha-to-coverage with every variation of
  27  * sample mask, all levels of MSAA and different number of render targets.
  28  *
  29  * \author Andrii Kryvytskyi <andrii.o.kryvytskyi@globallogic.com>
  30  */
  31
  32 #include "piglit-fbo.h"
  33 using namespace piglit_util_fbo;
  34 PIGLIT_GL_TEST_CONFIG_BEGIN
  35
  36         config.supports_gl_core_version = 40;
  37
  38         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  39         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  40
  41         /* 4 possible alphas and 2^16 possible sample masks */
  42         config.window_height = 512;
  43         config.window_width = 512;
  44
  45 PIGLIT_GL_TEST_CONFIG_END
  46
  47 static Fbo
  48 make_fbo(int tex_attachments_num, int samples_num)
  49 {
  50         FboConfig config(samples_num, piglit_width, piglit_height);
  51         config.num_rb_attachments = 0;
  52
  53         config.num_tex_attachments = tex_attachments_num;
  54
  55         for (int i = 0; i < tex_attachments_num; i++)
  56                 config.tex_attachment[i] = GL_COLOR_ATTACHMENT0 + i;
  57
  58         Fbo fbo;
  59         fbo.setup(config);
  60
  61         if (!piglit_check_gl_error(GL_NO_ERROR))
  62                 piglit_report_result(PIGLIT_FAIL);
  63
  64         return fbo;
  65 }
  66
  67 static GLuint test_prog;
  68 static GLuint check_prog;
  69 static GLint max_samples_num;
  70 static GLint max_attachments_num;
  71
  72 static bool should_all_be_checked;
  73 static int num_samples_to_check;
  74 static int num_render_targets_to_check;
  75
  76 static const char *test_vs =
  77         "#version 130\n"
  78         "in vec4 piglit_vertex;\n"
  79         "\n"
  80         "void main()\n"
  81         "{\n"
  82         "    gl_Position = piglit_vertex;\n"
  83         "}\n";
  84
  85 static const char *test_fs =
  86         "#version 400\n"
  87         "#extension GL_ARB_sample_shading : enable\n"
  88         "\n"
  89         "layout(pixel_center_integer) in vec4 gl_FragCoord;\n"
  90         "uniform int render_targets;\n"
  91         "uniform int samples_num;\n"
  92         "uniform int screen_width;\n"
  93         "out vec4 out_color[gl_MaxDrawBuffers];\n"
  94         "\n"
  95         "void main()\n"
  96         "{\n"
  97         "\n"
  98         "    float fragment_index = gl_FragCoord.x +"
  99         "        gl_FragCoord.y * screen_width;\n"
 100         "       int sample_permutations = int(exp2(samples_num));\n"
 101         "\n"
 102         "    vec4 color = vec4(\n"
 103         "                        mod(gl_FragCoord.x, 2),\n"
 104         "                        mod(gl_FragCoord.y, 2),\n"
 105         "                        mod(fragment_index, 2),\n"
 106         "                        mod(gl_FragCoord.x, 4) - 1\n"
 107         "                 );\n"
 108         "\n"
 109         "    gl_SampleMask[0] = int(mod("
 110         "                        fragment_index / 4,"
 111         "                        sample_permutations)"
 112         "                       );\n"
 113         "\n"
 114         "    out_color[0] = color;\n"
 115         "    for (int i = 1; i < render_targets; i++) {\n"
 116         "    color = vec4(\n"
 117         "                mod(gl_FragCoord.y, 2),\n"
 118         "                mod(fragment_index, 2),\n"
 119         "                mod(gl_FragCoord.x, 2),\n"
 120         "                0.0\n"
 121         "            );\n"
 122         "\n"
 123         "    out_color[i] = color;\n"
 124         "    }\n"
 125         "}\n";
 126
 127 static const char *check_vs =
 128         "#version 130\n"
 129         "in vec4 piglit_vertex;\n"
 130         "\n"
 131         "void main()\n"
 132         "{\n"
 133         "    gl_Position = piglit_vertex;\n"
 134         "}\n";
 135
 136 static const char *check_fs =
 137         "#version 400\n"
 138         "#extension GL_ARB_texture_multisample : require\n"
 139         "\n"
 140         "layout(pixel_center_integer) in vec4 gl_FragCoord;\n"
 141         "uniform int screen_width;\n"
 142         "uniform int screen_height;\n"
 143         "uniform int samples_num;\n"
 144         "uniform int render_target;\n"
 145         "uniform sampler2DMS tex;\n"
 146         "\n"
 147         "out vec4 out_color;\n"
 148         "\n"
 149         "vec4 get_expected_color()\n"
 150         "{\n"
 151         "    float fragment_index = gl_FragCoord.x +"
 152         "                            gl_FragCoord.y * screen_width;\n"
 153         "    vec4 expected = vec4(0.0);\n"
 154         "    float alpha = clamp(mod(gl_FragCoord.x, 4) - 1, 0, 1);\n"
 155         "\n"
 156         "    if (alpha == 0.0f) {\n"
 157         "    expected = vec4(0.0);\n"
 158         "    } else if (render_target == 0) {\n"
 159         "    expected = vec4(\n"
 160         "                    mod(gl_FragCoord.x, 2),\n"
 161         "                    mod(gl_FragCoord.y, 2),\n"
 162         "                    mod(fragment_index, 2),\n"
 163         "                    alpha\n"
 164         "               );\n"
 165         "    } else {\n"
 166         "    expected = vec4(\n"
 167         "                    mod(gl_FragCoord.y, 2),\n"
 168         "                    mod(fragment_index, 2),\n"
 169         "                    mod(gl_FragCoord.x, 2),\n"
 170         "                    0.0\n"
 171         "               );\n"
 172         "    }\n"
 173         "\n"
 174         "    return expected;\n"
 175         "}\n"
 176         "\n"
 177         "void main()\n"
 178         "{\n"
 179         "    vec4 expected = get_expected_color();\n"
 180         "    bool pass = true;\n"
 181         "\n"
 182         "    int fragment_index = int(gl_FragCoord.x +"
 183         "                            gl_FragCoord.y * screen_width);\n"
 184         "    int sample_permutations = int(exp2(samples_num));\n"
 185         "    int sample_mask = int(mod("
 186         "                        fragment_index / 4,"
 187         "                        sample_permutations)"
 188         "                      );\n"
 189         "\n"
 190         "    for (int i = 0; i < samples_num; i++) {\n"
 191         "    ivec2 texelToFetch = ivec2(gl_FragCoord.x, gl_FragCoord.y);\n"
 192         "    vec4 currentColor = texelFetch(tex, texelToFetch, i);\n"
 193         "\n"
 194         "    if ((sample_mask & (1 << i)) != 0)\n"
 195         "        pass = pass && (expected == currentColor);\n"
 196         "    else\n"
 197         "        pass = pass && (vec4(0.0) == currentColor);"
 198         "    }\n"
 199         "\n"
 200         "    if (pass)\n"
 201         "        out_color = vec4(0.0f, 1.0f, 0.0f, 1.0f);\n"
 202         "    else\n"
 203         "        out_color = vec4(1.0f, 0.0f, 0.0f, 1.0f);\n"
 204         "}\n";
 205
 206 /**
 207  * Render to all specified texture attachments of the multisample fbo
 208  * enabling alpha-to-coverage to make the implementation pass the additional
 209  * alpha component from the first attachment when rendering into the
 210  * second. Alpha value is being counted using current fragment coordinates
 211  * to cover more possible variations of sample mask and alpha.
 212  * The resulting sample mask will still be such as specified in
 213  * the fragment shader because an alpha value of 1.0 maps to the
 214  * coverage mask ~0.
 215  */
 216 static bool
 217 run_test(Fbo &fbo, int render_targets, int samples_num)
 218 {
 219         glUseProgram(test_prog);
 220         glUniform1i(glGetUniformLocation(test_prog, "render_targets"),
 221                 render_targets);
 222         glUniform1i(glGetUniformLocation(test_prog, "samples_num"),
 223                 samples_num);
 224         glUniform1i(glGetUniformLocation(test_prog, "screen_width"),
 225                 piglit_width);
 226
 227         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo.handle);
 228         glDrawBuffers(fbo.config.num_tex_attachments,
 229                 fbo.config.tex_attachment);
 230
 231         glEnable(GL_SAMPLE_ALPHA_TO_COVERAGE);
 232         fbo.set_viewport();
 233
 234         glClear(GL_COLOR_BUFFER_BIT);
 235         piglit_draw_rect(-1, -1, 2, 2);
 236
 237         glDisable(GL_SAMPLE_ALPHA_TO_COVERAGE);
 238
 239         return piglit_check_gl_error(GL_NO_ERROR);
 240 }
 241
 242 /**
 243  * Resolve the green component of each sample in case all checks are
 244  * done and equal to expected values.
 245  */
 246 static bool
 247 check(const Fbo &fbo, unsigned render_target,
 248         int render_targets_num, int samples_num)
 249 {
 250         bool pass = true;
 251         const float expected[] = { 0.0f, 1.0f, 0.0f, 1.0f };
 252
 253         glUseProgram(check_prog);
 254         glUniform1i(glGetUniformLocation(check_prog, "tex"), 0);
 255         glUniform1i(glGetUniformLocation(check_prog, "samples_num"),
 256                 samples_num);
 257         glUniform1i(glGetUniformLocation(check_prog, "screen_width"),
 258                 piglit_width);
 259         glUniform1i(glGetUniformLocation(check_prog, "screen_height"),
 260                 piglit_height);
 261         glUniform1i(glGetUniformLocation(check_prog, "render_target"),
 262                 render_target);
 263
 264         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 265         glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, fbo.color_tex[render_target]);
 266         glViewport(0, 0, piglit_width, piglit_height);
 267
 268         glClear(GL_COLOR_BUFFER_BIT);
 269         piglit_draw_rect(-1, -1, 2, 2);
 270
 271         pass &= piglit_check_gl_error(GL_NO_ERROR);
 272         pass &= piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height,
 273                         expected);
 274
 275         if (!pass)
 276                 printf("Test failed with %d samples, %d render targets, "
 277                         "%d render target.\n",
 278                         samples_num, render_targets_num, render_target);
 279
 280         piglit_present_results();
 281
 282         return pass;
 283 }
 284
 285 static bool
 286 run_check(int samples_num, int render_targets_num)
 287 {
 288         bool pass = true;
 289
 290         Fbo fbo = make_fbo(render_targets_num, samples_num);
 291
 292         pass &= run_test(fbo, render_targets_num, samples_num);
 293
 294         for (int render_target_to_check = render_targets_num - 1;
 295                         render_target_to_check >= 0; render_target_to_check--) {
 296                 pass &= check(fbo, render_target_to_check, render_targets_num,
 297                         samples_num);
 298         }
 299
 300         return pass;
 301 }
 302
 303 static void
 304 print_usage_and_exit(char *prog_name)
 305 {
 306         printf("%s Should be used without arguments or with: <samples_num>"
 307                 " <render_targets_num>\n",
 308                 prog_name);
 309
 310         piglit_report_result(PIGLIT_FAIL);
 311 }
 312
 313 void delete_programs()
 314 {
 315         glDeleteProgram(test_prog);
 316         glDeleteProgram(check_prog);
 317 }
 318
 319 void
 320 piglit_init(int argc, char **argv)
 321 {
 322         piglit_require_extension("GL_ARB_texture_multisample");
 323         piglit_require_extension("GL_ARB_sample_shading");
 324
 325         glGetIntegerv(GL_MAX_SAMPLES, &max_samples_num);
 326         glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_attachments_num);
 327
 328         /* 32 will have too many permutations */
 329         max_samples_num = max_samples_num > 16 ? 16 : max_samples_num;
 330
 331         if (argc == 1) {
 332                 should_all_be_checked = true;
 333         } else if (argc == 3) {
 334                 should_all_be_checked = false;
 335
 336                 /* arg1 - samples_num */
 337                 char *end_ptr = NULL;
 338                 num_samples_to_check = strtol(argv[1], &end_ptr, 0);
 339                 if (end_ptr != argv[1] + strlen(argv[1]))
 340                         print_usage_and_exit(argv[0]);
 341
 342                 /* arg2 - render_targets_num */
 343                 end_ptr = NULL;
 344                 num_render_targets_to_check = strtol(argv[2], &end_ptr, 0);
 345                 if (end_ptr != argv[2] + strlen(argv[2]))
 346                         print_usage_and_exit(argv[0]);
 347
 348                 if (num_samples_to_check > max_samples_num ||
 349                         num_render_targets_to_check > max_attachments_num) {
 350                         printf("Error max supported samples = %d, max supported "
 351                                 "color attachments = %d \n",
 352                                 max_samples_num, max_attachments_num);
 353                         piglit_report_result(PIGLIT_FAIL);
 354                 }
 355         } else {
 356                 print_usage_and_exit(argv[0]);
 357         }
 358
 359         test_prog = piglit_build_simple_program(test_vs, test_fs);
 360         check_prog = piglit_build_simple_program(check_vs, check_fs);
 361
 362         atexit(delete_programs);
 363 }
 364
 365 piglit_result
 366 piglit_display()
 367 {
 368         bool pass = true;
 369
 370         if (should_all_be_checked) {
 371                 for (int samples_num = 1; samples_num <= max_samples_num;
 372                         samples_num *= 2) {
 373                         pass &= run_check(samples_num, 1) &&
 374                                         run_check(samples_num, 2) &&
 375                                         run_check(samples_num, max_attachments_num);
 376                 }
 377         } else {
 378                 pass &= run_check(num_samples_to_check, num_render_targets_to_check);
 379         }
 380
 381         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 382 }