tests/general/depth-clear-precision-check.c

   1 /*
   2  * Copyright (C) 2019, 2020, 2021, 2022 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
  25 /** @file depth-clear-precision-check.c
  26  *
  27  * Tests that glClearDepth store on gpu exactly the transferred values
  28  * with different depth's values and with different depth formats.
  29  */
  30
  31 #include "piglit-util-gl.h"
  32
  33 const struct piglit_subtest subtests[];
  34 enum piglit_result test(void *data);
  35 static struct piglit_gl_test_config *piglit_config;
  36
  37 PIGLIT_GL_TEST_CONFIG_BEGIN
  38
  39         piglit_config = &config;
  40         config.subtests = subtests;
  41         config.supports_gl_compat_version = 10;
  42         config.window_width = 20;
  43         config.window_height = 20;
  44         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE;
  45         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  46
  47 PIGLIT_GL_TEST_CONFIG_END
  48
  49 const struct piglit_subtest subtests[] = {
  50         {
  51                 "depth16",
  52                 "depth16",
  53                 test,
  54                 (void *)GL_DEPTH_COMPONENT16
  55         },
  56         {
  57                 "depth24",
  58                 "depth24",
  59                 test,
  60                 (void *)GL_DEPTH_COMPONENT24
  61         },
  62         {
  63                 "depth32",
  64                 "depth32",
  65                 test,
  66                 (void *)GL_DEPTH_COMPONENT32
  67         },
  68         {
  69                 "depth24_stencil8",
  70                 "depth24_stencil8",
  71                 test,
  72                 (void *)GL_DEPTH24_STENCIL8
  73         },
  74         {
  75                 "depth32f",
  76                 "depth32f",
  77                 test,
  78                 (void *)GL_DEPTH_COMPONENT32F
  79         },
  80         {
  81                 "depth32f_stencil8",
  82                 "depth32f_stencil8",
  83                 test,
  84                 (void *)GL_DEPTH32F_STENCIL8
  85         },
  86         {0}};
  87
  88 static GLuint prog;
  89
  90 static const char *vs_source =
  91         "#version 110 \n"
  92         "void main() \n"
  93         "{ \n"
  94         "   gl_Position = gl_Vertex;\n"
  95         "} \n";
  96
  97 static const char *fs_source =
  98         "#version 110 \n"
  99         "uniform float depth;\n"
 100         "void main() \n"
 101         "{ \n"
 102         "    gl_FragColor = vec4(0.0, 1.0, 0.0, 0.0);\n"
 103         "    gl_FragDepth = depth;\n"
 104         "} \n";
 105
 106 /**
 107  * number of iteration must be below than all possible,
 108  * because for big format (like 32bit) if testing every value,
 109  * time of test approaches infinity. iteration_pow controls
 110  * sampling rate, we test 2^iteration_pow number of values,
 111  * independent of format and evenly chosen in all possible values
 112  * for this format
 113  */
 114 static const uint32_t iteration_pow = 8;
 115
 116 uint32_t
 117 depth_num_of_bits(uint32_t depth)
 118 {
 119         switch (depth) {
 120                 case GL_DEPTH_COMPONENT16:      return 16;
 121                 case GL_DEPTH_COMPONENT24:      return 24;
 122                 case GL_DEPTH_COMPONENT32:      return 32;
 123                 case GL_DEPTH24_STENCIL8:       return 24;
 124                 case GL_DEPTH_COMPONENT32F:     return 32;
 125                 case GL_DEPTH32F_STENCIL8:      return 32;
 126                 default:                        return 8;
 127         };
 128 }
 129
 130 bool
 131 check_color(float depth)
 132 {
 133         int depth_location;
 134         static const GLfloat green[] = {0.0, 1.0, 0.0, 1.0};
 135
 136         glClearDepth(depth);
 137         glClearColor(1.0, 0.0, 0.0, 1.0);
 138         glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 139
 140         depth_location = glGetUniformLocation(prog, "depth");
 141         glUniform1f(depth_location, depth);
 142
 143         piglit_draw_rect(-1, -1, 2, 2);
 144
 145         return piglit_probe_pixel_rgb(0, 0, green);
 146 }
 147
 148 enum piglit_result
 149 test(void *data)
 150 {
 151         GLuint fb;
 152         GLuint db, cb;
 153         GLenum depth_format = (long unsigned)data;
 154
 155         GLenum status;
 156
 157         if (depth_format == GL_DEPTH24_STENCIL8)
 158                 if (!piglit_is_extension_supported(
 159                         "GL_EXT_packed_depth_stencil"))
 160                         return PIGLIT_SKIP;
 161
 162         if (depth_format == GL_DEPTH_COMPONENT32F ||
 163             depth_format == GL_DEPTH32F_STENCIL8)
 164                 if (!piglit_is_extension_supported(
 165                         "GL_ARB_depth_buffer_float"))
 166                         return PIGLIT_SKIP;
 167
 168         glUseProgram(prog);
 169
 170         /* Create the FBO. */
 171         glGenRenderbuffers(1, &db);
 172         glBindRenderbuffer(GL_RENDERBUFFER, db);
 173
 174         glRenderbufferStorage(GL_RENDERBUFFER, depth_format,
 175                                 piglit_width, piglit_height);
 176
 177         glGenRenderbuffers(1, &cb);
 178         glBindRenderbuffer(GL_RENDERBUFFER, cb);
 179
 180         glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8,
 181                                 piglit_width, piglit_height);
 182
 183         glBindRenderbuffer(GL_RENDERBUFFER, 0);
 184
 185         glGenFramebuffers(1, &fb);
 186         glBindFramebuffer(GL_FRAMEBUFFER, fb);
 187
 188         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
 189                                 GL_RENDERBUFFER, db);
 190
 191         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
 192                                 GL_RENDERBUFFER, cb);
 193
 194         status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
 195
 196         if (status == GL_FRAMEBUFFER_UNSUPPORTED)
 197                 return PIGLIT_SKIP;
 198
 199         if (status != GL_FRAMEBUFFER_COMPLETE) {
 200                 printf("FBO incomplete status %s\n",
 201                 piglit_get_gl_enum_name(status));
 202                 return PIGLIT_FAIL;
 203         }
 204
 205         bool pass = true;
 206
 207         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fb);
 208         glEnable(GL_DEPTH_TEST);
 209         glDepthFunc(GL_EQUAL);
 210
 211         uint32_t numOfBits = depth_num_of_bits(depth_format);
 212         uint32_t maxStoreableValue = (1l << numOfBits) - 1;
 213         uint32_t step = 1 << (numOfBits - iteration_pow);
 214
 215         for (uint64_t depth = 0; depth < maxStoreableValue; depth += step) {
 216                 float fdepth = depth / (float)maxStoreableValue;
 217
 218                 assert(maxStoreableValue * fdepth == depth);
 219
 220                 pass = check_color(fdepth);
 221
 222                 if (!pass) {
 223                         printf("Testing format: %s.\n"
 224                                 "Mismatch between value set with "
 225                                 "glClearDepth and set in shader. "
 226                                 "Depth: %f\n",
 227                                 piglit_get_gl_enum_name(depth_format),
 228                                 fdepth);
 229                         break;
 230                 }
 231         }
 232
 233         /* Cleanup. */
 234         glDeleteRenderbuffers(1, &cb);
 235         glDeleteRenderbuffers(1, &db);
 236         glDeleteFramebuffers(1, &fb);
 237
 238         if (!piglit_check_gl_error(GL_NO_ERROR))
 239                 pass = false;
 240
 241         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 242 }
 243
 244 enum piglit_result
 245 piglit_display(void)
 246 {
 247         enum piglit_result pass = PIGLIT_SKIP;
 248         GLuint fs, vs;
 249
 250         vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_source);
 251         fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_source);
 252         prog = piglit_link_simple_program(vs, fs);
 253
 254         pass = piglit_run_selected_subtests(piglit_config->subtests,
 255                                         piglit_config->selected_subtests,
 256                                         piglit_config->num_selected_subtests,
 257                                         pass);
 258
 259         glDeleteProgram(prog);
 260         glDeleteShader(fs);
 261         glDeleteShader(vs);
 262
 263         return pass;
 264 }
 265
 266 void piglit_init(int argc, char **argv)
 267 {
 268         piglit_require_extension("GL_ARB_framebuffer_object");
 269 }