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 #define ftoh(x) (piglit_float_from_half(piglit_half_from_float(x)))
  38
  39 PIGLIT_GL_TEST_CONFIG_BEGIN
  40
  41         piglit_config = &config;
  42         config.subtests = subtests;
  43         config.supports_gl_compat_version = 10;
  44         config.window_width = 20;
  45         config.window_height = 20;
  46         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE;
  47         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  48
  49 PIGLIT_GL_TEST_CONFIG_END
  50
  51 const struct piglit_subtest subtests[] = {
  52         {
  53                 "depth16",
  54                 "depth16",
  55                 test,
  56                 (void *)GL_DEPTH_COMPONENT16
  57         },
  58         {
  59                 "depth24",
  60                 "depth24",
  61                 test,
  62                 (void *)GL_DEPTH_COMPONENT24
  63         },
  64         {
  65                 "depth32",
  66                 "depth32",
  67                 test,
  68                 (void *)GL_DEPTH_COMPONENT32
  69         },
  70         {
  71                 "depth24_stencil8",
  72                 "depth24_stencil8",
  73                 test,
  74                 (void *)GL_DEPTH24_STENCIL8
  75         },
  76         {
  77                 "depth32f",
  78                 "depth32f",
  79                 test,
  80                 (void *)GL_DEPTH_COMPONENT32F
  81         },
  82         {
  83                 "depth32f_stencil8",
  84                 "depth32f_stencil8",
  85                 test,
  86                 (void *)GL_DEPTH32F_STENCIL8
  87         },
  88         {0}};
  89
  90 static GLuint prog;
  91
  92 static const char *vs_source =
  93         "#version 110 \n"
  94         "void main() \n"
  95         "{ \n"
  96         "   gl_Position = gl_Vertex;\n"
  97         "} \n";
  98
  99 static const char *fs_source =
 100         "#version 110 \n"
 101         "uniform float depth;\n"
 102         "void main() \n"
 103         "{ \n"
 104         "    gl_FragColor = vec4(0.0, 1.0, 0.0, 0.0);\n"
 105         "    gl_FragDepth = depth;\n"
 106         "} \n";
 107
 108 /**
 109  * number of iteration must be below than all possible,
 110  * because for big format (like 32bit) if testing every value,
 111  * time of test approaches infinity. iteration_pow controls
 112  * sampling rate, we test 2^iteration_pow number of values,
 113  * independent of format and evenly chosen in all possible values
 114  * for this format
 115  */
 116 static const uint32_t iteration_pow = 8;
 117
 118 uint32_t
 119 depth_num_of_bits(uint32_t depth)
 120 {
 121         switch (depth) {
 122                 case GL_DEPTH_COMPONENT16:      return 16;
 123                 case GL_DEPTH_COMPONENT24:      return 24;
 124                 case GL_DEPTH_COMPONENT32:      return 32;
 125                 case GL_DEPTH24_STENCIL8:       return 24;
 126                 case GL_DEPTH_COMPONENT32F:     return 32;
 127                 case GL_DEPTH32F_STENCIL8:      return 32;
 128                 default:                        return 8;
 129         };
 130 }
 131
 132 bool
 133 check_color(float depth)
 134 {
 135         int depth_location;
 136         static const GLfloat green[] = {0.0, 1.0, 0.0, 1.0};
 137
 138         glClearDepth(depth);
 139         glClearColor(1.0, 0.0, 0.0, 1.0);
 140         glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 141
 142         depth_location = glGetUniformLocation(prog, "depth");
 143         glUniform1f(depth_location, depth);
 144
 145         piglit_draw_rect(-1, -1, 2, 2);
 146
 147         return piglit_probe_pixel_rgb(0, 0, green);
 148 }
 149
 150 enum piglit_result
 151 test(void *data)
 152 {
 153         GLuint fb;
 154         GLuint db, cb;
 155         GLenum depth_format = (long unsigned)data;
 156
 157         GLenum status;
 158
 159         if (depth_format == GL_DEPTH24_STENCIL8)
 160                 if (!piglit_is_extension_supported(
 161                         "GL_EXT_packed_depth_stencil"))
 162                         return PIGLIT_SKIP;
 163
 164         if (depth_format == GL_DEPTH_COMPONENT32F ||
 165             depth_format == GL_DEPTH32F_STENCIL8)
 166                 if (!piglit_is_extension_supported(
 167                         "GL_ARB_depth_buffer_float"))
 168                         return PIGLIT_SKIP;
 169
 170         glUseProgram(prog);
 171
 172         /* Create the FBO. */
 173         glGenRenderbuffers(1, &db);
 174         glBindRenderbuffer(GL_RENDERBUFFER, db);
 175
 176         glRenderbufferStorage(GL_RENDERBUFFER, depth_format,
 177                                 piglit_width, piglit_height);
 178
 179         glGenRenderbuffers(1, &cb);
 180         glBindRenderbuffer(GL_RENDERBUFFER, cb);
 181
 182         glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8,
 183                                 piglit_width, piglit_height);
 184
 185         glBindRenderbuffer(GL_RENDERBUFFER, 0);
 186
 187         glGenFramebuffers(1, &fb);
 188         glBindFramebuffer(GL_FRAMEBUFFER, fb);
 189
 190         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
 191                                 GL_RENDERBUFFER, db);
 192
 193         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
 194                                 GL_RENDERBUFFER, cb);
 195
 196         status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
 197
 198         if (status == GL_FRAMEBUFFER_UNSUPPORTED)
 199                 return PIGLIT_SKIP;
 200
 201         if (status != GL_FRAMEBUFFER_COMPLETE) {
 202                 printf("FBO incomplete status %s\n",
 203                 piglit_get_gl_enum_name(status));
 204                 return PIGLIT_FAIL;
 205         }
 206
 207         bool pass = true;
 208
 209         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fb);
 210         glEnable(GL_DEPTH_TEST);
 211         glDepthFunc(GL_EQUAL);
 212
 213         uint32_t numOfBits = depth_num_of_bits(depth_format);
 214         uint32_t maxStoreableValue = (1l << numOfBits) - 1;
 215         uint32_t step = 1 << (numOfBits - iteration_pow);
 216
 217         for (uint64_t depth = 0; depth < maxStoreableValue; depth += step) {
 218                 float fdepth = depth / (float)maxStoreableValue;
 219
 220                 assert(maxStoreableValue * fdepth == depth);
 221
 222                 if (numOfBits < 32)
 223                         fdepth = ftoh(depth / (float)maxStoreableValue);
 224
 225                 pass = check_color(fdepth);
 226
 227                 if (!pass) {
 228                         printf("Testing format: %s.\n"
 229                                 "Mismatch between value set with "
 230                                 "glClearDepth and set in shader. "
 231                                 "Depth: %f\n",
 232                                 piglit_get_gl_enum_name(depth_format),
 233                                 fdepth);
 234                         break;
 235                 }
 236         }
 237
 238         /* Cleanup. */
 239         glDeleteRenderbuffers(1, &cb);
 240         glDeleteRenderbuffers(1, &db);
 241         glDeleteFramebuffers(1, &fb);
 242
 243         if (!piglit_check_gl_error(GL_NO_ERROR))
 244                 pass = false;
 245
 246         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 247 }
 248
 249 enum piglit_result
 250 piglit_display(void)
 251 {
 252         enum piglit_result pass = PIGLIT_SKIP;
 253         GLuint fs, vs;
 254
 255         vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_source);
 256         fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_source);
 257         prog = piglit_link_simple_program(vs, fs);
 258
 259         pass = piglit_run_selected_subtests(piglit_config->subtests,
 260                                         piglit_config->selected_subtests,
 261                                         piglit_config->num_selected_subtests,
 262                                         pass);
 263
 264         glDeleteProgram(prog);
 265         glDeleteShader(fs);
 266         glDeleteShader(vs);
 267
 268         return pass;
 269 }
 270
 271 void piglit_init(int argc, char **argv)
 272 {
 273         piglit_require_extension("GL_ARB_framebuffer_object");
 274 }