tests/spec/arb_shader_image_load_store/indexing.c

   1 /*
   2  * Copyright (C) 2014 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 indexing.c
  25  *
  26  * Test that image array indexing gives the expected results.  The
  27  * original ARB_shader_image_load_store is rather vague in this
  28  * regard, but the GLSL 4.2 specification states that:
  29  *
  30  * "When aggregated into arrays within a shader, images can only be
  31  *  indexed with a dynamically uniform integral expression, otherwise
  32  *  results are undefined."
  33  *
  34  * Which means that we can only check indexing with dynamically
  35  * uniform expressions, i.e. expressions that are invariant for all
  36  * shader invocations in which they are evaluated.
  37  */
  38
  39 #include "common.h"
  40
  41 /** Window width. */
  42 #define W 16
  43
  44 /** Window height. */
  45 #define H 96
  46
  47 /** Total number of pixels in the window and images. */
  48 #define N (W * H)
  49
  50 PIGLIT_GL_TEST_CONFIG_BEGIN
  51
  52 config.supports_gl_core_version = 32;
  53
  54 config.window_width = W;
  55 config.window_height = H;
  56 config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  57 config.khr_no_error_support = PIGLIT_NO_ERRORS;
  58
  59 PIGLIT_GL_TEST_CONFIG_END
  60
  61 static bool
  62 init_images(const struct image_info img, GLuint prog)
  63 {
  64         uint32_t pixels[H][W];
  65         int i, j, unit;
  66
  67         for (unit = 0; unit < 8; ++unit) {
  68                 char *name = NULL;
  69
  70                 for (i = 0; i < W; ++i)
  71                         for (j = 0; j < H; ++j)
  72                                 pixels[j][i] = (i + j + unit) % 16;
  73
  74                 if (!upload_image(img, unit, pixels[0]))
  75                         return false;
  76
  77                 (void)!asprintf(&name, "imgs[%d]", unit);
  78                 set_uniform_int(prog, name, unit);
  79                 free(name);
  80         }
  81
  82         return true;
  83 }
  84
  85 static bool
  86 check(const struct grid_info grid, unsigned u)
  87 {
  88         uint32_t pixels[H][W];
  89         uint32_t expect[H][W];
  90         int i, j, unit;
  91
  92         for (i = 0; i < W; ++i) {
  93                 for (j = 0; j < H; ++j) {
  94                         if (i % 2 == j % 3) {
  95                                 /* Skipped invocation. */
  96                                 expect[j][i] = 0xdeadcafe;
  97                         } else {
  98                                 /* Active invocation. */
  99                                 unsigned x = 0;
 100
 101                                 for (unit = 0; unit < 8; ++unit)
 102                                         x = (x << 4 |
 103                                              ((i + j + (unit + u) % 8) % 16));
 104
 105                                 expect[j][i] = x;
 106                         }
 107                 }
 108         }
 109
 110         return download_result(grid, pixels[0]) &&
 111                 check_pixels_v(image_info_for_grid(grid),
 112                                pixels[0], expect[0]);
 113 }
 114
 115 /**
 116  * Discard a number of fragments and then load elements from an array
 117  * of images using dynamically uniform indices.
 118  */
 119 static bool
 120 run_test(const struct image_stage_info *stage)
 121 {
 122         const struct grid_info grid =
 123                 grid_info(stage->stage, GL_R32UI, W, H);
 124         const struct image_info img = image_info_for_grid(grid);
 125         GLuint prog = generate_program(
 126                 grid, stage->stage ,
 127                 concat(image_hunk(img, ""),
 128                        hunk("uniform int u;\n"
 129                             "IMAGE_UNIFORM_T imgs[8];\n"
 130                             "\n"
 131                             "GRID_T op(ivec2 idx, GRID_T x) {\n"
 132                             "        int i;\n"
 133                             "\n"
 134                             "        if (idx.x % 2 == idx.y % 3)\n"
 135                             "                return GRID_T(0xdeadcafeu);\n"
 136                             "\n"
 137                             "        for (i = 0; i < 8; ++i) {\n"
 138                             "                x.x = (x.x << 4 |"
 139                             "                       imageLoad(imgs[(i + u) % 8],"
 140                             "                                 IMAGE_ADDR(idx)).x);\n"
 141                             "        }\n"
 142                             "\n"
 143                             "        return x;\n"
 144                             "}\n"), NULL));
 145         bool ret = prog &&
 146                 init_fb(grid) &&
 147                 init_images(img, prog) &&
 148                 set_uniform_int(prog, "u", 5) &&
 149                 draw_grid(grid, prog) &&
 150                 check(grid, 5);
 151
 152         glDeleteProgram(prog);
 153         return ret;
 154 }
 155
 156 void
 157 piglit_init(int argc, char **argv)
 158 {
 159         enum piglit_result status = PIGLIT_PASS;
 160         const struct image_stage_info *stage;
 161
 162         piglit_require_extension("GL_ARB_shader_image_load_store");
 163
 164         for (stage = image_stages(); stage->name; ++stage)
 165                 subtest(&status, true, run_test(stage),
 166                         "%s shader/dynamically uniform indexing test",
 167                         stage->name);
 168
 169         piglit_report_result(status);
 170 }
 171
 172 enum piglit_result
 173 piglit_display(void)
 174 {
 175         return PIGLIT_FAIL;
 176 }