tests/spec/arb_shader_image_load_store/bitcast.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 bitcast.c
  25  *
  26  * Test that the reinterpretation of the binary contents of an image
  27  * as a different compatible format yields predictable results as
  28  * specified by the extension.
  29  */
  30
  31 #include "common.h"
  32
  33 /** Window width. */
  34 #define W 16
  35
  36 /** Window height. */
  37 #define H 96
  38
  39 /** Total number of pixels in the window and image. */
  40 #define N (W * H)
  41
  42 PIGLIT_GL_TEST_CONFIG_BEGIN
  43
  44 config.supports_gl_core_version = 32;
  45
  46 config.window_width = W;
  47 config.window_height = H;
  48 config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  49 config.khr_no_error_support = PIGLIT_NO_ERRORS;
  50
  51 PIGLIT_GL_TEST_CONFIG_END
  52
  53 static bool
  54 init_image(const struct image_info img,
  55            const struct image_format_info *dst_format)
  56 {
  57         const unsigned m = image_num_components(img.format);
  58         uint32_t pixels[4 * N];
  59         int i;
  60
  61         for (i = 0; i < m * N; ++i)
  62                 pixels[i] = encode(img.format,
  63                                    get_idx(image_format_scale(img.format), i % m)
  64                                    * i / (m * N));
  65
  66         if (!upload_image(img, 0, pixels))
  67            return false;
  68
  69         glBindImageTexture(0, get_texture(0), 0, GL_TRUE, 0,
  70                            GL_READ_ONLY, dst_format->format);
  71
  72         return piglit_check_gl_error(GL_NO_ERROR);
  73 }
  74
  75 static bool
  76 check(const struct grid_info grid, const struct image_info src_img,
  77       const struct image_info dst_img)
  78 {
  79         uint32_t pixels_fb[4 * N];
  80         uint32_t pixels_img[4 * N];
  81
  82         if (!download_result(grid, pixels_fb))
  83                 return false;
  84
  85         /*
  86          * According to the spec, the reinterpretation of the texture
  87          * data performed by image loads is equivalent to:
  88          *
  89          * "reading the texel from the source format to scratch
  90          *  memory according to the process described for GetTexImage
  91          *  (section 6.1.4), using default pixel storage modes and
  92          *  <format> and <type> parameters corresponding to the source
  93          *  format in Table X.3; and [...]
  94          */
  95         glBindTexture(src_img.target->target, get_texture(0));
  96         glGetTexImage(src_img.target->target, 0, src_img.format->pixel_format,
  97                       src_img.format->pixel_type, pixels_img);
  98
  99         /*
 100          *  [...] writing the texel from scratch memory to the destination
 101          *  format according to the process described for
 102          *  TexSubImage3D (section 3.9.2), using default pixel storage
 103          *  modes and <format> and <type> parameters corresponding to
 104          *  the destination format in Table X.3."
 105          */
 106         glTexImage2D(dst_img.target->target, 0, dst_img.format->format,
 107                      W, H, 0, dst_img.format->pixel_format,
 108                      dst_img.format->pixel_type, pixels_img);
 109         glGetTexImage(dst_img.target->target, 0, grid.format->pixel_format,
 110                       image_base_type(grid.format), pixels_img);
 111
 112         return piglit_check_gl_error(GL_NO_ERROR) &&
 113                 check_pixels_v(dst_img, pixels_fb, pixels_img);
 114 }
 115
 116 static bool
 117 run_test(const struct image_format_info *src_format,
 118          const struct image_format_info *dst_format)
 119 {
 120         const struct grid_info grid =
 121                 grid_info(GL_FRAGMENT_SHADER,
 122                           image_base_internal_format(dst_format), W, H);
 123         const struct image_info src_img =
 124                 image_info(GL_TEXTURE_2D, src_format->format, W, H);
 125         const struct image_info dst_img =
 126                 image_info(GL_TEXTURE_2D, dst_format->format, W, H);
 127         GLuint prog = generate_program(
 128                 grid, GL_FRAGMENT_SHADER,
 129                 concat(image_hunk(dst_img, ""),
 130                        hunk("IMAGE_UNIFORM_T img;\n"
 131                             "\n"
 132                             "GRID_T op(ivec2 idx, GRID_T x) {\n"
 133                             "        return imageLoad(img, IMAGE_ADDR(idx));\n"
 134                             "}\n"), NULL));
 135         bool ret = prog && init_fb(grid) &&
 136                 init_image(src_img, dst_format) &&
 137                 set_uniform_int(prog, "img", 0) &&
 138                 draw_grid(grid, prog) &&
 139                 check(grid, src_img, dst_img);
 140
 141         glDeleteProgram(prog);
 142         return ret;
 143 }
 144
 145 void
 146 piglit_init(int argc, char **argv)
 147 {
 148         const struct image_format_info *src_format, *dst_format;
 149         enum piglit_result status = PIGLIT_PASS;
 150
 151         piglit_require_extension("GL_ARB_shader_image_load_store");
 152
 153         for (src_format = image_formats_load_store;
 154              src_format->name; ++src_format) {
 155                 for (dst_format = image_formats_load_store;
 156                      dst_format->name; ++dst_format) {
 157                         if (dst_format != src_format &&
 158                             image_compat_format(dst_format) ==
 159                             image_compat_format(src_format)) {
 160                                 subtest(&status, true,
 161                                         run_test(src_format, dst_format),
 162                                         "%s to %s bitcast test",
 163                                         src_format->name, dst_format->name);
 164                         }
 165                 }
 166         }
 167
 168         piglit_report_result(status);
 169 }
 170
 171 enum piglit_result
 172 piglit_display(void)
 173 {
 174         return PIGLIT_FAIL;
 175 }