tests/spec/arb_sample_shading/execution/builtin-gl-sample-mask-simple.cpp

   1 /*
   2  * Copyright © 2013 Intel Corporation
   3  * Copyright © 2014 Advanced Micro Devices, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  */
  24
  25 /** \file builtin-gl-sample-mask-simple.cpp
  26  *  This test verifies that supplying a value to gl_SampleMask[]
  27  *  in fragment shader program works as per ARB_sample_shading
  28  *  specification.
  29  **/
  30
  31 #include "piglit-fbo.h"
  32 using namespace piglit_util_fbo;
  33
  34 PIGLIT_GL_TEST_CONFIG_BEGIN
  35
  36         config.supports_gl_compat_version = 21;
  37         config.supports_gl_core_version = 31;
  38
  39         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  40         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  41
  42 PIGLIT_GL_TEST_CONFIG_END
  43
  44 static int  num_samples;
  45 static unsigned prog_0, prog_1;
  46 static Fbo multisampled_tex;
  47
  48 static void
  49 print_usage_and_exit(char *prog_name)
  50 {
  51         printf("Usage: %s <num_samples>\n", prog_name);
  52         piglit_report_result(PIGLIT_FAIL);
  53 }
  54
  55 static void
  56 compile_shader(void)
  57 {
  58         static const char *vert =
  59                 "#version 130\n"
  60                 "in vec4 piglit_vertex;\n"
  61                 "void main()\n"
  62                 "{\n"
  63                 "  gl_Position = piglit_vertex;\n"
  64                 "}\n";
  65         static const char *frag_0 =
  66                 "#version 130\n"
  67                 "#extension GL_ARB_sample_shading : enable\n"
  68                 "out vec4 out_color;\n"
  69                 "void main()\n"
  70                 "{\n"
  71                 "  gl_SampleMask[0] = int(gl_FragCoord.x);\n"
  72                 "  out_color = vec4(1.0, 0.0, 0.0, 0.0);\n"
  73                 "}\n";
  74
  75         static const char *frag_template =
  76                 "#version 130 \n"
  77                 "%s \n"
  78                 "uniform %s tex; \n"
  79                 "#define fetch(i) (texelFetch(tex, ivec2(int(gl_FragCoord.y/8) * 16 + int(gl_FragCoord.x/8) % 16, 0)%s)) \n"
  80                 "uniform int samples; \n"
  81                 "out vec4 out_color; \n"
  82                 "void main() \n"
  83                 "{ \n"
  84                 "  vec4 outv = vec4(0.0, 0.0, 0.0, 0.0); \n"
  85                 /* encode the sample mask to RGBA */
  86                 "  outv.x += fetch(0).x * 0.6; \n"
  87                 "  if (1 < samples) outv.y += fetch(1).x * 0.6; \n"
  88                 "  if (2 < samples) outv.z += fetch(2).x * 0.6; \n"
  89                 "  if (3 < samples) outv.w += fetch(3).x * 0.6; \n"
  90                 "  if (4 < samples) outv.x += fetch(4).x * 0.4; \n"
  91                 "  if (5 < samples) outv.y += fetch(5).x * 0.4; \n"
  92                 "  if (6 < samples) outv.z += fetch(6).x * 0.4; \n"
  93                 "  if (7 < samples) outv.w += fetch(7).x * 0.4; \n"
  94                 "  out_color = outv;\n"
  95                 "} \n";
  96
  97         /* Compile program */
  98         prog_0 = piglit_build_simple_program(vert, frag_0);
  99         if (!piglit_link_check_status(prog_0)) {
 100                 piglit_report_result(PIGLIT_FAIL);
 101         }
 102
 103         char *frag_1;
 104         if (num_samples)
 105                 (void)!asprintf(&frag_1, frag_template,
 106                          "#extension GL_ARB_texture_multisample : require",
 107                          "sampler2DMS", ", i");
 108         else
 109                 (void)!asprintf(&frag_1, frag_template, "", "sampler2DRect", "");
 110
 111         prog_1 = piglit_build_simple_program(vert, frag_1);
 112         free(frag_1);
 113         if (!piglit_link_check_status(prog_1)) {
 114                 piglit_report_result(PIGLIT_FAIL);
 115         }
 116 }
 117
 118 void
 119 piglit_init(int argc, char **argv)
 120 {
 121         if (argc != 2)
 122                 print_usage_and_exit(argv[0]);
 123
 124         /* 1st arg: num_samples */
 125         char *endptr = NULL;
 126         num_samples = strtol(argv[1], &endptr, 0);
 127         if (endptr != argv[1] + strlen(argv[1]))
 128                 print_usage_and_exit(argv[0]);
 129
 130         if (num_samples > 8) {
 131                 puts("This test only supports 8 samples.");
 132                 piglit_report_result(PIGLIT_SKIP);
 133         }
 134
 135         piglit_require_extension("GL_ARB_texture_multisample");
 136         piglit_require_extension("GL_ARB_sample_shading");
 137         piglit_require_GLSL_version(130);
 138
 139         /* Skip the test if num_samples > GL_MAX_SAMPLES */
 140         GLint max_samples;
 141         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
 142         if (num_samples > max_samples)
 143                 piglit_report_result(PIGLIT_SKIP);
 144
 145         FboConfig msConfig(num_samples, 1 << MAX2(num_samples, 1), 1);
 146         msConfig.num_rb_attachments = 0;
 147         msConfig.num_tex_attachments = 1;
 148         multisampled_tex.setup(msConfig);
 149
 150         compile_shader();
 151         if (!piglit_check_gl_error(GL_NO_ERROR)) {
 152                 piglit_report_result(PIGLIT_FAIL);
 153         }
 154 }
 155
 156 static bool
 157 equal(float a, float b)
 158 {
 159         return fabs(a - b) < piglit_tolerance[0];
 160 }
 161
 162 enum piglit_result
 163 piglit_display()
 164 {
 165         bool pass = true;
 166         int samples, i, j;
 167
 168         glUseProgram(prog_0);
 169         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_tex.handle);
 170         multisampled_tex.set_viewport();
 171         glGetIntegerv(GL_SAMPLES, &samples);
 172         samples = MAX2(samples, 1);
 173
 174         glClear(GL_COLOR_BUFFER_BIT);
 175         glUniform1i(glGetUniformLocation(prog_0, "samples"), samples);
 176         piglit_draw_rect(-1, -1, 2, 2);
 177
 178         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 179         glViewport(0, 0, piglit_width, piglit_height);
 180         glClear(GL_COLOR_BUFFER_BIT);
 181
 182         glUseProgram(prog_1);
 183         glUniform1i(glGetUniformLocation(prog_1, "tex"), 0);
 184         glUniform1i(glGetUniformLocation(prog_1, "samples"), samples);
 185         if (samples <= 4)
 186                 piglit_draw_rect(-1, -1,
 187                                  8*(1 << samples) * (2.0/piglit_width),
 188                                  8 * (2.0/piglit_height));
 189         else if (samples == 8)
 190                 piglit_draw_rect(-1, -1,
 191                                  8*16 * (2.0/piglit_width),
 192                                  8*16 * (2.0/piglit_height));
 193         else
 194                 assert(0 && "Unimplemented");
 195
 196         for (i = 0; i < multisampled_tex.config.width; i++) {
 197                 float color[4];
 198                 unsigned full_mask = (1 << samples) - 1;
 199                 unsigned expected_mask = i & full_mask;
 200                 unsigned observed_mask = 0;
 201
 202                 if (multisampled_tex.config.num_samples == 0)
 203                         expected_mask = full_mask;
 204
 205                 glReadPixels((i % 16) * 8 + 4,
 206                              (i / 16) * 8 + 4,
 207                              1, 1, GL_RGBA, GL_FLOAT, color);
 208
 209                 for (j = 0; j < 4; j++) {
 210                         if (equal(color[j], 1) || equal(color[j], 0.6))
 211                                 observed_mask |= 1 << (j + 0);
 212                         if (equal(color[j], 1) || equal(color[j], 0.4))
 213                                 observed_mask |= 1 << (j + 4);
 214                 }
 215
 216                 if (expected_mask != observed_mask) {
 217                         printf("Test failed, samples = %u\n"
 218                                "  Expected sample mask: 0x%x\n"
 219                                "  Observed sample mask: 0x%x\n",
 220                                samples, expected_mask, observed_mask);
 221                         pass = false;
 222                 }
 223         }
 224
 225         piglit_present_results();
 226         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 227 }