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

   1 /*
   2  * Copyright © 2013 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
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   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
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  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,
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  21  * IN THE SOFTWARE.
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  23
  24 /** \file builtin-gl-sample-mask.cpp
  25  *  This test verifies that supplying a value to gl_SampleMask[]
  26  *  in fragment shader program works as per ARB_sample_shading
  27  *  specification.
  28  **/
  29
  30 #include "piglit-fbo.h"
  31 using namespace piglit_util_fbo;
  32
  33 const int pattern_width = 128; const int pattern_height = 128;
  34
  35 PIGLIT_GL_TEST_CONFIG_BEGIN
  36
  37         config.supports_gl_compat_version = 21;
  38         config.supports_gl_core_version = 31;
  39
  40         config.window_width = pattern_width;
  41         config.window_height = pattern_height;
  42         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  43         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  44
  45 PIGLIT_GL_TEST_CONFIG_END
  46
  47 static int  num_samples;
  48 static unsigned prog_0, prog_1;
  49 static Fbo multisampled_fbo, multisampled_tex;
  50
  51 static void
  52 print_usage_and_exit(char *prog_name)
  53 {
  54         printf("Usage: %s <num_samples>\n", prog_name);
  55         piglit_report_result(PIGLIT_FAIL);
  56 }
  57
  58 void
  59 compile_shader(void)
  60 {
  61         static const char *vert =
  62                 "#version 130\n"
  63                 "in vec4 piglit_vertex;\n"
  64                 "void main()\n"
  65                 "{\n"
  66                 "  gl_Position = piglit_vertex;\n"
  67                 "}\n";
  68         static const char *frag_0 =
  69                 "#version 130\n"
  70                 "#extension GL_ARB_sample_shading : enable\n"
  71                 "out vec4 out_color;\n"
  72                 "void main()\n"
  73                 "{\n"
  74                    /* For 128x128 image size, below formula produces a bit
  75                     * pattern where no two bits of gl_SampleMask[0] are
  76                     * correlated.
  77                     */
  78                 "  gl_SampleMask[0] = (int(gl_FragCoord.x) * 0x10204081) ^\n"
  79                 "                     (int(gl_FragCoord.y) * 0x01010101);\n"
  80                 "  out_color = vec4(0.0, 1.0, 0.0, 1.0);\n"
  81                 "}\n";
  82
  83         static const char *frag_template =
  84                 "#version 130\n"
  85                 "%s\n"
  86                 "uniform %s tex;\n"
  87                 "uniform int samples;\n"
  88                 "out vec4 out_color;\n"
  89                 "void main()\n"
  90                 "{\n"
  91                 "  int i = 0;\n"
  92                 "  bool pass = true;\n"
  93                 "  int mask = (int(gl_FragCoord.x) * 0x10204081) ^\n"
  94                 "             (int(gl_FragCoord.y) * 0x01010101);\n"
  95                 "  vec4 green = vec4(0.0, 1.0, 0.0, 1.0);\n"
  96                 "  vec4 black = vec4(0.0, 0.0, 0.0, 0.0);\n"
  97                 "  if (samples == 0) mask = 1;\n"
  98                    /* Use do-while to include 'samples = 0' case. */
  99                 "  do {\n"
 100                 "    bool is_sample_mask_set = ((mask >> i) & 0x1) == 0x1;\n"
 101                 "    vec4 sample_color =\n"
 102                 "      texelFetch(tex, ivec2(gl_FragCoord.xy)%s);\n"
 103                 "\n"
 104                 "    if ((is_sample_mask_set && sample_color != green) ||\n"
 105                 "        (!is_sample_mask_set && sample_color != black)) {\n"
 106                 "      pass = false;\n"
 107                 "      break;\n"
 108                 "    }\n"
 109                 "    i++;\n"
 110                 "  } while (i < samples);\n"
 111                 "\n"
 112                 "  if (pass)\n"
 113                 "    out_color = vec4(0.0, 1.0, 0.0, 1.0);\n"
 114                 "  else\n"
 115                 "    out_color = vec4(1.0, 0.0, 0.0, 1.0);\n"
 116                 "}\n";
 117
 118         /* Compile program */
 119         prog_0 = piglit_build_simple_program(vert, frag_0);
 120         if (!piglit_link_check_status(prog_0)) {
 121                 piglit_report_result(PIGLIT_FAIL);
 122         }
 123
 124         char *frag_1;
 125         if (num_samples)
 126                 (void)!asprintf(&frag_1, frag_template,
 127                          "#extension GL_ARB_texture_multisample : require",
 128                          "sampler2DMS", ", i");
 129         else
 130                 (void)!asprintf(&frag_1, frag_template, "", "sampler2DRect", "");
 131
 132         prog_1 = piglit_build_simple_program(vert, frag_1);
 133         free(frag_1);
 134         if (!piglit_link_check_status(prog_1)) {
 135                 piglit_report_result(PIGLIT_FAIL);
 136         }
 137 }
 138
 139 void
 140 piglit_init(int argc, char **argv)
 141 {
 142         if (argc != 2)
 143                 print_usage_and_exit(argv[0]);
 144
 145         /* 1st arg: num_samples */
 146         char *endptr = NULL;
 147         num_samples = strtol(argv[1], &endptr, 0);
 148         if (endptr != argv[1] + strlen(argv[1]))
 149                 print_usage_and_exit(argv[0]);
 150
 151         piglit_require_extension("GL_ARB_texture_multisample");
 152         piglit_require_extension("GL_ARB_sample_shading");
 153         piglit_require_GLSL_version(130);
 154
 155         /* Skip the test if num_samples > GL_MAX_SAMPLES */
 156         GLint max_samples;
 157         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
 158         if (num_samples > max_samples)
 159                 piglit_report_result(PIGLIT_SKIP);
 160
 161         FboConfig msConfig(num_samples, pattern_width, pattern_height);
 162         multisampled_fbo.setup(msConfig);
 163         msConfig.num_tex_attachments = 1;
 164         msConfig.num_rb_attachments = 0;
 165         multisampled_tex.setup(msConfig);
 166
 167         compile_shader();
 168         if (!piglit_check_gl_error(GL_NO_ERROR)) {
 169                 piglit_report_result(PIGLIT_FAIL);
 170         }
 171 }
 172
 173 bool
 174 test_builtin_sample_mask(const Fbo& ms_fbo)
 175 {
 176         int samples;
 177         bool result = true;
 178         float expected[4] = {0.0, 1.0, 0.0, 1.0};
 179
 180         glUseProgram(prog_0);
 181         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo.handle);
 182         glGetIntegerv(GL_SAMPLES, &samples);
 183         glClear(GL_COLOR_BUFFER_BIT);
 184         glUniform1i(glGetUniformLocation(prog_0, "samples"), samples);
 185         piglit_draw_rect(-1, -1, 2, 2);
 186
 187         if(ms_fbo.config.num_tex_attachments == 0) {
 188                 /* Blit the framebuffer with multisample renderbuffer attachment
 189                  * into the framebuffer with multisample texture attachment.
 190                  */
 191                 glBindFramebuffer(GL_READ_FRAMEBUFFER, ms_fbo.handle);
 192                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_tex.handle);
 193                 glClear(GL_COLOR_BUFFER_BIT);
 194                 glBlitFramebuffer(0, 0,
 195                                   ms_fbo.config.width,
 196                                   ms_fbo.config.height,
 197                                   0, 0,
 198                                   ms_fbo.config.width,
 199                                   ms_fbo.config.height,
 200                                   GL_COLOR_BUFFER_BIT, GL_NEAREST);
 201         }
 202
 203         glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_tex.handle);
 204         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 205         glClear(GL_COLOR_BUFFER_BIT);
 206
 207         glUseProgram(prog_1);
 208         glUniform1i(glGetUniformLocation(prog_1, "tex"), 0);
 209         glUniform1i(glGetUniformLocation(prog_1, "samples"), samples);
 210         piglit_draw_rect(-1, -1, 2, 2);
 211
 212         glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
 213         result = piglit_probe_rect_rgba(0, 0, pattern_width,
 214                                         pattern_width, expected)
 215                  && result;
 216         piglit_present_results();
 217         printf("FBO attachment = %s, result = %s\n",
 218                ms_fbo.config.num_tex_attachments > 0 ?
 219                "TEXTURE" :
 220                "RENDERBUFFER",
 221                result ? "pass" : "fail");
 222         return result;
 223 }
 224
 225 enum piglit_result
 226 piglit_display()
 227 {
 228         bool pass = true;
 229         pass = test_builtin_sample_mask(multisampled_tex) && pass;
 230         pass = test_builtin_sample_mask(multisampled_fbo) && pass;
 231         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 232 }