tests/spec/arb_sample_shading/execution/builtin-gl-num-samples.cpp

   1 /*
   2  * Copyright © 2013 Intel Corporation
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   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:
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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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  23
  24 /** \file builtin-gl-num-samples.cpp
  25  *  This test verifies that using gl_NumSamples in fragment shader
  26  *  program works as per ARB_sample_shading specification.
  27  *
  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;
  49 static Fbo multisampled_fbo, singlesampled_fbo;
  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 =
  69                 "#version 130\n"
  70                 "#extension GL_ARB_sample_shading : require\n"
  71                 "uniform int samples;\n"
  72                 "out vec4 out_color;\n"
  73                 "void main()\n"
  74                 "{\n"
  75                 "  if (gl_NumSamples == samples)\n"
  76                 "    out_color = vec4(0.0, 1.0, 0.0, 1.0);\n"
  77                 "  else\n"
  78                 "    out_color = vec4(1.0, 0.0, 0.0, 1.0);\n"
  79                 "}\n";
  80         /* Compile program */
  81         prog = piglit_build_simple_program(vert, frag);
  82         if (!piglit_link_check_status(prog)) {
  83                 piglit_report_result(PIGLIT_FAIL);
  84         }
  85 }
  86
  87 void
  88 piglit_init(int argc, char **argv)
  89 {
  90         if (argc != 2)
  91                 print_usage_and_exit(argv[0]);
  92
  93         /* 1st arg: num_samples */
  94         char *endptr = NULL;
  95         num_samples = strtol(argv[1], &endptr, 0);
  96         if (endptr != argv[1] + strlen(argv[1]))
  97                 print_usage_and_exit(argv[0]);
  98
  99         piglit_require_extension("GL_ARB_vertex_array_object");
 100         piglit_require_extension("GL_ARB_sample_shading");
 101         piglit_require_GLSL_version(130);
 102
 103         /* Skip the test if num_samples > GL_MAX_SAMPLES */
 104         GLint max_samples;
 105         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
 106         if (num_samples > max_samples)
 107                 piglit_report_result(PIGLIT_SKIP);
 108
 109         singlesampled_fbo.setup(FboConfig(0,
 110                                           pattern_width,
 111                                           pattern_height));
 112
 113         FboConfig msConfig(num_samples, pattern_width, pattern_height);
 114         multisampled_fbo.setup(msConfig);
 115
 116         compile_shader();
 117         if (!piglit_check_gl_error(GL_NO_ERROR)) {
 118                 piglit_report_result(PIGLIT_FAIL);
 119         }
 120 }
 121
 122 bool test_builtin_num_samples(const Fbo& ms_fbo)
 123 {
 124         GLint samples;
 125         GLfloat expected[4] = {0.0, 1.0, 0.0, 1.0};
 126         bool pass = true;
 127
 128         glUseProgram(prog);
 129         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo.handle);
 130         glGetIntegerv(GL_SAMPLES, &samples);
 131         glUniform1i(glGetUniformLocation(prog, "samples"), MAX2(1, samples));
 132
 133         glClear(GL_COLOR_BUFFER_BIT);
 134         piglit_draw_rect(-1, -1, 2, 2);
 135
 136         glBindFramebuffer(GL_READ_FRAMEBUFFER, ms_fbo.handle);
 137         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, singlesampled_fbo.handle);
 138         glClear(GL_COLOR_BUFFER_BIT);
 139         glBlitFramebuffer(0, 0,
 140                           pattern_width, pattern_height,
 141                           0, 0,
 142                           pattern_width, pattern_height,
 143                           GL_COLOR_BUFFER_BIT,
 144                           GL_NEAREST);
 145
 146         glBindFramebuffer(GL_READ_FRAMEBUFFER, singlesampled_fbo.handle);
 147         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 148
 149         pass = piglit_probe_rect_rgba(0, 0, pattern_width, pattern_height,
 150                                       expected)  && pass;
 151         glClear(GL_COLOR_BUFFER_BIT);
 152         glBlitFramebuffer(0, 0,
 153                           pattern_width, pattern_height,
 154                           0, 0,
 155                           pattern_width, pattern_height,
 156                           GL_COLOR_BUFFER_BIT,
 157                           GL_NEAREST);
 158
 159         piglit_present_results();
 160         return pass;
 161 }
 162
 163 enum piglit_result
 164 piglit_display()
 165 {
 166         bool pass = true;
 167         pass = test_builtin_num_samples(multisampled_fbo)
 168                && pass;
 169         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 170 }