tests/spec/arb_sample_shading/execution/ignore-centroid-qualifier.cpp

   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 /**
  25  * @file ignore-centroid-qualifier.cpp
  26  *
  27  * Tests that all 'in' variables in fragment shader are interpolated at sample
  28  * positions when using per sample shading. Ignore the 'centroid' qualifier if
  29  * used with 'in' variable.
  30  *
  31  */
  32 #include "piglit-util-gl.h"
  33 #include "piglit-fbo.h"
  34
  35 using namespace piglit_util_fbo;
  36 const int pattern_width = 128; const int pattern_height = 128;
  37
  38 PIGLIT_GL_TEST_CONFIG_BEGIN
  39         config.supports_gl_compat_version = 21;
  40         config.supports_gl_core_version = 31;
  41         config.window_width = 2 * pattern_width;
  42         config.window_height = pattern_height;
  43         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  44         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  45
  46 PIGLIT_GL_TEST_CONFIG_END
  47
  48 static Fbo multisampled_fbo;
  49 static int sample_pos_loc, sample_id_loc, num_samples;
  50 static int draw_prog_left, draw_prog_right, test_prog;
  51
  52 enum piglit_result
  53 piglit_display(void)
  54 {
  55         float pos[2];
  56         bool result = true, pass = true;
  57
  58         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_fbo.handle);
  59         glClear(GL_COLOR_BUFFER_BIT);
  60
  61         /* Draw test image in to left half of multisample fbo*/
  62         glUseProgram(draw_prog_left);
  63         glViewport(0, 0, pattern_width, pattern_height);
  64         glEnable(GL_SAMPLE_SHADING);
  65         glMinSampleShading(1.0);
  66         piglit_draw_rect(-1, -1, 2, 2);
  67         glDisable(GL_SAMPLE_SHADING);
  68
  69         for(int i = 0; i < num_samples; i++) {
  70                 /* Draw reference image in to right half of multisample fbo */
  71                 glUseProgram(draw_prog_right);
  72                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_fbo.handle);
  73                 glGetMultisamplefv(GL_SAMPLE_POSITION, i, pos);
  74                 glUniform2fv(sample_pos_loc, 1, pos);
  75                 glEnable(GL_SCISSOR_TEST);
  76                 glScissor(pattern_width, 0, pattern_width, pattern_height);
  77                 glViewport(pattern_width, 0, pattern_width, pattern_height);
  78                 glClear(GL_COLOR_BUFFER_BIT);
  79                 piglit_draw_rect(-1, -1, 2, 2);
  80                 glDisable(GL_SCISSOR_TEST);
  81
  82                 /* Draw sample color from multisample texture in to winsys fbo */
  83                 glUseProgram(test_prog);
  84                 glUniform1i(sample_id_loc, i);
  85                 glViewport(0, 0, 2 * pattern_width, pattern_height);
  86                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
  87                 glClear(GL_COLOR_BUFFER_BIT);
  88                 piglit_draw_rect(-1, -1, 2, 2);
  89
  90                 result = piglit_probe_rect_halves_equal_rgba(0, 0,
  91                                                              piglit_width,
  92                                                              piglit_height);
  93                 pass = pass && result;
  94                 printf("sample_id = %d, result = %s\n", i,
  95                        result ? "pass" : "fail");
  96         }
  97         piglit_present_results();
  98         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  99 }
 100
 101 static void
 102 print_usage_and_exit(char *prog_name)
 103 {
 104         printf("Usage: %s <num_samples>\n", prog_name);
 105         piglit_report_result(PIGLIT_FAIL);
 106 }
 107
 108 void
 109 piglit_init(int argc, char**argv)
 110 {
 111         if (argc != 2)
 112                 print_usage_and_exit(argv[0]);
 113
 114         /* 1st arg: num_samples */
 115         char *endptr = NULL;
 116         num_samples = strtol(argv[1], &endptr, 0);
 117         if (endptr != argv[1] + strlen(argv[1]))
 118                 print_usage_and_exit(argv[0]);
 119
 120         piglit_require_extension("GL_ARB_texture_multisample");
 121         piglit_require_extension("GL_ARB_sample_shading");
 122         piglit_require_GLSL_version(130);
 123
 124         /* Skip the test if num_samples > GL_MAX_SAMPLES */
 125         GLint max_samples;
 126         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
 127         if (num_samples == 0 || num_samples > max_samples)
 128                 piglit_report_result(PIGLIT_SKIP);
 129
 130         FboConfig msConfig(num_samples, piglit_width, piglit_height);
 131         msConfig.num_rb_attachments = 0;
 132         msConfig.num_tex_attachments = 1;
 133         multisampled_fbo.setup(msConfig);
 134
 135         /* Reduced tolerance for stricter color matching */
 136         piglit_set_tolerance_for_bits(16, 16, 16, 16);
 137         draw_prog_left = piglit_build_simple_program(
 138                 "#version 130\n"
 139                 "#extension GL_ARB_sample_shading: require\n"
 140                 "in vec4 piglit_vertex;\n"
 141                 "centroid out vec2 test;\n"
 142                 "void main() {\n"
 143                 "       gl_Position = piglit_vertex;\n"
 144                 "       test = piglit_vertex.xy;\n"
 145                 "}\n",
 146
 147                 "#version 130\n"
 148                 "#extension GL_ARB_sample_shading: require\n"
 149                 "centroid in vec2 test;\n"
 150                 "out vec4 fragcolor;\n"
 151                 "void main() {\n"
 152                 "       fragcolor = vec4(abs(test), 0, 1);\n"
 153                 "}\n");
 154
 155         draw_prog_right = piglit_build_simple_program(
 156                 "#version 130\n"
 157                 "uniform vec2 sample_pos;\n"
 158                 "in vec4 piglit_vertex;\n"
 159                 "out vec2 ref;\n"
 160                 "void main() {\n"
 161                 "       gl_Position = piglit_vertex;\n"
 162                 "       ref = piglit_vertex.xy;\n"
 163                         /* Add an offset to account for interplolation at
 164                          * sample position. pattern_width == pattern_height
 165                          * == 128, so the scaling factor between normalized
 166                          * device coordinates and pixels is 128/2 == 64.
 167                          */
 168                 "       ref += (sample_pos - 0.5) / 64;\n"
 169                 "}\n",
 170
 171                 "#version 130\n"
 172                 "in vec2 ref;\n"
 173                 "out vec4 fragcolor;\n"
 174                 "void main() {\n"
 175                 "       fragcolor = vec4(abs(ref), 0, 1);\n"
 176                 "}\n");
 177         sample_pos_loc = glGetUniformLocation(draw_prog_right, "sample_pos");
 178
 179         test_prog = piglit_build_simple_program(
 180                 "#version 130\n"
 181                 "in vec4 piglit_vertex;\n"
 182                 "void main() {\n"
 183                 "       gl_Position = piglit_vertex;\n"
 184                 "}\n",
 185
 186                 "#version 130\n"
 187                 "#extension GL_ARB_texture_multisample: require\n"
 188                 "uniform int sample_id;\n"
 189                 "uniform sampler2DMS tex;\n"
 190                 "out vec4 fragcolor;\n"
 191                 "void main() {\n"
 192                 "       fragcolor =  texelFetch(tex, ivec2(gl_FragCoord.xy),\n"
 193                 "                                  sample_id);\n"
 194                 "}\n");
 195
 196         glUseProgram(test_prog);
 197         glUniform1i(glGetUniformLocation(test_prog, "tex"), 0);
 198         sample_id_loc = glGetUniformLocation(test_prog, "sample_id");
 199 }