tests/spec/arb_sample_shading/execution/interpolate-at-sample-position.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 interpolate-at-sample-position.cpp
  26  *
  27  * Tests that 'in' and 'centroid in" variables used at the same time
  28  * in a fragment shader are interpolated at sample positions when using
  29  * per sample shading.
  30  */
  31 #include "piglit-util-gl.h"
  32 #include "piglit-fbo.h"
  33
  34 using namespace piglit_util_fbo;
  35 const int pattern_width = 128; const int pattern_height = 128;
  36
  37 PIGLIT_GL_TEST_CONFIG_BEGIN
  38         config.supports_gl_compat_version = 21;
  39         config.supports_gl_core_version = 31;
  40         config.window_width = 2 * pattern_width;
  41         config.window_height = 2 * 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 Fbo multisampled_fbo;
  48 static int sample_pos_loc, sample_id_loc, num_samples;
  49 static int draw_prog_left, draw_prog_right, test_prog;
  50
  51 enum piglit_result
  52 piglit_display(void)
  53 {
  54         float pos[2];
  55         bool result = true, pass = true;
  56         GLenum buffers[2] = {GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1};
  57
  58         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_fbo.handle);
  59         glDrawBuffers(2, buffers);
  60         glClear(GL_COLOR_BUFFER_BIT);
  61
  62         /* Draw test image in to left half of multisample fbo*/
  63         glUseProgram(draw_prog_left);
  64         glViewport(0, 0, pattern_width, pattern_height);
  65         glEnable(GL_SAMPLE_SHADING);
  66         glMinSampleShading(1.0);
  67         piglit_draw_rect(-1, -1, 2, 2);
  68         glDisable(GL_SAMPLE_SHADING);
  69
  70         for(int i = 0; i < num_samples; i++) {
  71                 /* Draw reference image in to right half of multisample fbo */
  72                 glUseProgram(draw_prog_right);
  73                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_fbo.handle);
  74                 glDrawBuffers(2, buffers);
  75                 glGetMultisamplefv(GL_SAMPLE_POSITION, i, pos);
  76                 glUniform2fv(sample_pos_loc, 1, pos);
  77                 glEnable(GL_SCISSOR_TEST);
  78                 glScissor(pattern_width, 0, pattern_width, pattern_height);
  79                 glViewport(pattern_width, 0, pattern_width, pattern_height);
  80                 glClear(GL_COLOR_BUFFER_BIT);
  81                 piglit_draw_rect(-1, -1, 2, 2);
  82                 glDisable(GL_SCISSOR_TEST);
  83
  84                 /* Draw sample color from multisample texture in to winsys fbo.
  85                  * The first color attachment should be in the upper half of
  86                  * the screen and the second one should be in the lower half.
  87                  */
  88                 glUseProgram(test_prog);
  89                 glUniform1i(sample_id_loc, i);
  90                 glActiveTexture(GL_TEXTURE0);
  91                 glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, multisampled_fbo.color_tex[0]);
  92                 glActiveTexture(GL_TEXTURE1);
  93                 glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, multisampled_fbo.color_tex[1]);
  94
  95                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
  96                 glDrawBuffer(GL_BACK);
  97                 glClear(GL_COLOR_BUFFER_BIT);
  98                 glViewport(0, 0, 2 * pattern_width, 2 * pattern_height);
  99                 piglit_draw_rect(-1, -1, 2, 2);
 100
 101                 result = piglit_probe_rect_halves_equal_rgba(0, 0,
 102                                                              piglit_width,
 103                                                              piglit_height);
 104                 pass = pass && result;
 105                 printf("sample_id = %d, result = %s\n", i,
 106                        result ? "pass" : "fail");
 107         }
 108         piglit_present_results();
 109         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 110 }
 111
 112 static void
 113 print_usage_and_exit(char *prog_name)
 114 {
 115         printf("Usage: %s <num_samples>\n", prog_name);
 116         piglit_report_result(PIGLIT_FAIL);
 117 }
 118
 119 void
 120 piglit_init(int argc, char**argv)
 121 {
 122         if (argc != 2)
 123                 print_usage_and_exit(argv[0]);
 124
 125         /* 1st arg: num_samples */
 126         char *endptr = NULL;
 127         num_samples = strtol(argv[1], &endptr, 0);
 128         if (endptr != argv[1] + strlen(argv[1]))
 129                 print_usage_and_exit(argv[0]);
 130
 131         piglit_require_extension("GL_ARB_texture_multisample");
 132         piglit_require_extension("GL_ARB_sample_shading");
 133         piglit_require_GLSL_version(130);
 134
 135         /* Skip the test if num_samples > GL_MAX_SAMPLES */
 136         GLint max_samples;
 137         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
 138         if (num_samples == 0 || num_samples > max_samples)
 139                 piglit_report_result(PIGLIT_SKIP);
 140
 141         FboConfig msConfig(num_samples, piglit_width, piglit_height);
 142         msConfig.num_rb_attachments = 0;
 143         msConfig.num_tex_attachments = 2;
 144         msConfig.tex_attachment[1] = GL_COLOR_ATTACHMENT1;
 145         multisampled_fbo.setup(msConfig);
 146
 147         /* Reduced tolerance for stricter color matching */
 148         piglit_set_tolerance_for_bits(16, 16, 16, 16);
 149         draw_prog_left = piglit_build_simple_program(
 150                 "#version 130\n"
 151                 "#extension GL_ARB_sample_shading: require\n"
 152                 "in vec4 piglit_vertex;\n"
 153                 "out vec2 test_center;\n"
 154                 "centroid out vec2 test_centroid;\n"
 155                 "void main() {\n"
 156                 "       gl_Position = piglit_vertex;\n"
 157                 "       test_center = piglit_vertex.xy;\n"
 158                 "       test_centroid = piglit_vertex.xy;\n"
 159                 "}\n",
 160
 161                 "#version 130\n"
 162                 "#extension GL_ARB_sample_shading: require\n"
 163                 "in vec2 test_center;\n"
 164                 "centroid in vec2 test_centroid;\n"
 165                 "out vec4 fragdata[2];\n"
 166                 "void main() {\n"
 167                 "       fragdata[0] = vec4(abs(test_center), 0, 1);\n"
 168                 "       fragdata[1] = vec4(abs(test_centroid), 0, 1);\n"
 169                 "}\n");
 170
 171         draw_prog_right = piglit_build_simple_program(
 172                 "#version 130\n"
 173                 "uniform vec2 sample_pos;\n"
 174                 "in vec4 piglit_vertex;\n"
 175                 "out vec2 ref;\n"
 176                 "void main() {\n"
 177                 "       gl_Position = piglit_vertex;\n"
 178                 "       ref = piglit_vertex.xy;\n"
 179                         /* Add an offset to account for interplolation at
 180                          * sample position. pattern_width == pattern_height
 181                          * == 128, so the scaling factor between normalized
 182                          * device coordinates and pixels is 128/2 == 64.
 183                          */
 184                 "       ref += (sample_pos - 0.5) / 64;\n"
 185                 "}\n",
 186
 187                 "#version 130\n"
 188                 "in vec2 ref;\n"
 189                 "out vec4 fragdata[2];\n"
 190                 "void main() {\n"
 191                 "       fragdata[0] = vec4(abs(ref), 0, 1);\n"
 192                 "       fragdata[1] = vec4(abs(ref), 0, 1);\n"
 193                 "}\n");
 194         sample_pos_loc = glGetUniformLocation(draw_prog_right, "sample_pos");
 195
 196         test_prog = piglit_build_simple_program(
 197                 "#version 130\n"
 198                 "in vec4 piglit_vertex;\n"
 199                 "void main() {\n"
 200                 "       gl_Position = piglit_vertex;\n"
 201                 "}\n",
 202
 203                 "#version 130\n"
 204                 "#extension GL_ARB_texture_multisample: require\n"
 205                 "uniform int sample_id;\n"
 206                 "uniform sampler2DMS tex_center;\n"
 207                 "uniform sampler2DMS tex_centroid;\n"
 208                 "out vec4 fragcolor;\n"
 209                 "void main() {\n"
 210                 "       ivec2 coord = ivec2(gl_FragCoord.xy);\n"
 211                 "       fragcolor = coord.y < 128 ? \n"
 212                 "               texelFetch(tex_center, coord, sample_id) :\n"
 213                 "               texelFetch(tex_centroid, coord - ivec2(0, 128), sample_id);\n"
 214                 "}\n");
 215
 216         glUseProgram(test_prog);
 217         glUniform1i(glGetUniformLocation(test_prog, "tex_center"), 0);
 218         glUniform1i(glGetUniformLocation(test_prog, "tex_centroid"), 1);
 219         sample_id_loc = glGetUniformLocation(test_prog, "sample_id");
 220 }