tests/spec/ext_framebuffer_multisample/polygon-stipple.cpp

   1 /*
   2  * Copyright © 2012 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"),
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   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 #include "piglit-fbo.h"
  25 using namespace piglit_util_fbo;
  26
  27 /**
  28  * \file polygon-stipple.cpp
  29  *
  30  * This test case just verifies the functionality of polygon stipple in
  31  * multisample FBO and assumes that MSAA accuracy test already passes.
  32  * Polygon stipple is expected to work exactly the same way on multisample
  33  * FBO as it works on a single sample FBO.
  34  *
  35  * This test operates by drawing a test pattern with GL_POLYGON_STIPPLE
  36  * enabled. Test pattern is first drawn in a single sample FBO to generate
  37  * a reference image in right half of default framebuffer.
  38  *
  39  * Draw the same test pattern in multisample buffer with GL_POLYGON_STIPPLE
  40  * enabled. Blit it in to left half of window system framebuffer.
  41  * This is the test image.
  42  *
  43  * Verify the accuracy of polygon stippling in multisample buffer by
  44  * comparing the two halves of default framebuffer.
  45  */
  46
  47 PIGLIT_GL_TEST_CONFIG_BEGIN
  48
  49         config.supports_gl_compat_version = 10;
  50
  51         config.window_width = 512;
  52         config.window_height = 256;
  53         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  54         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  55
  56 PIGLIT_GL_TEST_CONFIG_END
  57
  58 const int pattern_width = 256; const int pattern_height = 256;
  59
  60 static Fbo ms_fbo, resolve_fbo;
  61 static GLint num_samples;
  62 static GLbitfield buffer_to_test;
  63
  64 static const float bg_color[4] =
  65         {0.0, 0.0, 1.0, 1.0};
  66
  67 static const float color[4][4] = {
  68         /* Red */
  69         {1.0, 0.0, 0.0, 1.0},
  70         /* Green */
  71         {0.0, 1.0, 0.0, 1.0},
  72         /* Yellow */
  73         {1.0, 1.0, 0.0, 1.0},
  74         /* Cyan */
  75         {0.0, 1.0, 1.0, 1.0} };
  76
  77 static GLint prog;
  78 static GLint color_loc;
  79 static GLint depth_loc;
  80
  81 static GLubyte stipple_pattern[] =
  82 {
  83         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  84         0xc0, 0x00, 0x00, 0x03, 0xc0, 0x00, 0x00, 0x03,
  85         0xcf, 0xff, 0xff, 0xf3, 0xcf, 0xff, 0xff, 0xf3,
  86         0xcc, 0x00, 0x00, 0x33, 0xcc, 0x00, 0x00, 0x33,
  87         0xcc, 0xff, 0xff, 0x33, 0xcc, 0xff, 0xff, 0x33,
  88         0xcc, 0xc0, 0x03, 0x33, 0xcc, 0xc0, 0x03, 0x33,
  89         0xcc, 0xcf, 0xf3, 0x33, 0xcc, 0xcf, 0xf3, 0x33,
  90         0xcc, 0xcf, 0xf3, 0x33, 0xcc, 0xcf, 0xf3, 0x33,
  91         0xcc, 0xcf, 0xf3, 0x33, 0xcc, 0xcf, 0xf3, 0x33,
  92         0xcc, 0xcf, 0xf3, 0x33, 0xcc, 0xcf, 0xf3, 0x33,
  93         0xcc, 0xc0, 0x03, 0x33, 0xcc, 0xc0, 0x03, 0x33,
  94         0xcc, 0xff, 0xff, 0x33, 0xcc, 0xff, 0xff, 0x33,
  95         0xcc, 0x00, 0x00, 0x33, 0xcc, 0x00, 0x00, 0x33,
  96         0xcf, 0xff, 0xff, 0xf3, 0xcf, 0xff, 0xff, 0xf3,
  97         0xc0, 0x00, 0x00, 0x03, 0xc0, 0x00, 0x00, 0x03,
  98         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  99 };
 100
 101 static const char *vert =
 102         "#version 120\n"
 103         "attribute vec2 pos;\n"
 104         "uniform float depth;\n"
 105         "void main()\n"
 106         "{\n"
 107         "  vec4 eye_pos = gl_ModelViewProjectionMatrix * vec4(pos, 0.0, 1.0);\n"
 108         "  gl_Position = vec4(eye_pos.xy, depth, 1.0);\n"
 109         "}\n";
 110
 111 static const char *frag =
 112         "#version 120\n"
 113         "uniform vec4 color;\n"
 114         "void main()\n"
 115         "{\n"
 116         "  gl_FragColor = color;\n"
 117         "}\n";
 118
 119 void
 120 shader_compile()
 121 {
 122         /* Compile program */
 123         GLint vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert);
 124         GLint fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag);
 125         prog = piglit_link_simple_program(vs, fs);
 126
 127         if (!piglit_link_check_status(prog)) {
 128                 piglit_report_result(PIGLIT_FAIL);
 129         }
 130
 131         glBindAttribLocation(prog, 0, "pos");
 132         glEnableVertexAttribArray(0);
 133
 134         /* Set up uniforms */
 135         glUseProgram(prog);
 136         color_loc = glGetUniformLocation(prog, "color");
 137         depth_loc = glGetUniformLocation(prog, "depth");
 138 }
 139
 140 void
 141 draw_pattern(void)
 142 {
 143         float vertex_data[10][2] = {
 144                 { 0,                     0 },
 145                 { 0,                     pattern_height },
 146                 { pattern_width / 4,     pattern_height },
 147                 { pattern_width / 4,     0 },
 148                 { pattern_width / 2,     pattern_height },
 149                 { pattern_width / 2,     0 },
 150                 { 3 * pattern_width / 4, pattern_height },
 151                 { 3 * pattern_width / 4, 0 },
 152                 { pattern_width,         pattern_height },
 153                 { pattern_width,         0 },
 154         };
 155
 156         unsigned int indices[24] = {0, 1, 2, 0, 2, 3,
 157                                     3, 2, 4, 3, 4, 5,
 158                                     5, 4, 6, 5, 6, 7,
 159                                     7, 6, 8, 7, 8, 9};
 160         glUseProgram(prog);
 161         glClearColor(bg_color[0], bg_color[1],
 162                      bg_color[2], bg_color[3]);
 163         glClear(buffer_to_test);
 164
 165         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(vertex_data[0]),
 166                               (void *) vertex_data);
 167         glUniform1f(depth_loc, 0.0);
 168
 169         for (int i = 0; i < 4; ++i) {
 170                 glUniform4fv(color_loc, 1, color[i]);
 171                 glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT,
 172                                (void *) (indices + 6 * i));
 173         }
 174 }
 175
 176 bool
 177 test_polygon_stipple()
 178 {
 179         bool result = true;
 180         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo.handle);
 181         draw_pattern();
 182
 183         /* Blit ms_fbo to resolve_fbo to resolve multisample buffer */
 184         glBindFramebuffer(GL_READ_FRAMEBUFFER, ms_fbo.handle);
 185         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolve_fbo.handle);
 186         glBlitFramebuffer(0, 0, pattern_width, pattern_height,
 187                           0, 0, pattern_width, pattern_height,
 188                           buffer_to_test, GL_NEAREST);
 189
 190         /* Blit resolve_fbo to the left half of window system framebuffer.
 191          * This is the test image.
 192          */
 193         glBindFramebuffer(GL_READ_FRAMEBUFFER, resolve_fbo.handle);
 194         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 195         glBlitFramebuffer(0, 0, pattern_width, pattern_height,
 196                           0, 0, pattern_width, pattern_height,
 197                           buffer_to_test, GL_NEAREST);
 198
 199         /* Check that the left and right halves of the screen match */
 200         glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
 201         result = piglit_probe_rect_halves_equal_rgba(0, 0, piglit_width,
 202                                                      piglit_height)
 203                  && result;
 204
 205         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 206         result = piglit_check_gl_error(GL_NO_ERROR) && result;
 207         return result;
 208 }
 209
 210 void
 211 print_usage_and_exit(char *prog_name)
 212 {
 213         printf("Usage: %s <num_samples>\n", prog_name);
 214         piglit_report_result(PIGLIT_FAIL);
 215 }
 216
 217 void
 218 piglit_init(int argc, char **argv)
 219 {
 220         if (argc < 2)
 221                 print_usage_and_exit(argv[0]);
 222         {
 223                 char *endptr = NULL;
 224                 num_samples = strtol(argv[1], &endptr, 0);
 225                 if (endptr != argv[1] + strlen(argv[1]))
 226                         print_usage_and_exit(argv[0]);
 227         }
 228
 229         piglit_require_gl_version(21);
 230         piglit_require_extension("GL_ARB_framebuffer_object");
 231         piglit_require_extension("GL_ARB_vertex_array_object");
 232
 233         piglit_ortho_projection(pattern_width, pattern_height, GL_TRUE);
 234
 235         /* Skip the test if num_samples > GL_MAX_SAMPLES */
 236         GLint max_samples;
 237         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
 238         if (num_samples > max_samples)
 239                 piglit_report_result(PIGLIT_SKIP);
 240
 241         ms_fbo.setup(FboConfig(num_samples, pattern_width, pattern_height));
 242         resolve_fbo.setup(FboConfig(0, pattern_width, pattern_height));
 243
 244         buffer_to_test = GL_COLOR_BUFFER_BIT;
 245         shader_compile();
 246         glEnable(GL_POLYGON_STIPPLE);
 247         glPolygonStipple(stipple_pattern);
 248
 249 }
 250
 251 enum piglit_result
 252 piglit_display()
 253 {
 254         bool pass = true;
 255         glClearColor(0.0, 0.0, 0.0, 1.0);
 256         glClear(GL_COLOR_BUFFER_BIT);
 257
 258         /* Draw test pattern in single sample resolve_fbo with GL_POLYGON_STIPPLE
 259          * enabled.
 260          */
 261         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolve_fbo.handle);
 262         resolve_fbo.set_viewport();
 263         draw_pattern();
 264
 265         /* Blit resolve_fbo to the right half of window system framebuffer. This
 266          * is a reference image.
 267          */
 268         glBindFramebuffer(GL_READ_FRAMEBUFFER, resolve_fbo.handle);
 269         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 270         glBlitFramebuffer(0, 0, pattern_width, pattern_height,
 271                           pattern_width, 0, 2 * pattern_width, pattern_height,
 272                           buffer_to_test, GL_NEAREST);
 273
 274         /* Test with multisample FBO and GL_POLYGON_STIPPLE enabled */
 275         pass = test_polygon_stipple() && pass;
 276
 277         if (!piglit_automatic &&
 278             buffer_to_test != GL_DEPTH_BUFFER_BIT)
 279                 piglit_present_results();
 280
 281         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 282 }