tests/spec/arb_provoking_vertex/clipped-geometry-flatshading.c

   1 /*
   2  * Copyright © 2018 Danylo Piliaiev
   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  * Test that provoking vertex works as expected when part of the geometry
  26  * is clipped when flat shading is enabled.
  27  *
  28  * https://bugs.freedesktop.org/show_bug.cgi?id=103047
  29  */
  30
  31 #include "piglit-util-gl.h"
  32
  33 PIGLIT_GL_TEST_CONFIG_BEGIN
  34         config.supports_gl_compat_version = 10;
  35         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  36 PIGLIT_GL_TEST_CONFIG_END
  37
  38 void
  39 piglit_init(int argc, char **argv)
  40 {
  41         piglit_require_extension("GL_EXT_provoking_vertex");
  42         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  43
  44         glShadeModel(GL_FLAT);
  45 }
  46
  47 enum piglit_result
  48 piglit_display(void)
  49 {
  50         static const float red[3] = {1, 0, 0},
  51                 green[3] = {0, 1, 0},
  52                 blue[3] = {0, 0, 1},
  53                 yellow[3] = {1, 1, 0},
  54                 cyan[3] = {0, 1, 1};
  55
  56         bool pass = true;
  57
  58         glClear(GL_COLOR_BUFFER_BIT);
  59         glProvokingVertexEXT(GL_LAST_VERTEX_CONVENTION_EXT);
  60
  61         const int y1 = piglit_height / 3;
  62
  63         glBegin(GL_TRIANGLE_STRIP);
  64                 glColor3fv(cyan);
  65                 glVertex3i(piglit_width + 1, y1, 0);
  66                 glColor3fv(yellow);
  67                 glVertex3i(piglit_width + 2, y1, 0);
  68                 glColor3fv(blue);
  69                 glVertex3i(piglit_width + 3, y1, 0);
  70                 glColor3fv(green);
  71                 glVertex3i(piglit_width / 2, y1 * 2, 0);
  72                 glColor3fv(red);
  73                 glVertex3i(piglit_width - 1, y1 * 2, 0);
  74         glEnd();
  75
  76         pass = pass && piglit_probe_pixel_rgb(piglit_width - 2, y1 * 3 / 2, red);
  77
  78         piglit_present_results();
  79
  80         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  81 }