tests/general/provoking-vertex.c

   1 /*
   2  * Copyright © 2009 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
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Ben Holmes <shranzel@hotmail.com>
  25  */
  26
  27 /*
  28 * draws two triangles using different colors for each vert(1st-red, 2nd-green,
  29 * 3rd-blue). first tri drawn using glProvokingVertexEXT set to
  30 * GL_FIRST_VERTEX_CONVENTION_EXT.
  31 * Second tri using GL_LAST_VERTEX_CONVENTION_EXT.
  32 */
  33
  34 #include "piglit-util-gl.h"
  35
  36 PIGLIT_GL_TEST_CONFIG_BEGIN
  37
  38         config.supports_gl_compat_version = 10;
  39
  40         config.window_width = 400;
  41         config.window_height = 300;
  42         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  43
  44 PIGLIT_GL_TEST_CONFIG_END
  45
  46 void
  47 piglit_init(int argc, char **argv)
  48 {
  49
  50         piglit_require_extension("GL_EXT_provoking_vertex");
  51         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  52
  53         glShadeModel(GL_FLAT);
  54         glClearColor(0.2, 0.2, 0.2, 1.0);
  55
  56 }
  57
  58 enum piglit_result
  59 piglit_display(void)
  60 {
  61         static const float red[3] = {0.9, 0.0, 0.0};
  62         static const float blue[3] = {0.0, 0.0, 0.9};
  63         static const float green[3] = {0.0, 1.0, 0.0};
  64         GLboolean pass = GL_TRUE;
  65
  66         glClear(GL_COLOR_BUFFER_BIT);
  67         glProvokingVertexEXT(GL_FIRST_VERTEX_CONVENTION_EXT);
  68         /* lower triangle: counter-clockwise */
  69         glBegin(GL_TRIANGLES);
  70                 glColor3fv(red);
  71                 glVertex3i(125, 85, 0);
  72                 glColor3fv(green);
  73                 glVertex3i(175, 85, 0);
  74                 glColor3fv(blue);
  75                 glVertex3i(150, 110, 0);
  76         glEnd();
  77
  78         /* upper triangle: clockwise */
  79         glBegin(GL_TRIANGLES);
  80                 glColor3fv(red);
  81                 glVertex3i(125, 165, 0);
  82                 glColor3fv(blue);
  83                 glVertex3i(150, 190, 0);
  84                 glColor3fv(green);
  85                 glVertex3i(175, 165, 0);
  86         glEnd();
  87
  88         glProvokingVertexEXT(GL_LAST_VERTEX_CONVENTION_EXT);
  89         /* lower triangle: counter-clockwise */
  90         glBegin(GL_TRIANGLES);
  91                 glColor3fv(red);
  92                 glVertex3i(200, 85, 0);
  93                 glColor3fv(green);
  94                 glVertex3i(250, 85, 0);
  95                 glColor3fv(blue);
  96                 glVertex3i(225, 110, 0);
  97         glEnd();
  98
  99         /* upper triangle: clockwise */
 100         glBegin(GL_TRIANGLES);
 101                 glColor3fv(green);
 102                 glVertex3i(250, 165, 0);
 103                 glColor3fv(red);
 104                 glVertex3i(200, 165, 0);
 105                 glColor3fv(blue);
 106                 glVertex3i(225, 190, 0);
 107         glEnd();
 108
 109         pass = pass && piglit_probe_pixel_rgb(150, 90, red);
 110         pass = pass && piglit_probe_pixel_rgb(150, 170, red);
 111
 112         pass = pass && piglit_probe_pixel_rgb(225, 90, blue);
 113         pass = pass && piglit_probe_pixel_rgb(225, 170, blue);
 114
 115         glFinish();
 116         piglit_present_results();
 117
 118         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 119 }