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.h"
  35
  36 int piglit_width = 400, piglit_height = 300;
  37 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  38
  39 #ifndef APIENTRY
  40 #define APIENTRY
  41 #endif
  42 #ifndef APIENTRYP
  43 #define APIENTRYP APIENTRY *
  44 #endif
  45 #ifndef GL_EXT_provoking_vertex
  46 #define GL_EXT_provoking_vertex
  47 #define GL_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION_EXT 0x8E4C
  48 #define GL_FIRST_VERTEX_CONVENTION_EXT    0x8E4D
  49 #define GL_LAST_VERTEX_CONVENTION_EXT     0x8E4E
  50 #define GL_PROVOKING_VERTEX_EXT           0x8E4F
  51 typedef void (APIENTRYP PFNGLPROVOKINGVERTEXEXTPROC) (GLenum mode);
  52 #endif
  53
  54 static PFNGLPROVOKINGVERTEXEXTPROC pglProvokingVertexEXT = 0;
  55
  56 void
  57 piglit_init(int argc, char **argv)
  58 {
  59
  60         piglit_require_extension("GL_EXT_provoking_vertex");
  61         pglProvokingVertexEXT = (PFNGLPROVOKINGVERTEXEXTPROC)
  62                 piglit_get_proc_address("glProvokingVertexEXT");
  63
  64         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  65
  66         glShadeModel(GL_FLAT);
  67
  68         glClearColor(0.2, 0.2, 0.2, 1.0);
  69
  70 }
  71
  72 enum piglit_result
  73 piglit_display(void)
  74 {
  75         float red[3] = {1.0, 0.0, 0.0};
  76         float blue[3] = {0.0, 0.0, 1.0};
  77         GLboolean pass = GL_TRUE;
  78
  79         glClear(GL_COLOR_BUFFER_BIT);
  80         pglProvokingVertexEXT(GL_FIRST_VERTEX_CONVENTION_EXT);
  81         glBegin(GL_TRIANGLES);
  82                 glColor3f(1.0, 0.0, 0.0);
  83                 glVertex3i(125, 125, 0);
  84                 glColor3f(0.0, 1.0, 0.0);
  85                 glVertex3i(175, 125, 0);
  86                 glColor3f(0.0, 0.0, 1.0);
  87                 glVertex3i(150, 150, 0);
  88         glEnd();
  89
  90         pglProvokingVertexEXT(GL_LAST_VERTEX_CONVENTION_EXT);
  91         glBegin(GL_TRIANGLES);
  92                 glColor3f(1.0, 0.0, 0.0);
  93                 glVertex3i(200, 125, 0);
  94                 glColor3f(0.0, 1.0, 0.0);
  95                 glVertex3i(250, 125, 0);
  96                 glColor3f(0.0, 0.0, 1.0);
  97                 glVertex3i(225, 150, 0);
  98         glEnd();
  99
 100         pass = pass && piglit_probe_pixel_rgb(150, 130, red);
 101         pass = pass && piglit_probe_pixel_rgb(225, 130, blue);
 102
 103         glFinish();
 104         glutSwapBuffers();
 105
 106         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 107 }