tests/general/two-sided-lighting.c

   1 /*
   2  * Copyright © 2011 VMware, Inc.
   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  * Tests simple two-sided lighting.
  26  *
  27  * One command line option: if "flat" is specified, use flat shading.
  28  * It shouldn't make any difference though because we only specify one normal
  29  * vector per quad.
  30  *
  31  * Brian Paul
  32  * Oct 2011
  33  */
  34
  35 #include "piglit-util-gl.h"
  36
  37 PIGLIT_GL_TEST_CONFIG_BEGIN
  38
  39         config.supports_gl_compat_version = 10;
  40
  41         config.window_width = 256;
  42         config.window_height = 256;
  43         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  44
  45 PIGLIT_GL_TEST_CONFIG_END
  46
  47 static const GLfloat green[4] = {0, 1, 0, 1};
  48 static const GLfloat blue[4] = {0, 0, 1, 1};
  49
  50
  51 enum piglit_result
  52 piglit_display(void)
  53 {
  54         int x0 = piglit_width * 1 / 4;
  55         int x1 = piglit_width * 3 / 4;
  56         int y0 = piglit_height * 1 / 4;
  57         int y1 = piglit_height * 3 / 4;
  58         GLboolean pass = GL_TRUE;
  59
  60         glClear(GL_COLOR_BUFFER_BIT);
  61
  62         glFrontFace(GL_CCW);  /* the default winding */
  63
  64         glBegin(GL_QUADS);
  65         /* counter-clockwise / front-facing */
  66         glNormal3f(0, 0, 1);
  67         glVertex2f(-1.0, -1.0);
  68         glVertex2f( 0.0, -1.0);
  69         glVertex2f( 0.0,  0.0);
  70         glVertex2f(-1.0,  0.0);
  71
  72         /* clockwise / back-facing */
  73         glNormal3f(0, 0, -1);
  74         glVertex2f( 0.0, -1.0);
  75         glVertex2f( 0.0,  0.0);
  76         glVertex2f( 1.0,  0.0);
  77         glVertex2f( 1.0, -1.0);
  78         glEnd();
  79
  80         glFrontFace(GL_CW);  /* reverse winding */
  81
  82         glBegin(GL_QUADS);
  83         /* counter-clockwise / back-facing */
  84         glNormal3f(0, 0, -1);
  85         glVertex2f(-1.0, 0.0);
  86         glVertex2f( 0.0, 0.0);
  87         glVertex2f( 0.0, 1.0);
  88         glVertex2f(-1.0, 1.0);
  89
  90         /* clockwise / front-facing */
  91         glNormal3f(0, 0, 1);
  92         glVertex2f( 0.0, 0.0);
  93         glVertex2f( 0.0, 1.0);
  94         glVertex2f( 1.0, 1.0);
  95         glVertex2f( 1.0, 0.0);
  96         glEnd();
  97
  98         pass = piglit_probe_pixel_rgb(x0, y0, green) && pass;
  99         pass = piglit_probe_pixel_rgb(x1, y0, blue) && pass;
 100         pass = piglit_probe_pixel_rgb(x0, y1, blue) && pass;
 101         pass = piglit_probe_pixel_rgb(x1, y1, green) && pass;
 102
 103         piglit_present_results();
 104
 105         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 106 }
 107
 108
 109 void
 110 piglit_init(int argc, char **argv)
 111 {
 112         int i;
 113
 114         for (i = 1; i < argc; i++) {
 115                 if (strcmp(argv[i], "flat") == 0) {
 116                         glShadeModel(GL_FLAT);
 117                         break;
 118                 }
 119         }
 120
 121         glClearColor(0.5, 0.5, 0.5, 0.0);
 122
 123         glMatrixMode(GL_PROJECTION);
 124         glLoadIdentity();
 125         glOrtho(-1.1, 1.1, -1.1, 1.1, -1.0, 1.0);
 126         glMatrixMode(GL_MODELVIEW);
 127         glLoadIdentity();
 128
 129         glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
 130         glMaterialfv(GL_BACK, GL_AMBIENT_AND_DIFFUSE, blue);
 131         glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
 132         glEnable(GL_LIGHT0);
 133         glEnable(GL_LIGHTING);
 134 }