tests/general/infinite-spot-light.c

   1 /*
   2  * Copyright (C) 2011 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 DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Yuanhan Liu <yuanhan.liu@linux.intel.com>
  25  */
  26
  27 /** @file infinite-spot-light.c
  28  *
  29  * This is a case that sounds doesn't make sense, but it is allowed by glSpec
  30  * (see section 2.14.1 Lightin of glspec 2.1.pdf).  While writing this case,
  31  * it servers as two purposes:
  32  *
  33  *   1. Test if swrast is OK with this case.
  34  *      The old mesa code would always compute a zero attenuation, thus always
  35  *      get a black lighting color.
  36  *
  37  *   2. Test if hardware rendering(only i965 tested) is OK with this patch.
  38  *      The old mesa code would skip the attenuation and spot computation while
  39  *      infinite light is met. This is somehow not permitted by glSpec.
  40  */
  41
  42 #include "piglit-util-gl.h"
  43
  44 PIGLIT_GL_TEST_CONFIG_BEGIN
  45
  46         config.supports_gl_compat_version = 10;
  47
  48         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  49
  50 PIGLIT_GL_TEST_CONFIG_END
  51
  52 /* Already normalized, and 0.5 would be the expected color */
  53 static GLfloat dir[3] = {0.866025404, 0.0, 0.5};
  54 static GLfloat pos[4] = {0.0, 0.0, -1.0, 0.0};          /* infinite */
  55 static GLfloat light_ambient[3] = {1.0, 0.0, 0.0};
  56
  57 enum piglit_result
  58 piglit_display(void)
  59 {
  60         GLboolean pass = GL_TRUE;
  61         GLfloat expected[4] = {0.5, 0.0, 0.0, 1.0};
  62
  63         glClear(GL_COLOR_BUFFER_BIT);
  64
  65         glPointSize(10);
  66         glBegin(GL_POINTS);
  67                 glVertex2f(0.5, 0.5);
  68         glEnd();
  69
  70         pass = piglit_probe_pixel_rgba(0, 0, expected);
  71
  72         piglit_present_results();
  73
  74         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  75 }
  76
  77
  78 void
  79 piglit_init(int argc, char **argv)
  80 {
  81         GLfloat buf[4] = {0.0, 0.0, 0.0, 1.0};
  82
  83         glClearColor(0.0, 0.0, 0.0, 1.0);
  84
  85         glEnable(GL_LIGHT0);
  86         glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 89.0);
  87         glLightf(GL_LIGHT0, GL_SPOT_EXPONENT, 1.0);
  88         glLightfv(GL_LIGHT0, GL_POSITION, pos);
  89         glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, dir);
  90         glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
  91
  92         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, buf);
  93         glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 0);
  94
  95         glMaterialfv(GL_FRONT, GL_DIFFUSE, buf);
  96         glMaterialfv(GL_FRONT, GL_SPECULAR, buf);
  97
  98         buf[0] = 1.0;
  99         buf[1] = 1.0;
 100         buf[2] = 1.0;
 101         glMaterialfv(GL_FRONT, GL_AMBIENT, buf);
 102
 103         glEnable(GL_LIGHTING);
 104
 105         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 106 }