tests/spec/gl-1.2/rescale-normal.c

   1 /*
   2  * Copyright © 2017 Fabian Bieler
   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  * @file rescale-normal.c:  Rescale normals with fixed function pipeline.
  26  *
  27  * Set up scene with diffuse lighting and an isotropic modelview scale of 100.
  28  * Set the light color to 1% red, 100% green, 0% blue.
  29  * If the normal is scaled incorrectly in either direction, the sampled color
  30  * would be black or yellow, respectively, instead of green.
  31  */
  32
  33 #include "piglit-util-gl.h"
  34
  35 PIGLIT_GL_TEST_CONFIG_BEGIN
  36
  37         config.supports_gl_compat_version = 12;
  38         config.window_visual = PIGLIT_GL_VISUAL_RGB;
  39         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  40
  41 PIGLIT_GL_TEST_CONFIG_END
  42
  43 static const float green_with_a_smitch_of_red[] = {0.01, 1, 0, 1};
  44
  45 enum piglit_result
  46 piglit_display(void)
  47 {
  48         piglit_draw_rect(-0.01, -0.01, 0.02, 0.02);
  49         bool pass = piglit_probe_pixel_rgb(piglit_width / 2,
  50                                            piglit_height / 2,
  51                                            green_with_a_smitch_of_red);
  52
  53         piglit_present_results();
  54
  55         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  56 }
  57
  58 void
  59 piglit_init(int argc, char **argv)
  60 {
  61         const float black[] = {0, 0, 0, 1};
  62         const float white[] = {1, 1, 1, 1};
  63
  64         glEnable(GL_LIGHTING);
  65         glEnable(GL_LIGHT0);
  66
  67         glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, black);
  68         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, white);
  69
  70         glLightfv(GL_LIGHT0, GL_DIFFUSE, green_with_a_smitch_of_red);
  71
  72         glScalef(100.0, 100.0, 100.0);
  73         glEnable(GL_RESCALE_NORMAL);
  74
  75         glNormal3f(0, 0, 1);
  76 }