tests/shaders/glsl-orangebook-ch06-bump.c

   1 /*
   2  * Copyright © 2010 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  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 /** @file glsl-orangebook-ch06-bump.c
  29  *
  30  * Tests that the Orange Book's chapter 6 shader for procedural bumpmapping
  31  * works correctly.
  32  */
  33
  34 #include "piglit-util.h"
  35
  36 int piglit_width = 100, piglit_height = 100;
  37 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  38
  39 static int bump_density_location, bump_size_location;
  40 static int specular_factor_location, surface_color_location;
  41 static int light_position_location, tangent_attrib;
  42 static GLint prog;
  43
  44 enum piglit_result
  45 piglit_display(void)
  46 {
  47         GLboolean pass = GL_TRUE;
  48         static const float surface_color[3] = {0.7, 0.6, 0.18};
  49         static const float test_specular[3] = {0.976, 0.894, 0.549};
  50         static const float test_nonspecular[3] = {0.572, 0.490, 0.145};
  51         static const float test_bump_dark[3] = {0.411, 0.352, 0.105};
  52         static const float test_bump_light[3] = {1.0, 0.961, 0.557};
  53         float light_position[3] = {-1.0, -1.0, 2.0};
  54         float w = piglit_width;
  55         float h = piglit_height;
  56         float bump_x = w * 3 / 8;
  57         float bump_y = h * 3 / 8;
  58         float x, y;
  59
  60         piglit_ortho_projection(1, 1, GL_FALSE);
  61
  62         glClearColor(0.5, 0.5, 0.5, 0.5);
  63         glClear(GL_COLOR_BUFFER_BIT);
  64
  65         glUniform1f(bump_density_location, 4);
  66         glUniform1f(bump_size_location, 0.15);
  67         glUniform1f(specular_factor_location, 0.5);
  68         glUniform3fv(surface_color_location, 1, surface_color);
  69         glUniform3fv(light_position_location, 1, light_position);
  70
  71         glTranslatef(0, 0, -0.5);
  72         glNormal3f(0.0, 0.0, 1.0);
  73         glVertexAttrib3f(tangent_attrib, 1.0, 0.0, 0.0);
  74         for (x = 0.0; x < 1.0; x += 0.1) {
  75                 for (y = 0.0; y < 1.0; y += 0.1) {
  76                         piglit_draw_rect_tex(x, y, 0.1, 0.1,
  77                                              x, y, 0.1, 0.1);
  78                 }
  79         }
  80
  81         /* Corners of the image: A highly specular point, and a
  82          * non-specular point.
  83          */
  84         pass &= piglit_probe_pixel_rgb(0, 0, test_specular);
  85         pass &= piglit_probe_pixel_rgb(piglit_width - 1, piglit_height - 1,
  86                                        test_nonspecular);
  87
  88         /* Look at a bump -- does it have a lit part and an unlit part? */
  89         pass &= piglit_probe_pixel_rgb(bump_x + w / 16, bump_y + h / 16,
  90                                        test_bump_dark);
  91         pass &= piglit_probe_pixel_rgb(bump_x - w / 16, bump_y - h / 16,
  92                                        test_bump_light);
  93
  94         glutSwapBuffers();
  95
  96         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
  97 }
  98
  99 void
 100 piglit_init(int argc, char **argv)
 101 {
 102         GLint vs, fs;
 103
 104         if (!GLEW_VERSION_2_0) {
 105                 printf("Requires OpenGL 2.0\n");
 106                 piglit_report_result(PIGLIT_SKIP);
 107         }
 108
 109         vs = piglit_compile_shader(GL_VERTEX_SHADER,
 110                                    "shaders/glsl-orangebook-ch06-bump.vert");
 111         fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
 112                                    "shaders/glsl-orangebook-ch06-bump.frag");
 113
 114         prog = piglit_link_simple_program(vs, fs);
 115
 116         glUseProgram(prog);
 117
 118         bump_density_location = glGetUniformLocation(prog, "BumpDensity");
 119         bump_size_location = glGetUniformLocation(prog, "BumpSize");
 120         specular_factor_location = glGetUniformLocation(prog, "SpecularFactor");
 121         surface_color_location = glGetUniformLocation(prog, "SurfaceColor");
 122         light_position_location = glGetUniformLocation(prog, "LightPosition");
 123         assert(bump_density_location != -1);
 124         assert(bump_size_location != -1);
 125         assert(specular_factor_location != -1);
 126         assert(surface_color_location != -1);
 127         assert(light_position_location != -1);
 128
 129         tangent_attrib = glGetAttribLocation(prog, "Tangent");
 130         assert(tangent_attrib != -1);
 131 }