progs/tests/unfilledclip.c

   1 /*
   2  * Copyright © 2008 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 #include <stdlib.h>
  29 #include <GL/glew.h>
  30 #include <GL/glut.h>
  31
  32 static int win_width, win_height;
  33
  34 static void
  35 line(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
  36 {
  37         glBegin(GL_LINES);
  38         glVertex2f(x1, y1);
  39         glVertex2f(x2, y2);
  40         glEnd();
  41 }
  42
  43 static void
  44 line3(GLfloat x1, GLfloat y1, GLfloat z1, GLfloat x2, GLfloat y2, GLfloat z2)
  45 {
  46         glBegin(GL_LINES);
  47         glVertex3f(x1, y1, z1);
  48         glVertex3f(x2, y2, z2);
  49         glEnd();
  50 }
  51
  52 static void
  53 display(void)
  54 {
  55         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
  56
  57         glClearColor(0.0, 0.0, 0.0, 0.0);
  58         glClear(GL_COLOR_BUFFER_BIT);
  59
  60         glColor3f(1.0, 0.0, 0.0);
  61         /* clipped along xmin */
  62         glBegin(GL_TRIANGLES);
  63         glVertex2f(-20, win_height / 2 - 20);
  64         glVertex2f(20, win_height / 2);
  65         glVertex2f(-20, win_height / 2 + 20);
  66         glEnd();
  67
  68         glColor3f(0.0, 1.0, 0.0);
  69         /* clipped along ymax */
  70         glBegin(GL_TRIANGLES);
  71         glVertex2f(win_height / 2 - 20, win_height + 20);
  72         glVertex2f(win_height / 2,      win_height - 20);
  73         glVertex2f(win_height / 2 + 20, win_height + 20);
  74         glEnd();
  75
  76         glColor3f(0.0, 0.0, 1.0);
  77         /* clipped along xmax */
  78         glBegin(GL_TRIANGLES);
  79         glVertex2f(win_height + 20, win_height / 2 - 20);
  80         glVertex2f(win_height - 20, win_height / 2);
  81         glVertex2f(win_height + 20, win_height / 2 + 20);
  82         glEnd();
  83
  84         glColor3f(1.0, 1.0, 1.0);
  85         /* clipped along ymin */
  86         glBegin(GL_TRIANGLES);
  87         glVertex2f(win_height / 2 - 20, -20);
  88         glVertex2f(win_height / 2,       20);
  89         glVertex2f(win_height / 2 + 20, -20);
  90         glEnd();
  91
  92         /* clipped along near */
  93         glColor3f(1.0, 0.0, 1.0);
  94         glBegin(GL_TRIANGLES);
  95         glVertex3f(win_width / 2 - 20, win_height / 2 - 20,  0.5);
  96         glVertex3f(win_width / 2 - 40, win_height / 2,      -0.5);
  97         glVertex3f(win_width / 2 - 20, win_height / 2 + 20,  0.5);
  98         glEnd();
  99
 100         /* clipped along far */
 101         glColor3f(0.0, 1.0, 1.0);
 102         glBegin(GL_TRIANGLES);
 103         glVertex3f(win_width / 2 + 20, win_height / 2 - 20, 0.5);
 104         glVertex3f(win_width / 2 + 40, win_height / 2,      1.5);
 105         glVertex3f(win_width / 2 + 20, win_height / 2 + 20, 0.5);
 106         glEnd();
 107
 108         /* entirely clipped along near/far */
 109         glColor3f(.5, .5, .5);
 110         glBegin(GL_TRIANGLES);
 111         glVertex3f(win_width / 2 - 20, win_height / 2 + 20, -0.5);
 112         glVertex3f(win_width / 2,      win_height / 2 + 40, -0.5);
 113         glVertex3f(win_width / 2 + 20, win_height / 2 + 20, -0.5);
 114         glEnd();
 115
 116         glBegin(GL_TRIANGLES);
 117         glVertex3f(win_width / 2 - 20, win_height / 2 - 20, 1.5);
 118         glVertex3f(win_width / 2,      win_height / 2 - 40, 1.5);
 119         glVertex3f(win_width / 2 + 20, win_height / 2 - 20, 1.5);
 120         glEnd();
 121
 122         glColor3f(.5, .5, .5);
 123         line3(win_width / 2, win_height / 2 - 20, 1.5,
 124               win_width / 2, win_height / 2 + 20, 1.5);
 125
 126         glColor3f(1.0, 1.0, 0.0);
 127         /* clipped along both x and y limits */
 128         glBegin(GL_TRIANGLES); /* xmin, ymin */
 129         glVertex2f(-5, 20);
 130         glVertex2f(20, 20);
 131         glVertex2f(20, -5);
 132         glEnd();
 133         glBegin(GL_TRIANGLES); /* xmin, ymax */
 134         glVertex2f(-5, win_height - 20);
 135         glVertex2f(20, win_height - 20);
 136         glVertex2f(20, win_height + 5);
 137         glEnd();
 138         glBegin(GL_TRIANGLES); /* xmax, ymax */
 139         glVertex2f(win_width - 20, win_height + 5);
 140         glVertex2f(win_width - 20, win_height - 20);
 141         glVertex2f(win_width + 5,  win_height - 20);
 142         glEnd();
 143         glBegin(GL_TRIANGLES); /* xmax, ymin */
 144         glVertex2f(win_width + 5, 20);
 145         glVertex2f(win_width - 20, 20);
 146         glVertex2f(win_width - 20, -5);
 147         glEnd();
 148
 149         glutSwapBuffers();
 150 }
 151
 152 static void
 153 reshape(int width, int height)
 154 {
 155         win_width = width;
 156         win_height = height;
 157         glViewport(0, 0, width, height);
 158
 159         glMatrixMode(GL_PROJECTION);
 160         glLoadIdentity();
 161         glOrtho(0, win_width, 0, win_height, 0.0, -1.0);
 162
 163         glMatrixMode(GL_MODELVIEW);
 164         glLoadIdentity();
 165         glTranslatef(.25, .25, 0);
 166 }
 167
 168 static void key( unsigned char key, int x, int y )
 169 {
 170         (void) x;
 171         (void) y;
 172
 173         switch (key) {
 174         case 27: /* esc */
 175                 exit(0);
 176                 break;
 177         }
 178
 179         glutPostRedisplay();
 180 }
 181
 182 static void
 183 init(void)
 184 {
 185 }
 186
 187 int
 188 main(int argc, char *argv[])
 189 {
 190         win_width = 200;
 191         win_height = 200;
 192
 193         glutInit(&argc, argv);
 194         glutInitWindowPosition(0, 0);
 195         glutInitWindowSize(win_width, win_height);
 196         glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
 197         glutCreateWindow(argv[0]);
 198         glewInit();
 199         glutReshapeFunc(reshape);
 200         glutKeyboardFunc(key);
 201         glutDisplayFunc(display);
 202
 203         init();
 204
 205         glutMainLoop();
 206         return 0;
 207 }