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