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 #if 0
  35 static void
  36 line(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
  37 {
  38         glBegin(GL_LINES);
  39         glVertex2f(x1, y1);
  40         glVertex2f(x2, y2);
  41         glEnd();
  42 }
  43 #endif
  44
  45 static void
  46 line3(GLfloat x1, GLfloat y1, GLfloat z1, GLfloat x2, GLfloat y2, GLfloat z2)
  47 {
  48         glBegin(GL_LINES);
  49         glVertex3f(x1, y1, z1);
  50         glVertex3f(x2, y2, z2);
  51         glEnd();
  52 }
  53
  54 static void
  55 display(void)
  56 {
  57         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
  58
  59         glClearColor(0.0, 0.0, 0.0, 0.0);
  60         glClear(GL_COLOR_BUFFER_BIT);
  61
  62         glColor3f(1.0, 0.0, 0.0);
  63         /* clipped along xmin */
  64         glBegin(GL_TRIANGLES);
  65         glVertex2f(-20, win_height / 2 - 20);
  66         glVertex2f(20, win_height / 2);
  67         glVertex2f(-20, win_height / 2 + 20);
  68         glEnd();
  69
  70         glColor3f(0.0, 1.0, 0.0);
  71         /* clipped along ymax */
  72         glBegin(GL_TRIANGLES);
  73         glVertex2f(win_height / 2 - 20, win_height + 20);
  74         glVertex2f(win_height / 2,      win_height - 20);
  75         glVertex2f(win_height / 2 + 20, win_height + 20);
  76         glEnd();
  77
  78         glColor3f(0.0, 0.0, 1.0);
  79         /* clipped along xmax */
  80         glBegin(GL_TRIANGLES);
  81         glVertex2f(win_height + 20, win_height / 2 - 20);
  82         glVertex2f(win_height - 20, win_height / 2);
  83         glVertex2f(win_height + 20, win_height / 2 + 20);
  84         glEnd();
  85
  86         glColor3f(1.0, 1.0, 1.0);
  87         /* clipped along ymin */
  88         glBegin(GL_TRIANGLES);
  89         glVertex2f(win_height / 2 - 20, -20);
  90         glVertex2f(win_height / 2,       20);
  91         glVertex2f(win_height / 2 + 20, -20);
  92         glEnd();
  93
  94         /* clipped along near */
  95         glColor3f(1.0, 0.0, 1.0);
  96         glBegin(GL_TRIANGLES);
  97         glVertex3f(win_width / 2 - 20, win_height / 2 - 20,  0.5);
  98         glVertex3f(win_width / 2 - 40, win_height / 2,      -0.5);
  99         glVertex3f(win_width / 2 - 20, win_height / 2 + 20,  0.5);
 100         glEnd();
 101
 102         /* clipped along far */
 103         glColor3f(0.0, 1.0, 1.0);
 104         glBegin(GL_TRIANGLES);
 105         glVertex3f(win_width / 2 + 20, win_height / 2 - 20, 0.5);
 106         glVertex3f(win_width / 2 + 40, win_height / 2,      1.5);
 107         glVertex3f(win_width / 2 + 20, win_height / 2 + 20, 0.5);
 108         glEnd();
 109
 110         /* entirely clipped along near/far */
 111         glColor3f(.5, .5, .5);
 112         glBegin(GL_TRIANGLES);
 113         glVertex3f(win_width / 2 - 20, win_height / 2 + 20, -0.5);
 114         glVertex3f(win_width / 2,      win_height / 2 + 40, -0.5);
 115         glVertex3f(win_width / 2 + 20, win_height / 2 + 20, -0.5);
 116         glEnd();
 117
 118         glBegin(GL_TRIANGLES);
 119         glVertex3f(win_width / 2 - 20, win_height / 2 - 20, 1.5);
 120         glVertex3f(win_width / 2,      win_height / 2 - 40, 1.5);
 121         glVertex3f(win_width / 2 + 20, win_height / 2 - 20, 1.5);
 122         glEnd();
 123
 124         glColor3f(.5, .5, .5);
 125         line3(win_width / 2, win_height / 2 - 20, 1.5,
 126               win_width / 2, win_height / 2 + 20, 1.5);
 127
 128         glColor3f(1.0, 1.0, 0.0);
 129         /* clipped along both x and y limits */
 130         glBegin(GL_TRIANGLES); /* xmin, ymin */
 131         glVertex2f(-5, 20);
 132         glVertex2f(20, 20);
 133         glVertex2f(20, -5);
 134         glEnd();
 135         glBegin(GL_TRIANGLES); /* xmin, ymax */
 136         glVertex2f(-5, win_height - 20);
 137         glVertex2f(20, win_height - 20);
 138         glVertex2f(20, win_height + 5);
 139         glEnd();
 140         glBegin(GL_TRIANGLES); /* xmax, ymax */
 141         glVertex2f(win_width - 20, win_height + 5);
 142         glVertex2f(win_width - 20, win_height - 20);
 143         glVertex2f(win_width + 5,  win_height - 20);
 144         glEnd();
 145         glBegin(GL_TRIANGLES); /* xmax, ymin */
 146         glVertex2f(win_width + 5, 20);
 147         glVertex2f(win_width - 20, 20);
 148         glVertex2f(win_width - 20, -5);
 149         glEnd();
 150
 151         glutSwapBuffers();
 152 }
 153
 154 static void
 155 reshape(int width, int height)
 156 {
 157         win_width = width;
 158         win_height = height;
 159         glViewport(0, 0, width, height);
 160
 161         glMatrixMode(GL_PROJECTION);
 162         glLoadIdentity();
 163         glOrtho(0, win_width, 0, win_height, 0.0, -1.0);
 164
 165         glMatrixMode(GL_MODELVIEW);
 166         glLoadIdentity();
 167         glTranslatef(.25, .25, 0);
 168 }
 169
 170 static void key( unsigned char key, int x, int y )
 171 {
 172         (void) x;
 173         (void) y;
 174
 175         switch (key) {
 176         case 27: /* esc */
 177                 exit(0);
 178                 break;
 179         }
 180
 181         glutPostRedisplay();
 182 }
 183
 184 static void
 185 init(void)
 186 {
 187 }
 188
 189 int
 190 main(int argc, char *argv[])
 191 {
 192         win_width = 200;
 193         win_height = 200;
 194
 195         glutInit(&argc, argv);
 196         glutInitWindowPosition(0, 0);
 197         glutInitWindowSize(win_width, win_height);
 198         glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
 199         glutCreateWindow(argv[0]);
 200         glewInit();
 201         glutReshapeFunc(reshape);
 202         glutKeyboardFunc(key);
 203         glutDisplayFunc(display);
 204
 205         init();
 206
 207         glutMainLoop();
 208         return 0;
 209 }