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Diffstat (limited to 'progs/tests/lineclip.c')
| -rw-r--r-- | progs/tests/lineclip.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/progs/tests/lineclip.c b/progs/tests/lineclip.c new file mode 100644 index 0000000000..098f5e92eb --- /dev/null +++ b/progs/tests/lineclip.c @@ -0,0 +1,175 @@ +/* + * Copyright © 2008 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + * + * Authors: + * Eric Anholt <eric@anholt.net> + * + */ + +#include <stdlib.h> +#include <GL/glut.h> + +static int win_width, win_height; + +static void +line(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2) +{ + glBegin(GL_LINES); + glVertex2f(x1, y1); + glVertex2f(x2, y2); + glEnd(); +} + +static void +line3(GLfloat x1, GLfloat y1, GLfloat z1, GLfloat x2, GLfloat y2, GLfloat z2) +{ + glBegin(GL_LINES); + glVertex3f(x1, y1, z1); + glVertex3f(x2, y2, z2); + glEnd(); +} + +static void +display(void) +{ + glClearColor(0.0, 0.0, 0.0, 0.0); + glClear(GL_COLOR_BUFFER_BIT); + + glColor3f(1.0, 0.0, 0.0); + /* 2 lines clipped along xmin */ + line(-20, win_height / 2 - 20, + 20, win_height / 2 - 20); + line( 20, win_height / 2 + 20, + -20, win_height / 2 + 20); + + glColor3f(0.0, 1.0, 0.0); + /* 2 lines clipped along ymax */ + line(win_width / 2 - 20, win_height + 20, + win_width / 2 - 20, win_height - 20); + line(win_width / 2 + 20, win_height - 20, + win_width / 2 + 20, win_height + 20); + + glColor3f(0.0, 0.0, 1.0); + /* 2 lines clipped along xmax */ + line(win_width - 20, win_height / 2 - 20, + win_width + 20, win_height / 2 - 20); + line(win_width + 20, win_height / 2 + 20, + win_width - 20, win_height / 2 + 20); + + glColor3f(1.0, 1.0, 1.0); + /* 2 lines clipped along ymin */ + line(win_width / 2 - 20, 20, + win_width / 2 - 20, -20); + line(win_width / 2 + 20, -20, + win_width / 2 + 20, 20); + + /* 2 lines clipped along near */ + glColor3f(1.0, 0.0, 1.0); + line3(win_width / 2 - 20 - 20, win_height / 2, 0.5, + win_width / 2 - 20 + 20, win_height / 2, -0.5); + line3(win_width / 2 - 20, win_height / 2 - 20, -0.5, + win_width / 2 - 20, win_height / 2 + 20, 0.5); + + /* 2 lines clipped along far */ + glColor3f(0.0, 1.0, 1.0); + line3(win_width / 2 + 20 - 20, win_height / 2, 1.5, + win_width / 2 + 20 + 20, win_height / 2, 0.5); + line3(win_width / 2 + 20, win_height / 2 - 20, 0.5, + win_width / 2 + 20, win_height / 2 + 20, 1.5); + + /* entirely clipped along near/far */ + glColor3f(.5, .5, .5); + line3(win_width / 2, win_height / 2 - 20, -0.5, + win_width / 2, win_height / 2 + 20, -0.5); + glColor3f(.5, .5, .5); + line3(win_width / 2, win_height / 2 - 20, 1.5, + win_width / 2, win_height / 2 + 20, 1.5); + + glColor3f(1.0, 1.0, 0.0); + /* lines clipped along both x and y limits */ + line(-5, 20, + 20, -5); /* xmin, ymin */ + line(-5, win_height - 20, + 20, win_height + 5); /* xmin, ymax */ + line(win_width - 20, -5, + win_width + 5, 20); /* xmax, ymin */ + line(win_width - 20, win_height + 5, + win_width + 5, win_height - 20); /* xmax, ymax */ + + glutSwapBuffers(); +} + +static void +reshape(int width, int height) +{ + win_width = width; + win_height = height; + glViewport(0, 0, width, height); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(0, win_width, 0, win_height, 0.0, -1.0); + + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(.25, .25, 0); +} + +static void key( unsigned char key, int x, int y ) +{ + (void) x; + (void) y; + + switch (key) { + case 27: /* esc */ + exit(0); + break; + } + + glutPostRedisplay(); +} + +static void +init(void) +{ +} + +int +main(int argc, char *argv[]) +{ + win_width = 200; + win_height = 200; + + glutInit(&argc, argv); + glutInitWindowPosition(0, 0); + glutInitWindowSize(win_width, win_height); + glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); + glutCreateWindow(argv[0]); + glutReshapeFunc(reshape); + glutKeyboardFunc(key); + glutDisplayFunc(display); + + init(); + + glutMainLoop(); + return 0; +} |