| /* |
| * 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/glew.h> |
| #include <GL/glut.h> |
| |
| static int win_width, win_height; |
| |
| #if 0 |
| static void |
| line(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2) |
| { |
| glBegin(GL_LINES); |
| glVertex2f(x1, y1); |
| glVertex2f(x2, y2); |
| glEnd(); |
| } |
| #endif |
| |
| 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) |
| { |
| glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); |
| |
| glClearColor(0.0, 0.0, 0.0, 0.0); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| glColor3f(1.0, 0.0, 0.0); |
| /* clipped along xmin */ |
| glBegin(GL_TRIANGLES); |
| glVertex2f(-20, win_height / 2 - 20); |
| glVertex2f(20, win_height / 2); |
| glVertex2f(-20, win_height / 2 + 20); |
| glEnd(); |
| |
| glColor3f(0.0, 1.0, 0.0); |
| /* clipped along ymax */ |
| glBegin(GL_TRIANGLES); |
| glVertex2f(win_height / 2 - 20, win_height + 20); |
| glVertex2f(win_height / 2, win_height - 20); |
| glVertex2f(win_height / 2 + 20, win_height + 20); |
| glEnd(); |
| |
| glColor3f(0.0, 0.0, 1.0); |
| /* clipped along xmax */ |
| glBegin(GL_TRIANGLES); |
| glVertex2f(win_height + 20, win_height / 2 - 20); |
| glVertex2f(win_height - 20, win_height / 2); |
| glVertex2f(win_height + 20, win_height / 2 + 20); |
| glEnd(); |
| |
| glColor3f(1.0, 1.0, 1.0); |
| /* clipped along ymin */ |
| glBegin(GL_TRIANGLES); |
| glVertex2f(win_height / 2 - 20, -20); |
| glVertex2f(win_height / 2, 20); |
| glVertex2f(win_height / 2 + 20, -20); |
| glEnd(); |
| |
| /* clipped along near */ |
| glColor3f(1.0, 0.0, 1.0); |
| glBegin(GL_TRIANGLES); |
| glVertex3f(win_width / 2 - 20, win_height / 2 - 20, 0.5); |
| glVertex3f(win_width / 2 - 40, win_height / 2, -0.5); |
| glVertex3f(win_width / 2 - 20, win_height / 2 + 20, 0.5); |
| glEnd(); |
| |
| /* clipped along far */ |
| glColor3f(0.0, 1.0, 1.0); |
| glBegin(GL_TRIANGLES); |
| glVertex3f(win_width / 2 + 20, win_height / 2 - 20, 0.5); |
| glVertex3f(win_width / 2 + 40, win_height / 2, 1.5); |
| glVertex3f(win_width / 2 + 20, win_height / 2 + 20, 0.5); |
| glEnd(); |
| |
| /* entirely clipped along near/far */ |
| glColor3f(.5, .5, .5); |
| glBegin(GL_TRIANGLES); |
| glVertex3f(win_width / 2 - 20, win_height / 2 + 20, -0.5); |
| glVertex3f(win_width / 2, win_height / 2 + 40, -0.5); |
| glVertex3f(win_width / 2 + 20, win_height / 2 + 20, -0.5); |
| glEnd(); |
| |
| glBegin(GL_TRIANGLES); |
| glVertex3f(win_width / 2 - 20, win_height / 2 - 20, 1.5); |
| glVertex3f(win_width / 2, win_height / 2 - 40, 1.5); |
| glVertex3f(win_width / 2 + 20, win_height / 2 - 20, 1.5); |
| glEnd(); |
| |
| 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); |
| /* clipped along both x and y limits */ |
| glBegin(GL_TRIANGLES); /* xmin, ymin */ |
| glVertex2f(-5, 20); |
| glVertex2f(20, 20); |
| glVertex2f(20, -5); |
| glEnd(); |
| glBegin(GL_TRIANGLES); /* xmin, ymax */ |
| glVertex2f(-5, win_height - 20); |
| glVertex2f(20, win_height - 20); |
| glVertex2f(20, win_height + 5); |
| glEnd(); |
| glBegin(GL_TRIANGLES); /* xmax, ymax */ |
| glVertex2f(win_width - 20, win_height + 5); |
| glVertex2f(win_width - 20, win_height - 20); |
| glVertex2f(win_width + 5, win_height - 20); |
| glEnd(); |
| glBegin(GL_TRIANGLES); /* xmax, ymin */ |
| glVertex2f(win_width + 5, 20); |
| glVertex2f(win_width - 20, 20); |
| glVertex2f(win_width - 20, -5); |
| glEnd(); |
| |
| 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]); |
| glewInit(); |
| glutReshapeFunc(reshape); |
| glutKeyboardFunc(key); |
| glutDisplayFunc(display); |
| |
| init(); |
| |
| glutMainLoop(); |
| return 0; |
| } |