blob: e5a68ffabd36b672f915497a40c3ad6a99050c78 [file] [log] [blame]
/*
* Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
* Copyright (c) 2009 VMware, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the name of
* Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
* ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <GL/glut.h>
struct program
{
unsigned width;
unsigned height;
unsigned quads;
};
struct program prog;
static void init(void)
{
fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
fflush(stderr);
}
static void reshape(int width, int height)
{
glViewport(0, 0, (GLint)width, (GLint)height);
prog.width = width;
prog.height = height;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
glMatrixMode(GL_MODELVIEW);
}
static void key(unsigned char key, int x, int y)
{
switch (key) {
case 27:
exit(1);
default:
prog.quads = !prog.quads;
glutPostRedisplay();
return;
}
}
static void drawQuad(void)
{
if (prog.quads) {
glBegin(GL_QUADS);
glVertex2d(-1.0, -1.0);
glVertex2d( 1.0, -1.0);
glVertex2d( 1.0, 1.0);
glVertex2d(-1.0, 1.0);
glEnd();
} else {
glClear(GL_COLOR_BUFFER_BIT);
}
}
static void draw(void)
{
glClearColor(0.0, 0.0, 1.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
printf("drawing with %s\n", prog.quads ? "quads" : "clears");
glEnable(GL_SCISSOR_TEST);
{
glClearColor(1.0, 0.0, 0.0, 1.0);
glColor4d(1.0, 0.0, 0.0, 1.0);
glScissor(1, 1, 10, 10);
drawQuad();
glScissor(1, prog.height - 11, 10, 10);
drawQuad();
glScissor(prog.width - 11, prog.height - 11, 10, 10);
drawQuad();
}
{
glClearColor(0.0, 1.0, 0.0, 1.0);
glColor4d(0.0, 1.0, 0.0, 1.0);
glScissor(12, 1, 10, 10);
drawQuad();
glScissor(12, prog.height - 11, 10, 10);
drawQuad();
glScissor(prog.width - 22, prog.height - 11, 10, 10);
drawQuad();
}
{
glClearColor(1.0, 1.0, 0.0, 1.0);
glColor4d(1.0, 1.0, 0.0, 1.0);
glScissor(1, 12, 10, 10);
drawQuad();
glScissor(1, prog.height - 22, 10, 10);
drawQuad();
glScissor(prog.width - 11, prog.height - 22, 10, 10);
drawQuad();
}
glDisable(GL_SCISSOR_TEST);
/* glutSwapBuffers(); */
glFlush();
}
int main(int argc, char **argv)
{
GLenum type;
glutInit(&argc, argv);
prog.width = 200;
prog.height = 200;
glutInitWindowPosition(100, 0);
glutInitWindowSize(prog.width, prog.height);
/* type = GLUT_RGB | GLUT_DOUBLE; */
type = GLUT_RGB | GLUT_SINGLE;
glutInitDisplayMode(type);
if (glutCreateWindow(*argv) == GL_FALSE) {
exit(1);
}
init();
glutReshapeFunc(reshape);
glutKeyboardFunc(key);
glutDisplayFunc(draw);
glutMainLoop();
return 0;
}