+++ /dev/null
-/*
- * Copyright (c) 1993-1997, Silicon Graphics, Inc.
- * ALL RIGHTS RESERVED
- * Permission to use, copy, modify, and distribute this software for
- * any purpose and without fee is hereby granted, provided that the above
- * copyright notice appear in all copies and that both the copyright notice
- * and this permission notice appear in supporting documentation, and that
- * the name of Silicon Graphics, Inc. not be used in advertising
- * or publicity pertaining to distribution of the software without specific,
- * written prior permission.
- *
- * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "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, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
- * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
- * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
- * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
- * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
- * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
- * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * US Government Users Restricted Rights
- * Use, duplication, or disclosure by the Government is subject to
- * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
- * (c)(1)(ii) of the Rights in Technical Data and Computer Software
- * clause at DFARS 252.227-7013 and/or in similar or successor
- * clauses in the FAR or the DOD or NASA FAR Supplement.
- * Unpublished-- rights reserved under the copyright laws of the
- * United States. Contractor/manufacturer is Silicon Graphics,
- * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
- *
- * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
- */
-
-#include <GL/glut.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-static int leftFirst = GL_TRUE;
-
-static struct { GLenum func; const char *str; } funcs[] =
- {
- { GL_LESS, "GL_LESS" },
- { GL_LEQUAL, "GL_LEQUAL" },
- { GL_GREATER, "GL_GREATER" },
- { GL_GEQUAL, "GL_GEQUAL" },
- { GL_EQUAL, "GL_EQUAL" },
- { GL_NOTEQUAL, "GL_NOTEQUAL" },
- { GL_ALWAYS, "GL_ALWAYS" },
- { GL_NEVER, "GL_NEVER" },
- };
-
-#define NUM_FUNCS (sizeof(funcs) / sizeof(funcs[0]))
-
-static int curFunc = 0;
-static double clearVal = 1.0;
-static float minZ = 0.0;
-static float maxZ = 1.0;
-
-static void usage(void)
-{
- printf("t - toggle rendering order of triangles\n");
- printf("c - toggle Z clear value between 0, 1\n");
- printf("f - cycle through depth test functions\n");
- printf("n/N - decrease/increase depthrange minZ\n");
- printf("x/X - decrease/increase depthrange maxZ\n");
- printf("spc - reset\n");
- printf("z - set to reverse-direction (ztrick) mode\n");
- fflush(stdout);
-}
-
-
-static void init(void)
-{
- glEnable(GL_DEPTH_TEST);
- glClearColor (1.0, 0.0, 0.0, 0.0);
-}
-
-static void drawLeftTriangle(void)
-{
- /* draw yellow triangle on LHS of screen */
- glBegin (GL_TRIANGLES);
- glColor4f(1.0, 1.0, 0.0, 0.75);
- glVertex3f(0.1, 0.9, -1.0);
- glVertex3f(0.1, 0.1, -1.0);
- glVertex3f(0.8, 0.5, 1.0);
- glEnd();
-}
-
-static void drawRightTriangle(void)
-{
- /* draw cyan triangle on RHS of screen */
- glBegin (GL_TRIANGLES);
- glColor4f(0.0, 1.0, 1.0, 0.75);
- glVertex3f(0.9, 0.9, 0.0);
- glVertex3f(0.2, 0.5, 0.0);
- glVertex3f(0.9, 0.1, 0.0);
- glEnd();
-}
-
-static void display(void)
-{
- printf("GL_CLEAR_DEPTH = %.2f, GL_DEPTH_FUNC = %s, DepthRange(%.1f, %.1f)\n",
- clearVal, funcs[curFunc].str, minZ, maxZ);
- fflush(stdout);
- glClearDepth(clearVal);
- glDepthRange(minZ, maxZ);
- glDepthFunc(funcs[curFunc].func);
-
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
- if (leftFirst) {
- drawLeftTriangle();
- drawRightTriangle();
- }
- else {
- drawRightTriangle();
- drawLeftTriangle();
- }
-
- glFlush();
-}
-
-static void reshape(int w, int h)
-{
- glViewport(0, 0, (GLsizei) w, (GLsizei) h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- if (w <= h)
- gluOrtho2D (0.0, 1.0, 0.0, 1.0*(GLfloat)h/(GLfloat)w);
- else
- gluOrtho2D (0.0, 1.0*(GLfloat)w/(GLfloat)h, 0.0, 1.0);
-}
-
-/* ARGSUSED1 */
-static void keyboard(unsigned char key, int x, int y)
-{
- switch (key) {
- case 'n':
- minZ -= .1;
- break;
- case 'N':
- minZ += .1;
- break;
- case 'x':
- maxZ -= .1;
- break;
- case 'X':
- maxZ += .1;
- break;
- case 'c':
- case 'C':
- clearVal = 1.0 - clearVal;
- break;
- case 'f':
- case 'F':
- curFunc = (curFunc + 1) % NUM_FUNCS;
- break;
- case 't':
- case 'T':
- leftFirst = !leftFirst;
- break;
- case ' ':
- curFunc = 0;
- clearVal = 1.0;
- minZ = 0.0;
- maxZ = 1.0;
- break;
- case 'z':
- curFunc = 2;
- clearVal = 0.0;
- minZ = 1.0;
- maxZ = 0.0;
- break;
- case 27: /* Escape key */
- exit(0);
- break;
- default:
- return;
- }
- glutPostRedisplay();
-}
-
-/* Main Loop
- * Open window with initial window size, title bar,
- * RGBA display mode, and handle input events.
- */
-int main(int argc, char** argv)
-{
- glutInit(&argc, argv);
- glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
- glutInitWindowSize (200, 200);
- glutCreateWindow (argv[0]);
- glutReshapeFunc (reshape);
- glutKeyboardFunc (keyboard);
- glutDisplayFunc (display);
- init();
- usage();
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff