+++ /dev/null
-/*
- * Copyright (c) 1993-2003, 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 Unpublished - rights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.
- * 1500 Crittenden Lane
- * Mountain View, CA 94043
- * United State of America
- *
- * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
- */
-
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-/*#include "helpers.h"*/
-
-#define SHADOW_MAP_WIDTH 256
-#define SHADOW_MAP_HEIGHT 256
-
-#define PI 3.14159265359
-
-GLdouble fovy = 60.0;
-GLdouble nearPlane = 10.0;
-GLdouble farPlane = 100.0;
-
-GLfloat angle = 0.0;
-GLfloat torusAngle = 0.0;
-
-GLfloat lightPos[] = { 25.0, 25.0, 25.0, 1.0 };
-GLfloat lookat[] = { 0.0, 0.0, 0.0 };
-GLfloat up[] = { 0.0, 0.0, 1.0 };
-
-GLboolean showShadow = GL_FALSE;
-
-static void
-init( void )
-{
- GLfloat white[] = { 1.0, 1.0, 1.0, 1.0 };
-
- glTexImage2D( GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
- SHADOW_MAP_WIDTH, SHADOW_MAP_HEIGHT, 0,
- GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL );
-
- glLightfv( GL_LIGHT0, GL_POSITION, lightPos );
- glLightfv( GL_LIGHT0, GL_SPECULAR, white );
- glLightfv( GL_LIGHT0, GL_DIFFUSE, white );
-
- glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
- glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
- glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
- glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
- glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL );
- glTexParameteri( GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE, GL_LUMINANCE );
- glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE,
- GL_COMPARE_R_TO_TEXTURE );
-
- glTexGeni( GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
- glTexGeni( GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
- glTexGeni( GL_R, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
- glTexGeni( GL_Q, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR );
-
- glColorMaterial( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE );
-
- glCullFace( GL_BACK );
-
- glEnable( GL_DEPTH_TEST );
- glEnable( GL_LIGHT0 );
- glEnable( GL_LIGHTING );
- glEnable( GL_TEXTURE_2D );
- glEnable( GL_TEXTURE_GEN_S );
- glEnable( GL_TEXTURE_GEN_T );
- glEnable( GL_TEXTURE_GEN_R );
- glEnable( GL_TEXTURE_GEN_Q );
- glEnable( GL_COLOR_MATERIAL );
- glEnable( GL_CULL_FACE );
-}
-
-static void
-reshape( int width, int height )
-{
- glViewport( 0, 0, width, height );
-
- glMatrixMode( GL_PROJECTION );
- glLoadIdentity();
- gluPerspective( fovy, (GLdouble) width/height, nearPlane, farPlane );
- glMatrixMode( GL_MODELVIEW );
-}
-
-static void
-idle( void )
-{
- angle += PI / 10000;
- torusAngle += .1;
- glutPostRedisplay();
-}
-
-static void
-keyboard( unsigned char key, int x, int y )
-{
- switch( key ) {
- case 27: /* Escape */
- exit( 0 );
- break;
-
- case 't': {
- static GLboolean textureOn = GL_TRUE;
- textureOn = !textureOn;
- if ( textureOn )
- glEnable( GL_TEXTURE_2D );
- else
- glDisable( GL_TEXTURE_2D );
- }
- break;
-
- case 'm': {
- static GLboolean compareMode = GL_TRUE;
- compareMode = !compareMode;
- printf( "Compare mode %s\n", compareMode ? "On" : "Off" );
- glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE,
- compareMode ? GL_COMPARE_R_TO_TEXTURE : GL_NONE );
- }
- break;
-
- case 'f': {
- static GLboolean funcMode = GL_TRUE;
- funcMode = !funcMode;
- printf( "Operator %s\n", funcMode ? "GL_LEQUAL" : "GL_GEQUAL" );
- glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC,
- funcMode ? GL_LEQUAL : GL_GEQUAL );
- }
- break;
-
- case 's':
- showShadow = !showShadow;
- break;
-
- case 'p': {
- static GLboolean animate = GL_TRUE;
- animate = !animate;
- glutIdleFunc( animate ? idle : NULL );
- }
- break;
- }
-
- glutPostRedisplay();
-}
-
-static void
-transposeMatrix( GLfloat m[16] )
-{
- GLfloat tmp;
-#define Swap( a, b ) tmp = a; a = b; b = tmp
- Swap( m[1], m[4] );
- Swap( m[2], m[8] );
- Swap( m[3], m[12] );
- Swap( m[6], m[9] );
- Swap( m[7], m[13] );
- Swap( m[11], m[14] );
-#undef Swap
-}
-
-static void
-drawObjects( GLboolean shadowRender )
-{
- GLboolean textureOn = glIsEnabled( GL_TEXTURE_2D );
-
- if ( shadowRender )
- glDisable( GL_TEXTURE_2D );
-
- if ( !shadowRender ) {
- glNormal3f( 0, 0, 1 );
- glColor3f( 1, 1, 1 );
- glRectf( -20.0, -20.0, 20.0, 20.0 );
- }
-
- glPushMatrix();
- glTranslatef( 11, 11, 11 );
- glRotatef( 54.73, -5, 5, 0 );
- glRotatef( torusAngle, 1, 0, 0 );
- glColor3f( 1, 0, 0 );
- glutSolidTorus( 1, 4, 8, 36 );
- glPopMatrix();
-
- glPushMatrix();
- glTranslatef( 2, 2, 2 );
- glColor3f( 0, 0, 1 );
- glutSolidCube( 4 );
- glPopMatrix();
-
- glPushMatrix();
- glTranslatef( lightPos[0], lightPos[1], lightPos[2] );
- glColor3f( 1, 1, 1 );
- glutWireSphere( 0.5, 6, 6 );
- glPopMatrix();
-
- if ( shadowRender && textureOn )
- glEnable( GL_TEXTURE_2D );
-}
-
-static void
-generateShadowMap( void )
-{
- GLint viewport[4];
- GLfloat lightPos[4];
-
- glGetLightfv( GL_LIGHT0, GL_POSITION, lightPos );
- glGetIntegerv( GL_VIEWPORT, viewport );
-
- glViewport( 0, 0, SHADOW_MAP_WIDTH, SHADOW_MAP_HEIGHT );
-
- glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
-
- glMatrixMode( GL_PROJECTION );
- glPushMatrix();
- glLoadIdentity();
- gluPerspective( 80.0, 1.0, 10.0, 1000.0 );
- glMatrixMode( GL_MODELVIEW );
-
- glPushMatrix();
- glLoadIdentity();
- gluLookAt( lightPos[0], lightPos[1], lightPos[2],
- lookat[0], lookat[1], lookat[2],
- up[0], up[1], up[2] );
-
- drawObjects( GL_TRUE );
-
- glPopMatrix();
- glMatrixMode( GL_PROJECTION );
- glPopMatrix();
- glMatrixMode( GL_MODELVIEW );
-
- glCopyTexImage2D( GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 0, 0,
- SHADOW_MAP_WIDTH, SHADOW_MAP_HEIGHT, 0 );
-
- glViewport( viewport[0], viewport[1], viewport[2], viewport[3] );
-
- if ( showShadow ) {
- GLfloat depthImage[SHADOW_MAP_WIDTH][SHADOW_MAP_HEIGHT];
- glReadPixels( 0, 0, SHADOW_MAP_WIDTH, SHADOW_MAP_HEIGHT,
- GL_DEPTH_COMPONENT, GL_FLOAT, depthImage );
- glWindowPos2f( viewport[2]/2, 0 );
- glDrawPixels( SHADOW_MAP_WIDTH, SHADOW_MAP_HEIGHT, GL_LUMINANCE,
- GL_FLOAT, depthImage );
- glutSwapBuffers();
- }
-}
-
-static void
-generateTextureMatrix( void )
-{
- GLfloat tmpMatrix[16];
-
- /*
- * Set up projective texture matrix. We use the GL_MODELVIEW matrix
- * stack and OpenGL matrix commands to make the matrix.
- */
- glPushMatrix();
- glLoadIdentity();
- glTranslatef( 0.5, 0.5, 0.0 );
- glScalef( 0.5, 0.5, 1.0 );
- gluPerspective( 60.0, 1.0, 1.0, 1000.0 );
- gluLookAt( lightPos[0], lightPos[1], lightPos[2],
- lookat[0], lookat[1], lookat[2],
- up[0], up[1], up[2] );
- glGetFloatv( GL_MODELVIEW_MATRIX, tmpMatrix );
- glPopMatrix();
-
- transposeMatrix( tmpMatrix );
-
- glTexGenfv( GL_S, GL_OBJECT_PLANE, &tmpMatrix[0] );
- glTexGenfv( GL_T, GL_OBJECT_PLANE, &tmpMatrix[4] );
- glTexGenfv( GL_R, GL_OBJECT_PLANE, &tmpMatrix[8] );
- glTexGenfv( GL_Q, GL_OBJECT_PLANE, &tmpMatrix[12] );
-}
-
-static void
-display( void )
-{
- GLfloat radius = 30;
-
- generateShadowMap();
- generateTextureMatrix();
-
- if ( showShadow )
- return;
-
- glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
-
- glPushMatrix();
- gluLookAt( radius*cos(angle), radius*sin(angle), 30,
- lookat[0], lookat[1], lookat[2],
- up[0], up[1], up[2] );
- drawObjects( GL_FALSE );
- glPopMatrix();
-
- glutSwapBuffers();
-}
-
-int
-main( int argc, char** argv )
-{
- glutInit( &argc, argv );
- glutInitDisplayMode( GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE );
- glutInitWindowSize( 512, 512 );
- glutInitWindowPosition( 100, 100 );
- glutCreateWindow( argv[0] );
- glewInit();
-
- init();
-
- glutDisplayFunc( display );
- glutReshapeFunc( reshape );
- glutKeyboardFunc( keyboard );
- glutIdleFunc( idle );
-
- glutMainLoop();
-
- return 0;
-}
projects / mesa.git / blobdiff