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/** |
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(c) Copyright 1993, Silicon Graphics, Inc. |
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ALL RIGHTS RESERVED |
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Permission to use, copy, modify, and distribute this software |
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for any purpose and without fee is hereby granted, provided |
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that the above copyright notice appear in all copies and that |
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both the copyright notice and this permission notice appear in |
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supporting documentation, and that the name of Silicon |
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Graphics, Inc. not be used in advertising or publicity |
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pertaining to distribution of the software without specific, |
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written prior permission. |
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THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU |
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"AS-IS" AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR |
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OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF |
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO |
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EVENT SHALL SILICON GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE |
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ELSE FOR ANY DIRECT, SPECIAL, INCIDENTAL, INDIRECT OR |
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CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER, |
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INCLUDING WITHOUT LIMITATION, LOSS OF PROFIT, LOSS OF USE, |
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SAVINGS OR REVENUE, OR THE CLAIMS OF THIRD PARTIES, WHETHER OR |
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NOT SILICON GRAPHICS, INC. HAS BEEN ADVISED OF THE POSSIBILITY |
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OF SUCH LOSS, HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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ARISING OUT OF OR IN CONNECTION WITH THE POSSESSION, USE OR |
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PERFORMANCE OF THIS SOFTWARE. |
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US Government Users Restricted Rights |
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Use, duplication, or disclosure by the Government is subject to |
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restrictions set forth in FAR 52.227.19(c)(2) or subparagraph |
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(c)(1)(ii) of the Rights in Technical Data and Computer |
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Software clause at DFARS 252.227-7013 and/or in similar or |
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successor clauses in the FAR or the DOD or NASA FAR |
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Supplement. Unpublished-- rights reserved under the copyright |
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laws of the United States. Contractor/manufacturer is Silicon |
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Graphics, Inc., 2011 N. Shoreline Blvd., Mountain View, CA |
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94039-7311. |
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OpenGL(TM) is a trademark of Silicon Graphics, Inc. |
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*/ |
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/* Taken from the projshadow.c - by Tom McReynolds, SGI */ |
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/* Modified by David Bucciarelli */ |
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/* Rendering shadows using projective shadows. */ |
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#include <GL/glut.h> |
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#include "shadow.h" |
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enum { |
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X, Y, Z, W |
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}; |
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enum { |
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A, B, C, D |
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}; |
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/* create a matrix that will project the desired shadow */ |
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void |
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shadowmatrix(GLfloat shadowMat[4][4], |
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GLfloat groundplane[4], |
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GLfloat lightpos[4]) |
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{ |
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GLfloat dot; |
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/* find dot product between light position vector and ground plane normal */ |
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dot = groundplane[X] * lightpos[X] + |
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groundplane[Y] * lightpos[Y] + |
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groundplane[Z] * lightpos[Z] + |
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groundplane[W] * lightpos[W]; |
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shadowMat[0][0] = dot - lightpos[X] * groundplane[X]; |
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shadowMat[1][0] = 0.f - lightpos[X] * groundplane[Y]; |
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shadowMat[2][0] = 0.f - lightpos[X] * groundplane[Z]; |
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shadowMat[3][0] = 0.f - lightpos[X] * groundplane[W]; |
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shadowMat[X][1] = 0.f - lightpos[Y] * groundplane[X]; |
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shadowMat[1][1] = dot - lightpos[Y] * groundplane[Y]; |
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shadowMat[2][1] = 0.f - lightpos[Y] * groundplane[Z]; |
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shadowMat[3][1] = 0.f - lightpos[Y] * groundplane[W]; |
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shadowMat[X][2] = 0.f - lightpos[Z] * groundplane[X]; |
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shadowMat[1][2] = 0.f - lightpos[Z] * groundplane[Y]; |
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shadowMat[2][2] = dot - lightpos[Z] * groundplane[Z]; |
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shadowMat[3][2] = 0.f - lightpos[Z] * groundplane[W]; |
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shadowMat[X][3] = 0.f - lightpos[W] * groundplane[X]; |
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shadowMat[1][3] = 0.f - lightpos[W] * groundplane[Y]; |
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shadowMat[2][3] = 0.f - lightpos[W] * groundplane[Z]; |
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shadowMat[3][3] = dot - lightpos[W] * groundplane[W]; |
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} |
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/* find the plane equation given 3 points */ |
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void |
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findplane(GLfloat plane[4], |
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GLfloat v0[3], GLfloat v1[3], GLfloat v2[3]) |
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{ |
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GLfloat vec0[3], vec1[3]; |
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/* need 2 vectors to find cross product */ |
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vec0[X] = v1[X] - v0[X]; |
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vec0[Y] = v1[Y] - v0[Y]; |
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vec0[Z] = v1[Z] - v0[Z]; |
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vec1[X] = v2[X] - v0[X]; |
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vec1[Y] = v2[Y] - v0[Y]; |
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vec1[Z] = v2[Z] - v0[Z]; |
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/* find cross product to get A, B, and C of plane equation */ |
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plane[A] = vec0[Y] * vec1[Z] - vec0[Z] * vec1[Y]; |
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plane[B] = -(vec0[X] * vec1[Z] - vec0[Z] * vec1[X]); |
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plane[C] = vec0[X] * vec1[Y] - vec0[Y] * vec1[X]; |
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plane[D] = -(plane[A] * v0[X] + plane[B] * v0[Y] + plane[C] * v0[Z]); |
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} |
Brian Paul
24 anos atrás