00001 /*
00002  * vp_renderR.c
00003  *
00004  * Function to render raw (unclassified) volumes.
00005  *
00006  * Copyright (c) 1994 The Board of Trustees of The Leland Stanford
00007  * Junior University.  All rights reserved.
00008  *
00009  * Permission to use, copy, modify and distribute this software and its
00010  * documentation for any purpose is hereby granted without fee, provided
00011  * that the above copyright notice and this permission notice appear in
00012  * all copies of this software and that you do not sell the software.
00013  * Commercial licensing is available by contacting the author.
00014  * 
00015  * THE SOFTWARE IS PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND,
00016  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
00017  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
00018  *
00019  * Author:
00020  *    Phil Lacroute
00021  *    Computer Systems Laboratory
00022  *    Electrical Engineering Dept.
00023  *    Stanford University
00024  */
00025 
00026 /*
00027  * $Date: 2001/12/17 16:16:23 $
00028  * $Revision: 1.1 $
00029  */
00030 
00031 #include "vp_global.h"
00032 
00033 #define COMP_AR1PB_FUNC         VPCompAR1PB
00034 extern void VPCompAR1PB();
00035 
00036 #define COMP_AR3PB_FUNC         VPCompAR3PB
00037 extern void VPCompAR3PB();
00038 
00039 #ifdef COMP_AR11B
00040 #define COMP_AR11B_FUNC         VPCompAR11B
00041 extern void VPCompAR11B();
00042 #else
00043 #define COMP_AR11B_FUNC         VPCompAR1NB
00044 #endif
00045 
00046 #ifdef COMP_AR31B
00047 #define COMP_AR31B_FUNC         VPCompAR31B
00048 extern void VPCompAR31B();
00049 #else
00050 #define COMP_AR31B_FUNC         VPCompAR3NB
00051 #endif
00052 
00053 #ifdef COMP_AR12B
00054 #define COMP_AR12B_FUNC         VPCompAR12B
00055 extern void VPCompAR12B();
00056 #else
00057 #define COMP_AR12B_FUNC         VPCompAR1NB
00058 #endif
00059 
00060 #ifdef COMP_AR32B
00061 #define COMP_AR32B_FUNC         VPCompAR32B
00062 extern void VPCompAR32B();
00063 #else
00064 #define COMP_AR32B_FUNC         VPCompAR3NB
00065 #endif
00066 
00067 #define COMP_AR1NB_FUNC         VPCompAR1NB
00068 extern void VPCompAR1NB();
00069 
00070 #define COMP_AR3NB_FUNC         VPCompAR3NB
00071 extern void VPCompAR3NB();
00072 
00073 
00074 #define COMP_AR1PS_FUNC         VPCompAR1PB
00075 
00076 #define COMP_AR3PS_FUNC         VPCompAR3PB
00077 
00078 #ifdef COMP_AR11S
00079 #define COMP_AR11S_FUNC         VPCompAR11S
00080 extern void VPCompAR11S();
00081 #else
00082 #define COMP_AR11S_FUNC         VPCompAR1NS
00083 #endif
00084 
00085 #ifdef COMP_AR31S
00086 #define COMP_AR31S_FUNC         VPCompAR31S
00087 extern void VPCompAR31S();
00088 #else
00089 #define COMP_AR31S_FUNC         VPCompAR3NS
00090 #endif
00091 
00092 #ifdef COMP_AR12S
00093 #define COMP_AR12S_FUNC         VPCompAR12S
00094 extern void VPCompAR12S();
00095 #else
00096 #define COMP_AR12S_FUNC         VPCompAR1NS
00097 #endif
00098 
00099 #ifdef COMP_AR32S
00100 #define COMP_AR32S_FUNC         VPCompAR32S
00101 extern void VPCompAR32S();
00102 #else
00103 #define COMP_AR32S_FUNC         VPCompAR3NS
00104 #endif
00105 
00106 #define COMP_AR1NS_FUNC         VPCompAR1NS
00107 extern void VPCompAR1NS();
00108 
00109 #define COMP_AR3NS_FUNC         VPCompAR3NS
00110 extern void VPCompAR3NS();
00111 
00112 #ifdef INDEX_VOLUME
00113 extern void VPCompAI11B();
00114 #endif
00115 
00116 #define SHADOWS_OFF             0
00117 #define SHADOWS_ON              1
00118 #define SHADOW_OPTS             2
00119 
00120 #define MATERIAL_CALLBACK       0
00121 #define MATERIAL_ONE            1
00122 #define MATERIAL_TWO            2
00123 #define MATERIAL_MORE           3
00124 #define MATERIAL_OPTS           4
00125 
00126 #define COLOR_GRAY              0
00127 #define COLOR_RGB               1
00128 #define COLOR_OPTS              2
00129 
00130 static void (*AffineProcTable[SHADOW_OPTS][MATERIAL_OPTS][COLOR_OPTS])() = {
00131     {
00132         { COMP_AR1PB_FUNC, COMP_AR3PB_FUNC },
00133         { COMP_AR11B_FUNC, COMP_AR31B_FUNC },
00134         { COMP_AR12B_FUNC, COMP_AR32B_FUNC },
00135         { COMP_AR1NB_FUNC, COMP_AR3NB_FUNC }
00136     },
00137     {
00138         { COMP_AR1PS_FUNC, COMP_AR3PS_FUNC },
00139         { COMP_AR11S_FUNC, COMP_AR31S_FUNC },
00140         { COMP_AR12S_FUNC, COMP_AR32S_FUNC },
00141         { COMP_AR1NS_FUNC, COMP_AR3NS_FUNC }
00142     }
00143 };
00144 
00145 /*
00146  * vpRenderRawVolume
00147  *
00148  * Render an uclassified volume using the shear-warp algorithm.
00149  */
00150 
00151 vpResult
00152 vpRenderRawVolume(vpc)
00153 vpContext *vpc;
00154 {
00155     int retcode;
00156     void (*composite_func)();
00157     int shadow_option, material_option, color_option;
00158 
00159     /* check for errors and initialize */
00160     if ((retcode = VPCheckRawVolume(vpc)) != VP_OK)
00161         return(retcode);
00162     if ((retcode = VPCheckClassifier(vpc)) != VP_OK)
00163         return(retcode);
00164     if ((retcode = VPCheckShader(vpc)) != VP_OK)
00165         return(retcode);
00166     if ((retcode = VPCheckImage(vpc)) != VP_OK)
00167         return(retcode);
00168     if (vpc->num_clsfy_params > 2)
00169         return(VPSetError(vpc, VPERROR_LIMIT_EXCEEDED));
00170     if ((retcode = VPFactorView(vpc)) != VP_OK)
00171         return(retcode);
00172 
00173     Debug((vpc, VPDEBUG_RENDER, "Algorithm: affine RAWvolume (%s)\n",
00174            vpc->mm_octree == NULL ? "no octree" : "with octree"));
00175 
00176     /* determine which options are enabled */
00177     if (vpc->enable_shadows)
00178         shadow_option = SHADOWS_ON;
00179     else
00180         shadow_option = SHADOWS_OFF;
00181     if (vpc->shading_mode == CALLBACK_SHADER)
00182         material_option = MATERIAL_CALLBACK;
00183     else if (vpc->num_materials == 1)
00184         material_option = MATERIAL_ONE;
00185     else if (vpc->num_materials == 2)
00186         material_option = MATERIAL_TWO;
00187     else
00188         material_option = MATERIAL_MORE;
00189     if (vpc->color_channels == 1)
00190         color_option = COLOR_GRAY;
00191     else
00192         color_option = COLOR_RGB;
00193 
00194     /* render */
00195     if (vpc->affine_view) {
00196         /* choose a compositing function */
00197         composite_func = AffineProcTable[shadow_option][material_option]
00198                                         [color_option];
00199         VPRenderAffine(vpc, USE_RAWVOLUME, composite_func);
00200     } else {
00201         /* XXX perspective rendering not available yet */
00202         return(VPSetError(vpc, VPERROR_BAD_OPTION));
00203     }
00204 
00205     return(VP_OK);
00206 }