source/blender/nodes/shader/node_shader_tree.c

   1 /*
   2  * ***** BEGIN GPL LICENSE BLOCK *****
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  *
  18  * The Original Code is Copyright (C) 2007 Blender Foundation.
  19  * All rights reserved.
  20  *
  21  * The Original Code is: all of this file.
  22  *
  23  * Contributor(s):
  24  *
  25  * ***** END GPL LICENSE BLOCK *****
  26  */
  27
  28 /** \file blender/nodes/shader/node_shader_tree.c
  29  *  \ingroup nodes
  30  */
  31
  32
  33 #include <string.h>
  34
  35 #include "DNA_material_types.h"
  36 #include "DNA_node_types.h"
  37
  38 #include "BLI_listbase.h"
  39 #include "BLI_math.h"
  40 #include "BLI_threads.h"
  41 #include "BLI_utildefines.h"
  42
  43 #include "BKE_global.h"
  44 #include "BKE_main.h"
  45 #include "BKE_node.h"
  46 #include "BKE_utildefines.h"
  47
  48 #include "GPU_material.h"
  49
  50 #include "RE_shader_ext.h"
  51
  52 #include "node_exec.h"
  53 #include "node_util.h"
  54 #include "node_shader_util.h"
  55
  56 static void foreach_nodetree(Main *main, void *calldata, bNodeTreeCallback func)
  57 {
  58         Material *ma;
  59         for(ma= main->mat.first; ma; ma= ma->id.next) {
  60                 if(ma->nodetree) {
  61                         func(calldata, &ma->id, ma->nodetree);
  62                 }
  63         }
  64 }
  65
  66 static void local_sync(bNodeTree *localtree, bNodeTree *ntree)
  67 {
  68         bNode *lnode;
  69
  70         /* copy over contents of previews */
  71         for(lnode= localtree->nodes.first; lnode; lnode= lnode->next) {
  72                 if(ntreeNodeExists(ntree, lnode->new_node)) {
  73                         bNode *node= lnode->new_node;
  74
  75                         if(node->preview && node->preview->rect) {
  76                                 if(lnode->preview && lnode->preview->rect) {
  77                                         int xsize= node->preview->xsize;
  78                                         int ysize= node->preview->ysize;
  79                                         memcpy(node->preview->rect, lnode->preview->rect, 4*xsize + xsize*ysize*sizeof(char)*4);
  80                                 }
  81                         }
  82                 }
  83         }
  84 }
  85
  86 static void update(bNodeTree *ntree)
  87 {
  88         ntreeSetOutput(ntree);
  89 }
  90
  91 bNodeTreeType ntreeType_Shader = {
  92         /* type */                              NTREE_SHADER,
  93         /* id_name */                   "NTShader Nodetree",
  94
  95         /* node_types */                { NULL, NULL },
  96
  97         /* free_cache */                NULL,
  98         /* free_node_cache */   NULL,
  99         /* foreach_nodetree */  foreach_nodetree,
 100         /* localize */                  NULL,
 101         /* local_sync */                local_sync,
 102         /* local_merge */               NULL,
 103         /* update */                    update,
 104         /* update_node */               NULL
 105 };
 106
 107 /* GPU material from shader nodes */
 108
 109 void ntreeGPUMaterialNodes(bNodeTree *ntree, GPUMaterial *mat)
 110 {
 111         bNodeTreeExec *exec;
 112
 113         exec = ntreeShaderBeginExecTree(ntree, 1);
 114
 115         ntreeExecGPUNodes(exec, mat, 1);
 116
 117         ntreeShaderEndExecTree(exec, 1);
 118 }
 119
 120 /* **************** call to switch lamploop for material node ************ */
 121
 122 void (*node_shader_lamp_loop)(struct ShadeInput *, struct ShadeResult *);
 123
 124 void set_node_shader_lamp_loop(void (*lamp_loop_func)(ShadeInput *, ShadeResult *))
 125 {
 126         node_shader_lamp_loop= lamp_loop_func;
 127 }
 128
 129
 130 /* XXX Group nodes must set use_tree_data to false, since their trees can be shared by multiple nodes.
 131  * If use_tree_data is true, the ntree->execdata pointer is checked to avoid multiple execution of top-level trees.
 132  */
 133 bNodeTreeExec *ntreeShaderBeginExecTree(bNodeTree *ntree, int use_tree_data)
 134 {
 135         bNodeTreeExec *exec;
 136         bNode *node;
 137
 138         if (use_tree_data) {
 139                 /* XXX hack: prevent exec data from being generated twice.
 140                  * this should be handled by the renderer!
 141                  */
 142                 if (ntree->execdata)
 143                         return ntree->execdata;
 144         }
 145
 146         /* ensures only a single output node is enabled */
 147         ntreeSetOutput(ntree);
 148
 149         /* common base initialization */
 150         exec = ntree_exec_begin(ntree);
 151
 152         /* allocate the thread stack listbase array */
 153         exec->threadstack= MEM_callocN(BLENDER_MAX_THREADS*sizeof(ListBase), "thread stack array");
 154
 155         for(node= exec->nodetree->nodes.first; node; node= node->next)
 156                 node->need_exec= 1;
 157
 158         if (use_tree_data) {
 159                 /* XXX this should not be necessary, but is still used for cmp/sha/tex nodes,
 160                  * which only store the ntree pointer. Should be fixed at some point!
 161                  */
 162                 ntree->execdata = exec;
 163         }
 164
 165         return exec;
 166 }
 167
 168 /* XXX Group nodes must set use_tree_data to false, since their trees can be shared by multiple nodes.
 169  * If use_tree_data is true, the ntree->execdata pointer is checked to avoid multiple execution of top-level trees.
 170  */
 171 void ntreeShaderEndExecTree(bNodeTreeExec *exec, int use_tree_data)
 172 {
 173         if(exec) {
 174                 bNodeTree *ntree= exec->nodetree;
 175                 bNodeThreadStack *nts;
 176                 int a;
 177
 178                 if(exec->threadstack) {
 179                         for(a=0; a<BLENDER_MAX_THREADS; a++) {
 180                                 for(nts=exec->threadstack[a].first; nts; nts=nts->next)
 181                                         if (nts->stack) MEM_freeN(nts->stack);
 182                                 BLI_freelistN(&exec->threadstack[a]);
 183                         }
 184
 185                         MEM_freeN(exec->threadstack);
 186                         exec->threadstack= NULL;
 187                 }
 188
 189                 ntree_exec_end(exec);
 190
 191                 if (use_tree_data) {
 192                         /* XXX clear nodetree backpointer to exec data, same problem as noted in ntreeBeginExecTree */
 193                         ntree->execdata = NULL;
 194                 }
 195         }
 196 }
 197
 198 void ntreeShaderExecTree(bNodeTree *ntree, ShadeInput *shi, ShadeResult *shr)
 199 {
 200         ShaderCallData scd;
 201         /*
 202         @note: preserve material from ShadeInput for material id, nodetree execs change it
 203         fix for bug "[#28012] Mat ID messy with shader nodes"
 204         */
 205         Material *mat = shi->mat;       bNodeThreadStack *nts = NULL;
 206         bNodeTreeExec *exec = ntree->execdata;
 207
 208         /* convert caller data to struct */
 209         scd.shi= shi;
 210         scd.shr= shr;
 211
 212         /* each material node has own local shaderesult, with optional copying */
 213         memset(shr, 0, sizeof(ShadeResult));
 214
 215         if (!exec)
 216                 exec = ntree->execdata = ntreeShaderBeginExecTree(ntree, 1);
 217
 218         nts= ntreeGetThreadStack(exec, shi->thread);
 219         ntreeExecThreadNodes(exec, nts, &scd, shi->thread);
 220         ntreeReleaseThreadStack(nts);
 221
 222         // @note: set material back to preserved material
 223         shi->mat = mat;
 224         /* better not allow negative for now */
 225         if(shr->combined[0]<0.0f) shr->combined[0]= 0.0f;
 226         if(shr->combined[1]<0.0f) shr->combined[1]= 0.0f;
 227         if(shr->combined[2]<0.0f) shr->combined[2]= 0.0f;
 228 }