Blender V2.61 - r43446

svm_checker.h

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00001 /*
00002  * Copyright 2011, Blender Foundation.
00003  *
00004  * This program is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU General Public License
00006  * as published by the Free Software Foundation; either version 2
00007  * of the License, or (at your option) any later version.
00008  *
00009  * This program is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  * GNU General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU General Public License
00015  * along with this program; if not, write to the Free Software Foundation,
00016  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00017  */
00018 
00019 CCL_NAMESPACE_BEGIN
00020 
00021 /* Checker */
00022 
00023 __device_noinline float svm_checker(float3 p, float scale)
00024 {   
00025     p *= scale;
00026 
00027     /* avoid precision issues on unit coordinates */
00028     p.x = (p.x + 0.00001f)*0.9999f;
00029     p.y = (p.y + 0.00001f)*0.9999f;
00030     p.z = (p.z + 0.00001f)*0.9999f;
00031 
00032     int xi = (int)fabsf(floorf(p.x));
00033     int yi = (int)fabsf(floorf(p.y));
00034     int zi = (int)fabsf(floorf(p.z));
00035 
00036     return ((xi % 2 == yi % 2) == (zi % 2))? 1.0f: 0.0f;
00037 }
00038 
00039 __device void svm_node_tex_checker(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
00040 {   
00041     uint co_offset, color1_offset, color2_offset, scale_offset;
00042     uint color_offset, fac_offset;
00043 
00044     decode_node_uchar4(node.y, &co_offset, &color1_offset, &color2_offset, &scale_offset);
00045     decode_node_uchar4(node.z, &color_offset, &fac_offset, NULL, NULL);
00046 
00047     float3 co = stack_load_float3(stack, co_offset);
00048     float3 color1 = stack_load_float3(stack, color1_offset);
00049     float3 color2 = stack_load_float3(stack, color2_offset);
00050     float scale = stack_load_float_default(stack, scale_offset, node.w);
00051     
00052     float f = svm_checker(co, scale);
00053 
00054     if(stack_valid(color_offset))
00055         stack_store_float3(stack, color_offset, (f == 1.0f)? color1: color2);
00056     if(stack_valid(fac_offset))
00057         stack_store_float(stack, fac_offset, f);
00058 }
00059 
00060 CCL_NAMESPACE_END
00061