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/*
* Copyright 2011, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
CCL_NAMESPACE_BEGIN
/* Checker */
__device_noinline float svm_checker(float3 p, float scale)
{
p *= scale;
/* avoid precision issues on unit coordinates */
p.x = (p.x + 0.00001f)*0.9999f;
p.y = (p.y + 0.00001f)*0.9999f;
p.z = (p.z + 0.00001f)*0.9999f;
int xi = float_to_int(fabsf(floorf(p.x)));
int yi = float_to_int(fabsf(floorf(p.y)));
int zi = float_to_int(fabsf(floorf(p.z)));
return ((xi % 2 == yi % 2) == (zi % 2))? 1.0f: 0.0f;
}
__device void svm_node_tex_checker(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
{
uint co_offset, color1_offset, color2_offset, scale_offset;
uint color_offset, fac_offset;
decode_node_uchar4(node.y, &co_offset, &color1_offset, &color2_offset, &scale_offset);
decode_node_uchar4(node.z, &color_offset, &fac_offset, NULL, NULL);
float3 co = stack_load_float3(stack, co_offset);
float3 color1 = stack_load_float3(stack, color1_offset);
float3 color2 = stack_load_float3(stack, color2_offset);
float scale = stack_load_float_default(stack, scale_offset, node.w);
float f = svm_checker(co, scale);
if(stack_valid(color_offset))
stack_store_float3(stack, color_offset, (f == 1.0f)? color1: color2);
if(stack_valid(fac_offset))
stack_store_float(stack, fac_offset, f);
}
CCL_NAMESPACE_END
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