svm_checker.h

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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 = (int)fabsf(floorf(p.x));
    int yi = (int)fabsf(floorf(p.y));
    int zi = (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, int *offset)
{   
    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