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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.
*/
#ifndef __SVM_RAMP_H__
#define __SVM_RAMP_H__
CCL_NAMESPACE_BEGIN
__device float4 rgb_ramp_lookup(KernelGlobals *kg, int offset, float f)
{
f = clamp(f, 0.0f, 1.0f)*(RAMP_TABLE_SIZE-1);
int i = (int)f;
float t = f - (float)i;
float4 a = fetch_node_float(kg, offset+i);
if(t > 0.0f)
a = (1.0f - t)*a + t*fetch_node_float(kg, offset+i+1);
return a;
}
__device void svm_node_rgb_ramp(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
{
uint fac_offset = node.y;
uint color_offset = node.z;
uint alpha_offset = node.w;
float fac = stack_load_float(stack, fac_offset);
float4 color = rgb_ramp_lookup(kg, *offset, fac);
if(stack_valid(color_offset))
stack_store_float3(stack, color_offset, float4_to_float3(color));
if(stack_valid(alpha_offset))
stack_store_float(stack, alpha_offset, color.w);
*offset += RAMP_TABLE_SIZE;
}
__device void svm_node_rgb_curves(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
{
uint fac_offset = node.y;
uint color_offset = node.z;
uint out_offset = node.w;
float fac = stack_load_float(stack, fac_offset);
float3 color = stack_load_float3(stack, color_offset);
float r = rgb_ramp_lookup(kg, *offset, rgb_ramp_lookup(kg, *offset, color.x).w).x;
float g = rgb_ramp_lookup(kg, *offset, rgb_ramp_lookup(kg, *offset, color.y).w).y;
float b = rgb_ramp_lookup(kg, *offset, rgb_ramp_lookup(kg, *offset, color.z).w).z;
color = (1.0f - fac)*color + fac*make_float3(r, g, b);
stack_store_float3(stack, out_offset, color);
*offset += RAMP_TABLE_SIZE;
}
CCL_NAMESPACE_END
#endif /* __SVM_RAMP_H__ */
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