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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __SVM_RAMP_H__
#define __SVM_RAMP_H__
CCL_NAMESPACE_BEGIN
/* NOTE: svm_ramp.h, svm_ramp_util.h and node_ramp_util.h must stay consistent */
ccl_device_inline float4 rgb_ramp_lookup(KernelGlobals *kg,
int offset,
float f,
bool interpolate,
bool extrapolate,
int table_size)
{
if((f < 0.0f || f > 1.0f) && extrapolate) {
float4 t0, dy;
if(f < 0.0f) {
t0 = fetch_node_float(kg, offset);
dy = t0 - fetch_node_float(kg, offset + 1);
f = -f;
}
else {
t0 = fetch_node_float(kg, offset + table_size - 1);
dy = t0 - fetch_node_float(kg, offset + table_size - 2);
f = f - 1.0f;
}
return t0 + dy * f * (table_size-1);
}
f = saturate(f)*(table_size-1);
/* clamp int as well in case of NaN */
int i = clamp(float_to_int(f), 0, table_size-1);
float t = f - (float)i;
float4 a = fetch_node_float(kg, offset+i);
if(interpolate && t > 0.0f)
a = (1.0f - t)*a + t*fetch_node_float(kg, offset+i+1);
return a;
}
ccl_device void svm_node_rgb_ramp(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
{
uint fac_offset, color_offset, alpha_offset;
uint interpolate = node.z;
decode_node_uchar4(node.y, &fac_offset, &color_offset, &alpha_offset, NULL);
uint table_size = read_node(kg, offset).x;
float fac = stack_load_float(stack, fac_offset);
float4 color = rgb_ramp_lookup(kg, *offset, fac, interpolate, false, table_size);
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 += table_size;
}
ccl_device void svm_node_curves(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
{
uint fac_offset, color_offset, out_offset;
decode_node_uchar4(node.y,
&fac_offset,
&color_offset,
&out_offset,
NULL);
uint table_size = read_node(kg, offset).x;
float fac = stack_load_float(stack, fac_offset);
float3 color = stack_load_float3(stack, color_offset);
const float min_x = __int_as_float(node.z),
max_x = __int_as_float(node.w);
const float range_x = max_x - min_x;
const float3 relpos = (color - make_float3(min_x, min_x, min_x)) / range_x;
float r = rgb_ramp_lookup(kg, *offset, relpos.x, true, true, table_size).x;
float g = rgb_ramp_lookup(kg, *offset, relpos.y, true, true, table_size).y;
float b = rgb_ramp_lookup(kg, *offset, relpos.z, true, true, table_size).z;
color = (1.0f - fac)*color + fac*make_float3(r, g, b);
stack_store_float3(stack, out_offset, color);
*offset += table_size;
}
CCL_NAMESPACE_END
#endif /* __SVM_RAMP_H__ */
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