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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.
*/
CCL_NAMESPACE_BEGIN
/* Map Range Node */
ccl_device_inline float smootherstep(float edge0, float edge1, float x)
{
x = clamp(safe_divide((x - edge0), (edge1 - edge0)), 0.0f, 1.0f);
return x * x * x * (x * (x * 6.0f - 15.0f) + 10.0f);
}
ccl_device_noinline int svm_node_map_range(KernelGlobals kg,
ccl_private ShaderData *sd,
ccl_private float *stack,
uint value_stack_offset,
uint parameters_stack_offsets,
uint results_stack_offsets,
int offset)
{
uint from_min_stack_offset, from_max_stack_offset, to_min_stack_offset, to_max_stack_offset;
uint type_stack_offset, steps_stack_offset, result_stack_offset;
svm_unpack_node_uchar4(parameters_stack_offsets,
&from_min_stack_offset,
&from_max_stack_offset,
&to_min_stack_offset,
&to_max_stack_offset);
svm_unpack_node_uchar3(
results_stack_offsets, &type_stack_offset, &steps_stack_offset, &result_stack_offset);
uint4 defaults = read_node(kg, &offset);
uint4 defaults2 = read_node(kg, &offset);
float value = stack_load_float(stack, value_stack_offset);
float from_min = stack_load_float_default(stack, from_min_stack_offset, defaults.x);
float from_max = stack_load_float_default(stack, from_max_stack_offset, defaults.y);
float to_min = stack_load_float_default(stack, to_min_stack_offset, defaults.z);
float to_max = stack_load_float_default(stack, to_max_stack_offset, defaults.w);
float steps = stack_load_float_default(stack, steps_stack_offset, defaults2.x);
float result;
if (from_max != from_min) {
float factor = value;
switch (type_stack_offset) {
default:
case NODE_MAP_RANGE_LINEAR:
factor = (value - from_min) / (from_max - from_min);
break;
case NODE_MAP_RANGE_STEPPED: {
factor = (value - from_min) / (from_max - from_min);
factor = (steps > 0.0f) ? floorf(factor * (steps + 1.0f)) / steps : 0.0f;
break;
}
case NODE_MAP_RANGE_SMOOTHSTEP: {
factor = (from_min > from_max) ? 1.0f - smoothstep(from_max, from_min, factor) :
smoothstep(from_min, from_max, factor);
break;
}
case NODE_MAP_RANGE_SMOOTHERSTEP: {
factor = (from_min > from_max) ? 1.0f - smootherstep(from_max, from_min, factor) :
smootherstep(from_min, from_max, factor);
break;
}
}
result = to_min + factor * (to_max - to_min);
}
else {
result = 0.0f;
}
stack_store_float(stack, result_stack_offset, result);
return offset;
}
CCL_NAMESPACE_END
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