958d0d4236
Modes: Linear interpolation (default), stepped linear, smoothstep and smootherstep. This also includes an additional option for the **Clamp node** to switch between **Min Max** (default) and **Range** mode. This was needed to allow clamping when **To Max** is less than **To Min**. Reviewed By: JacquesLucke, brecht Differential Revision: https://developer.blender.org/D5827
89 lines
3.3 KiB
C
89 lines
3.3 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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CCL_NAMESPACE_BEGIN
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/* Map Range Node */
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ccl_device_inline float smootherstep(float edge0, float edge1, float x)
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{
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x = clamp(safe_divide((x - edge0), (edge1 - edge0)), 0.0f, 1.0f);
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return x * x * x * (x * (x * 6.0f - 15.0f) + 10.0f);
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}
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ccl_device void svm_node_map_range(KernelGlobals *kg,
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ShaderData *sd,
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float *stack,
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uint value_stack_offset,
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uint parameters_stack_offsets,
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uint results_stack_offsets,
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int *offset)
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{
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uint from_min_stack_offset, from_max_stack_offset, to_min_stack_offset, to_max_stack_offset;
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uint type_stack_offset, steps_stack_offset, result_stack_offset;
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svm_unpack_node_uchar4(parameters_stack_offsets,
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&from_min_stack_offset,
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&from_max_stack_offset,
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&to_min_stack_offset,
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&to_max_stack_offset);
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svm_unpack_node_uchar3(
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results_stack_offsets, &type_stack_offset, &steps_stack_offset, &result_stack_offset);
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uint4 defaults = read_node(kg, offset);
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uint4 defaults2 = read_node(kg, offset);
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float value = stack_load_float(stack, value_stack_offset);
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float from_min = stack_load_float_default(stack, from_min_stack_offset, defaults.x);
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float from_max = stack_load_float_default(stack, from_max_stack_offset, defaults.y);
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float to_min = stack_load_float_default(stack, to_min_stack_offset, defaults.z);
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float to_max = stack_load_float_default(stack, to_max_stack_offset, defaults.w);
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float steps = stack_load_float_default(stack, steps_stack_offset, defaults2.x);
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float result;
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if (from_max != from_min) {
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float factor = value;
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switch (type_stack_offset) {
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default:
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case NODE_MAP_RANGE_LINEAR:
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factor = (value - from_min) / (from_max - from_min);
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break;
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case NODE_MAP_RANGE_STEPPED: {
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factor = (value - from_min) / (from_max - from_min);
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factor = (steps > 0.0f) ? floorf(factor * (steps + 1.0f)) / steps : 0.0f;
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break;
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}
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case NODE_MAP_RANGE_SMOOTHSTEP: {
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factor = (from_min > from_max) ? 1.0f - smoothstep(from_max, from_min, factor) :
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smoothstep(from_min, from_max, factor);
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break;
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}
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case NODE_MAP_RANGE_SMOOTHERSTEP: {
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factor = (from_min > from_max) ? 1.0f - smootherstep(from_max, from_min, factor) :
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smootherstep(from_min, from_max, factor);
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break;
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}
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}
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result = to_min + factor * (to_max - to_min);
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}
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else {
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result = 0.0f;
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}
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stack_store_float(stack, result_stack_offset, result);
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}
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CCL_NAMESPACE_END
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