forked from bartvdbraak/blender
2b999c6a68
These functions no longer accept NULL. They were renamed for clarity and to avoid hidden merge issues. Ref D5363
105 lines
3.2 KiB
C
105 lines
3.2 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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#ifndef __SVM_RAMP_H__
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#define __SVM_RAMP_H__
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CCL_NAMESPACE_BEGIN
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/* NOTE: svm_ramp.h, svm_ramp_util.h and node_ramp_util.h must stay consistent */
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ccl_device_inline float4 rgb_ramp_lookup(
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KernelGlobals *kg, int offset, float f, bool interpolate, bool extrapolate, int table_size)
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{
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if ((f < 0.0f || f > 1.0f) && extrapolate) {
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float4 t0, dy;
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if (f < 0.0f) {
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t0 = fetch_node_float(kg, offset);
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dy = t0 - fetch_node_float(kg, offset + 1);
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f = -f;
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}
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else {
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t0 = fetch_node_float(kg, offset + table_size - 1);
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dy = t0 - fetch_node_float(kg, offset + table_size - 2);
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f = f - 1.0f;
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}
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return t0 + dy * f * (table_size - 1);
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}
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f = saturate(f) * (table_size - 1);
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/* clamp int as well in case of NaN */
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int i = clamp(float_to_int(f), 0, table_size - 1);
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float t = f - (float)i;
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float4 a = fetch_node_float(kg, offset + i);
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if (interpolate && t > 0.0f)
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a = (1.0f - t) * a + t * fetch_node_float(kg, offset + i + 1);
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return a;
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}
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ccl_device void svm_node_rgb_ramp(
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KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
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{
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uint fac_offset, color_offset, alpha_offset;
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uint interpolate = node.z;
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svm_unpack_node_uchar3(node.y, &fac_offset, &color_offset, &alpha_offset);
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uint table_size = read_node(kg, offset).x;
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float fac = stack_load_float(stack, fac_offset);
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float4 color = rgb_ramp_lookup(kg, *offset, fac, interpolate, false, table_size);
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if (stack_valid(color_offset))
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stack_store_float3(stack, color_offset, float4_to_float3(color));
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if (stack_valid(alpha_offset))
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stack_store_float(stack, alpha_offset, color.w);
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*offset += table_size;
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}
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ccl_device void svm_node_curves(
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KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
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{
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uint fac_offset, color_offset, out_offset;
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svm_unpack_node_uchar3(node.y, &fac_offset, &color_offset, &out_offset);
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uint table_size = read_node(kg, offset).x;
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float fac = stack_load_float(stack, fac_offset);
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float3 color = stack_load_float3(stack, color_offset);
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const float min_x = __int_as_float(node.z), max_x = __int_as_float(node.w);
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const float range_x = max_x - min_x;
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const float3 relpos = (color - make_float3(min_x, min_x, min_x)) / range_x;
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float r = rgb_ramp_lookup(kg, *offset, relpos.x, true, true, table_size).x;
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float g = rgb_ramp_lookup(kg, *offset, relpos.y, true, true, table_size).y;
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float b = rgb_ramp_lookup(kg, *offset, relpos.z, true, true, table_size).z;
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color = (1.0f - fac) * color + fac * make_float3(r, g, b);
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stack_store_float3(stack, out_offset, color);
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*offset += table_size;
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}
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CCL_NAMESPACE_END
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#endif /* __SVM_RAMP_H__ */
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