forked from bartvdbraak/blender
ae7d84dbc1
This more a workaround for CUDA optimizer which can't optimize clamp(x, 0, 1) into a single instruction and uses 4 instructions instead. Original patch by @lockal with own modification: Don't make changes outside of the kernel. They don't make any difference anyway and term saturate() has a bit different meaning outside of kernel. This gives around 2% of speedup in Barcelona file, but in more complex shader setups with lots of math nodes with clamping speedup could be much nicer. Subscribers: dingto Projects: #cycles Differential Revision: https://developer.blender.org/D1224
98 lines
3.0 KiB
C
98 lines
3.0 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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ccl_device float4 rgb_ramp_lookup(KernelGlobals *kg, int offset, float f, bool interpolate)
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{
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f = saturate(f)*(RAMP_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, RAMP_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(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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decode_node_uchar4(node.y, &fac_offset, &color_offset, &alpha_offset, NULL);
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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);
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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 += RAMP_TABLE_SIZE;
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}
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ccl_device void svm_node_rgb_curves(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
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{
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uint fac_offset = node.y;
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uint color_offset = node.z;
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uint out_offset = node.w;
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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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float r = rgb_ramp_lookup(kg, *offset, color.x, true).x;
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float g = rgb_ramp_lookup(kg, *offset, color.y, true).y;
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float b = rgb_ramp_lookup(kg, *offset, color.z, true).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 += RAMP_TABLE_SIZE;
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}
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ccl_device void svm_node_vector_curves(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
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{
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uint fac_offset = node.y;
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uint color_offset = node.z;
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uint out_offset = node.w;
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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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float r = rgb_ramp_lookup(kg, *offset, (color.x + 1.0f)*0.5f, true).x;
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float g = rgb_ramp_lookup(kg, *offset, (color.y + 1.0f)*0.5f, true).y;
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float b = rgb_ramp_lookup(kg, *offset, (color.z + 1.0f)*0.5f, true).z;
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color = (1.0f - fac)*color + fac*make_float3(r*2.0f - 1.0f, g*2.0f - 1.0f, b*2.0f - 1.0f);
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stack_store_float3(stack, out_offset, color);
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*offset += RAMP_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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