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
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/*
|
|
* 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
|
|
|
|
/* Gradient */
|
|
|
|
ccl_device float svm_gradient(float3 p, NodeGradientType type)
|
|
{
|
|
float x, y, z;
|
|
|
|
x = p.x;
|
|
y = p.y;
|
|
z = p.z;
|
|
|
|
if(type == NODE_BLEND_LINEAR) {
|
|
return x;
|
|
}
|
|
else if(type == NODE_BLEND_QUADRATIC) {
|
|
float r = fmaxf(x, 0.0f);
|
|
return r*r;
|
|
}
|
|
else if(type == NODE_BLEND_EASING) {
|
|
float r = fminf(fmaxf(x, 0.0f), 1.0f);
|
|
float t = r*r;
|
|
|
|
return (3.0f*t - 2.0f*t*r);
|
|
}
|
|
else if(type == NODE_BLEND_DIAGONAL) {
|
|
return (x + y) * 0.5f;
|
|
}
|
|
else if(type == NODE_BLEND_RADIAL) {
|
|
return atan2f(y, x) / M_2PI_F + 0.5f;
|
|
}
|
|
else {
|
|
float r = fmaxf(1.0f - sqrtf(x*x + y*y + z*z), 0.0f);
|
|
|
|
if(type == NODE_BLEND_QUADRATIC_SPHERE)
|
|
return r*r;
|
|
else if(type == NODE_BLEND_SPHERICAL)
|
|
return r;
|
|
}
|
|
|
|
return 0.0f;
|
|
}
|
|
|
|
ccl_device void svm_node_tex_gradient(ShaderData *sd, float *stack, uint4 node)
|
|
{
|
|
uint type, co_offset, color_offset, fac_offset;
|
|
|
|
decode_node_uchar4(node.y, &type, &co_offset, &fac_offset, &color_offset);
|
|
|
|
float3 co = stack_load_float3(stack, co_offset);
|
|
|
|
float f = svm_gradient(co, (NodeGradientType)type);
|
|
f = saturate(f);
|
|
|
|
if(stack_valid(fac_offset))
|
|
stack_store_float(stack, fac_offset, f);
|
|
if(stack_valid(color_offset))
|
|
stack_store_float3(stack, color_offset, make_float3(f, f, f));
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|
|
|