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/*
* Copyright 2011-2014 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
ccl_device float average_fac(float3 v)
{
return (fabsf(v.x) + fabsf(v.y) + fabsf(v.z))/3.0f;
}
ccl_device void svm_vector_math(float *Fac, float3 *Vector, NodeVectorMath type, float3 Vector1, float3 Vector2)
{
if(type == NODE_VECTOR_MATH_ADD) {
*Vector = Vector1 + Vector2;
*Fac = average_fac(*Vector);
}
else if(type == NODE_VECTOR_MATH_SUBTRACT) {
*Vector = Vector1 - Vector2;
*Fac = average_fac(*Vector);
}
else if(type == NODE_VECTOR_MATH_AVERAGE) {
*Fac = len(Vector1 + Vector2);
*Vector = normalize(Vector1 + Vector2);
}
else if(type == NODE_VECTOR_MATH_DOT_PRODUCT) {
*Fac = dot(Vector1, Vector2);
*Vector = make_float3(0.0f, 0.0f, 0.0f);
}
else if(type == NODE_VECTOR_MATH_CROSS_PRODUCT) {
float3 c = cross(Vector1, Vector2);
*Fac = len(c);
*Vector = normalize(c);
}
else if(type == NODE_VECTOR_MATH_NORMALIZE) {
*Fac = len(Vector1);
*Vector = normalize(Vector1);
}
else {
*Fac = 0.0f;
*Vector = make_float3(0.0f, 0.0f, 0.0f);
}
}
ccl_device float svm_math(NodeMath type, float Fac1, float Fac2)
{
float Fac;
if(type == NODE_MATH_ADD)
Fac = Fac1 + Fac2;
else if(type == NODE_MATH_SUBTRACT)
Fac = Fac1 - Fac2;
else if(type == NODE_MATH_MULTIPLY)
Fac = Fac1*Fac2;
else if(type == NODE_MATH_DIVIDE)
Fac = safe_divide(Fac1, Fac2);
else if(type == NODE_MATH_SINE)
Fac = sinf(Fac1);
else if(type == NODE_MATH_COSINE)
Fac = cosf(Fac1);
else if(type == NODE_MATH_TANGENT)
Fac = tanf(Fac1);
else if(type == NODE_MATH_ARCSINE)
Fac = safe_asinf(Fac1);
else if(type == NODE_MATH_ARCCOSINE)
Fac = safe_acosf(Fac1);
else if(type == NODE_MATH_ARCTANGENT)
Fac = atanf(Fac1);
else if(type == NODE_MATH_POWER)
Fac = safe_powf(Fac1, Fac2);
else if(type == NODE_MATH_LOGARITHM)
Fac = safe_logf(Fac1, Fac2);
else if(type == NODE_MATH_MINIMUM)
Fac = fminf(Fac1, Fac2);
else if(type == NODE_MATH_MAXIMUM)
Fac = fmaxf(Fac1, Fac2);
else if(type == NODE_MATH_ROUND)
Fac = floorf(Fac1 + 0.5f);
else if(type == NODE_MATH_LESS_THAN)
Fac = Fac1 < Fac2;
else if(type == NODE_MATH_GREATER_THAN)
Fac = Fac1 > Fac2;
else if(type == NODE_MATH_MODULO)
Fac = safe_modulo(Fac1, Fac2);
else if(type == NODE_MATH_ABSOLUTE)
Fac = fabsf(Fac1);
else if(type == NODE_MATH_CLAMP)
Fac = saturate(Fac1);
else
Fac = 0.0f;
return Fac;
}
ccl_device float3 svm_math_blackbody_color(float t) {
/* Calculate color in range 800..12000 using an approximation
* a/x+bx+c for R and G and ((at + b)t + c)t + d) for B
* Max absolute error for RGB is (0.00095, 0.00077, 0.00057),
* which is enough to get the same 8 bit/channel color.
*/
const float rc[6][3] = {
{ 2.52432244e+03f, -1.06185848e-03f, 3.11067539e+00f },
{ 3.37763626e+03f, -4.34581697e-04f, 1.64843306e+00f },
{ 4.10671449e+03f, -8.61949938e-05f, 6.41423749e-01f },
{ 4.66849800e+03f, 2.85655028e-05f, 1.29075375e-01f },
{ 4.60124770e+03f, 2.89727618e-05f, 1.48001316e-01f },
{ 3.78765709e+03f, 9.36026367e-06f, 3.98995841e-01f },
};
const float gc[6][3] = {
{ -7.50343014e+02f, 3.15679613e-04f, 4.73464526e-01f },
{ -1.00402363e+03f, 1.29189794e-04f, 9.08181524e-01f },
{ -1.22075471e+03f, 2.56245413e-05f, 1.20753416e+00f },
{ -1.42546105e+03f, -4.01730887e-05f, 1.44002695e+00f },
{ -1.18134453e+03f, -2.18913373e-05f, 1.30656109e+00f },
{ -5.00279505e+02f, -4.59745390e-06f, 1.09090465e+00f },
};
const float bc[6][4] = {
{ 0.0f, 0.0f, 0.0f, 0.0f }, /* zeros should be optimized by compiler */
{ 0.0f, 0.0f, 0.0f, 0.0f },
{ 0.0f, 0.0f, 0.0f, 0.0f },
{ -2.02524603e-11f, 1.79435860e-07f, -2.60561875e-04f, -1.41761141e-02f },
{ -2.22463426e-13f, -1.55078698e-08f, 3.81675160e-04f, -7.30646033e-01f },
{ 6.72595954e-13f, -2.73059993e-08f, 4.24068546e-04f, -7.52204323e-01f },
};
if(t >= 12000.0f)
return make_float3(0.826270103f, 0.994478524f, 1.56626022f);
/* Define a macro to reduce stack usage for nvcc */
#define MAKE_BB_RGB(i) make_float3(\
rc[i][0] / t + rc[i][1] * t + rc[i][2],\
gc[i][0] / t + gc[i][1] * t + gc[i][2],\
((bc[i][0] * t + bc[i][1]) * t + bc[i][2]) * t + bc[i][3])
if(t >= 6365.0f)
return MAKE_BB_RGB(5);
if(t >= 3315.0f)
return MAKE_BB_RGB(4);
if(t >= 1902.0f)
return MAKE_BB_RGB(3);
if(t >= 1449.0f)
return MAKE_BB_RGB(2);
if(t >= 1167.0f)
return MAKE_BB_RGB(1);
if(t >= 965.0f)
return MAKE_BB_RGB(0);
#undef MAKE_BB_RGB
/* For 800 <= t < 965 color does not change in OSL implementation, so keep color the same */
return make_float3(4.70366907f, 0.0f, 0.0f);
}
CCL_NAMESPACE_END
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