d1f944c186
MSL requires that constant address space literals be declared at program scope. This patch moves the `blackbody_table_r/g/b` and `cie_colour_match` constants into separate files so they can be declared at the appropriate scope. Ref T92212 Differential Revision: https://developer.blender.org/D13241
69 lines
2.7 KiB
C
69 lines
2.7 KiB
C
/*
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* Adapted from Open Shading Language with this license:
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*
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* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
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* All Rights Reserved.
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*
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* Modifications Copyright 2013, Blender Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Sony Pictures Imageworks nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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CCL_NAMESPACE_BEGIN
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/* Wavelength to RGB */
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ccl_device_noinline void svm_node_wavelength(KernelGlobals kg,
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ccl_private ShaderData *sd,
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ccl_private float *stack,
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uint wavelength,
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uint color_out)
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{
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float lambda_nm = stack_load_float(stack, wavelength);
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float ii = (lambda_nm - 380.0f) * (1.0f / 5.0f); // scaled 0..80
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int i = float_to_int(ii);
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float3 color;
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if (i < 0 || i >= 80) {
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color = make_float3(0.0f, 0.0f, 0.0f);
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}
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else {
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ii -= i;
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ccl_constant float *c = cie_colour_match[i];
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color = interp(make_float3(c[0], c[1], c[2]), make_float3(c[3], c[4], c[5]), ii);
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}
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color = xyz_to_rgb(kg, color);
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color *= 1.0f / 2.52f; // Empirical scale from lg to make all comps <= 1
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/* Clamp to zero if values are smaller */
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color = max(color, make_float3(0.0f, 0.0f, 0.0f));
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stack_store_float3(stack, color_out, color);
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}
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CCL_NAMESPACE_END
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