diff options
Diffstat (limited to 'intern/cycles/render/blackbody.cpp')
| -rw-r--r-- | intern/cycles/render/blackbody.cpp | 140 |
1 files changed, 0 insertions, 140 deletions
diff --git a/intern/cycles/render/blackbody.cpp b/intern/cycles/render/blackbody.cpp deleted file mode 100644 index 04e6eaf5373..00000000000 --- a/intern/cycles/render/blackbody.cpp +++ /dev/null @@ -1,140 +0,0 @@ -/* - * Adapted from Open Shading Language with this license: - * - * Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al. - * All Rights Reserved. - * - * Modifications Copyright 2013, Blender Foundation. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * * Neither the name of Sony Pictures Imageworks nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include "blackbody.h" -#include "util_color.h" -#include "util_math.h" - -#include "kernel_types.h" - -CCL_NAMESPACE_BEGIN - -vector<float> blackbody_table_build() -{ - /* quoted from OSLs opcolor.cpp - In order to speed up the blackbody computation, we have a table - storing the precomputed BB values for a range of temperatures. Less - than BB_DRAPER always returns 0. Greater than BB_MAX_TABLE_RANGE - does the full computation, we think it'll be rare to inquire higher - temperatures. - - Since the bb function is so nonlinear, we actually space the table - entries nonlinearly, with the relationship between the table index i - and the temperature T as follows: - i = ((T-Draper)/spacing)^(1/xpower) - T = pow(i, xpower) * spacing + Draper - And furthermore, we store in the table the true value raised ^(1/5). - I tuned this a bit, and with the current values we can have all - blackbody results accurate to within 0.1% with a table size of 317 - (about 5 KB of data). - */ - - const float cie_colour_match[81][3] = { - {0.0014f,0.0000f,0.0065f}, {0.0022f,0.0001f,0.0105f}, {0.0042f,0.0001f,0.0201f}, - {0.0076f,0.0002f,0.0362f}, {0.0143f,0.0004f,0.0679f}, {0.0232f,0.0006f,0.1102f}, - {0.0435f,0.0012f,0.2074f}, {0.0776f,0.0022f,0.3713f}, {0.1344f,0.0040f,0.6456f}, - {0.2148f,0.0073f,1.0391f}, {0.2839f,0.0116f,1.3856f}, {0.3285f,0.0168f,1.6230f}, - {0.3483f,0.0230f,1.7471f}, {0.3481f,0.0298f,1.7826f}, {0.3362f,0.0380f,1.7721f}, - {0.3187f,0.0480f,1.7441f}, {0.2908f,0.0600f,1.6692f}, {0.2511f,0.0739f,1.5281f}, - {0.1954f,0.0910f,1.2876f}, {0.1421f,0.1126f,1.0419f}, {0.0956f,0.1390f,0.8130f}, - {0.0580f,0.1693f,0.6162f}, {0.0320f,0.2080f,0.4652f}, {0.0147f,0.2586f,0.3533f}, - {0.0049f,0.3230f,0.2720f}, {0.0024f,0.4073f,0.2123f}, {0.0093f,0.5030f,0.1582f}, - {0.0291f,0.6082f,0.1117f}, {0.0633f,0.7100f,0.0782f}, {0.1096f,0.7932f,0.0573f}, - {0.1655f,0.8620f,0.0422f}, {0.2257f,0.9149f,0.0298f}, {0.2904f,0.9540f,0.0203f}, - {0.3597f,0.9803f,0.0134f}, {0.4334f,0.9950f,0.0087f}, {0.5121f,1.0000f,0.0057f}, - {0.5945f,0.9950f,0.0039f}, {0.6784f,0.9786f,0.0027f}, {0.7621f,0.9520f,0.0021f}, - {0.8425f,0.9154f,0.0018f}, {0.9163f,0.8700f,0.0017f}, {0.9786f,0.8163f,0.0014f}, - {1.0263f,0.7570f,0.0011f}, {1.0567f,0.6949f,0.0010f}, {1.0622f,0.6310f,0.0008f}, - {1.0456f,0.5668f,0.0006f}, {1.0026f,0.5030f,0.0003f}, {0.9384f,0.4412f,0.0002f}, - {0.8544f,0.3810f,0.0002f}, {0.7514f,0.3210f,0.0001f}, {0.6424f,0.2650f,0.0000f}, - {0.5419f,0.2170f,0.0000f}, {0.4479f,0.1750f,0.0000f}, {0.3608f,0.1382f,0.0000f}, - {0.2835f,0.1070f,0.0000f}, {0.2187f,0.0816f,0.0000f}, {0.1649f,0.0610f,0.0000f}, - {0.1212f,0.0446f,0.0000f}, {0.0874f,0.0320f,0.0000f}, {0.0636f,0.0232f,0.0000f}, - {0.0468f,0.0170f,0.0000f}, {0.0329f,0.0119f,0.0000f}, {0.0227f,0.0082f,0.0000f}, - {0.0158f,0.0057f,0.0000f}, {0.0114f,0.0041f,0.0000f}, {0.0081f,0.0029f,0.0000f}, - {0.0058f,0.0021f,0.0000f}, {0.0041f,0.0015f,0.0000f}, {0.0029f,0.0010f,0.0000f}, - {0.0020f,0.0007f,0.0000f}, {0.0014f,0.0005f,0.0000f}, {0.0010f,0.0004f,0.0000f}, - {0.0007f,0.0002f,0.0000f}, {0.0005f,0.0002f,0.0000f}, {0.0003f,0.0001f,0.0000f}, - {0.0002f,0.0001f,0.0000f}, {0.0002f,0.0001f,0.0000f}, {0.0001f,0.0000f,0.0000f}, - {0.0001f,0.0000f,0.0000f}, {0.0001f,0.0000f,0.0000f}, {0.0000f,0.0000f,0.0000f} - }; - - const double c1 = 3.74183e-16; // 2*pi*h*c^2, W*m^2 - const double c2 = 1.4388e-2; // h*c/k, m*K - // h is Planck's const, k is Boltzmann's - const float dlambda = 5.0f * 1e-9f; // in meters - - /* Blackbody table from 800 to 12k Kelvin (319 entries (317+2 offset) * 3) */ - vector<float> blackbody_table(956); - - float X, Y, Z; - - /* ToDo: bring this back to what OSL does with the lastTemperature limit ? */ - for (int i = 0; i <= 317; ++i) { - double Temperature = pow((double)i, (double)BB_TABLE_XPOWER) * (double)BB_TABLE_SPACING + (double)BB_DRAPER; - X = 0; - Y = 0; - Z = 0; - - /* from OSL "spectrum_to_XYZ" */ - for (int n = 0; n < 81; ++n) { - float lambda = 380.0f + 5.0f * n; - double wlm = lambda * 1e-9f; // Wavelength in meters - // N.B. spec_intens returns result in W/m^2 but it's a differential, - // needs to be scaled by dlambda! - float spec_intens = float((c1 * pow(wlm, -5.0)) / (exp(c2 / (wlm * Temperature)) -1.0)); - float Me = spec_intens * dlambda; - - X += Me * cie_colour_match[n][0]; - Y += Me * cie_colour_match[n][1]; - Z += Me * cie_colour_match[n][2]; - } - - /* Convert from xyz color space */ - float3 col = xyz_to_rgb(X, Y, Z); - - /* Clamp to zero if values are smaller */ - col = max(col, make_float3(0.0f, 0.0f, 0.0f)); - - col.x = powf(col.x, 1.0f / BB_TABLE_YPOWER); - col.y = powf(col.y, 1.0f / BB_TABLE_YPOWER); - col.z = powf(col.z, 1.0f / BB_TABLE_YPOWER); - - /* Store in table in RRRGGGBBB format */ - blackbody_table[i] = col.x; - blackbody_table[i+319*1] = col.y; - blackbody_table[i+319*2] = col.z; - } - - return blackbody_table; -} -CCL_NAMESPACE_END |