Differential D13361 Diff 45286 intern/cycles/kernel/svm/math_util.h

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intern/cycles/kernel/svm/math_util.h

Show First 20 Lines • Show All 206 Lines • ▼ Show 20 Lines	ccl_device float3 svm_math_blackbody_color(float t)
/* TODO(lukas): Reimplement in XYZ. */		/* TODO(lukas): Reimplement in XYZ. */

/* Calculate color in range 800..12000 using an approximation		/* 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		* 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),		* Max absolute error for RGB is (0.00095, 0.00077, 0.00057),
* which is enough to get the same 8 bit/channel color.		* which is enough to get the same 8 bit/channel color.
*/		*/

const float blackbody_table_r[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 blackbody_table_g[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 blackbody_table_b[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) {		if (t >= 12000.0f) {
return make_float3(0.826270103f, 0.994478524f, 1.56626022f);		return make_float3(0.826270103f, 0.994478524f, 1.56626022f);
}		}
else if (t < 965.0f) {		else if (t < 965.0f) {
/* For 800 <= t < 965 color does not change in OSL implementation, so keep color the same */		/* 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);		return make_float3(4.70366907f, 0.0f, 0.0f);
}		}

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