OSL_SHADEOP void osl_luminance_dfdv (void *sg, void *out, void *c)
{
ShadingContext *ctx = (ShadingContext *)((ShaderGlobals *)sg)->context;
((float *)out)[0] = ctx->shadingsys().luminance (((const Color3 *)c)[0]);
((float *)out)[1] = ctx->shadingsys().luminance (((const Color3 *)c)[1]);
((float *)out)[2] = ctx->shadingsys().luminance (((const Color3 *)c)[2]);
}
OSL_SHADEOP void
osl_prepend_color_from (void *sg, void *c_, const char *from)
{
ShadingContext *ctx (((ShaderGlobals *)sg)->context);
Color3 &c (*(Color3*)c_);
c = ctx->shadingsys().to_rgb (USTR(from), c[0], c[1], c[2]);
}
OSL_SHADEOP void osl_wavelength_color_vf (void *sg, void *out, float lambda)
{
ShadingContext *ctx = (ShadingContext *)((ShaderGlobals *)sg)->context;
Color3 rgb = ctx->shadingsys().XYZ_to_RGB (wavelength_color_XYZ (lambda));
// constrain_rgb (rgb);
rgb *= 1.0/2.52; // Empirical scale from lg to make all comps <= 1
// norm_rgb (rgb);
clamp_zero (rgb);
*(Color3 *)out = rgb;
}
OSL_SHADEOP void osl_blackbody_vf (void *sg, void *out, float temp)
{
ShadingContext *ctx = (ShadingContext *)((ShaderGlobals *)sg)->context;
*(Color3 *)out = ctx->shadingsys().blackbody_rgb (temp);
}