d832d993c5
These replace float3 and packed_float3 in various places in the kernel where a spectral color representation will be used in the future. That representation will require more than 3 channels and conversion to from/RGB. The kernel code was refactored to remove the assumption that Spectrum and RGB colors are the same thing. There are no functional changes, Spectrum is still a float3 and the conversion functions are no-ops. Differential Revision: https://developer.blender.org/D15535
107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Adapted from Open Shading Language
|
|
* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
|
|
* All Rights Reserved.
|
|
*
|
|
* Modifications Copyright 2011-2022 Blender Foundation. */
|
|
|
|
#pragma once
|
|
|
|
#include "kernel/sample/mapping.h"
|
|
#include "kernel/util/color.h"
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
#ifdef __OSL__
|
|
|
|
typedef struct DiffuseRampBsdf {
|
|
SHADER_CLOSURE_BASE;
|
|
|
|
ccl_private float3 *colors;
|
|
} DiffuseRampBsdf;
|
|
|
|
static_assert(sizeof(ShaderClosure) >= sizeof(DiffuseRampBsdf), "DiffuseRampBsdf is too large!");
|
|
|
|
ccl_device float3 bsdf_diffuse_ramp_get_color(const float3 colors[8], float pos)
|
|
{
|
|
int MAXCOLORS = 8;
|
|
|
|
float npos = pos * (float)(MAXCOLORS - 1);
|
|
int ipos = float_to_int(npos);
|
|
if (ipos < 0)
|
|
return colors[0];
|
|
if (ipos >= (MAXCOLORS - 1))
|
|
return colors[MAXCOLORS - 1];
|
|
float offset = npos - (float)ipos;
|
|
return colors[ipos] * (1.0f - offset) + colors[ipos + 1] * offset;
|
|
}
|
|
|
|
ccl_device int bsdf_diffuse_ramp_setup(DiffuseRampBsdf *bsdf)
|
|
{
|
|
bsdf->type = CLOSURE_BSDF_DIFFUSE_RAMP_ID;
|
|
return SD_BSDF | SD_BSDF_HAS_EVAL;
|
|
}
|
|
|
|
ccl_device void bsdf_diffuse_ramp_blur(ccl_private ShaderClosure *sc, float roughness)
|
|
{
|
|
}
|
|
|
|
ccl_device Spectrum bsdf_diffuse_ramp_eval_reflect(ccl_private const ShaderClosure *sc,
|
|
const float3 I,
|
|
const float3 omega_in,
|
|
ccl_private float *pdf)
|
|
{
|
|
const DiffuseRampBsdf *bsdf = (const DiffuseRampBsdf *)sc;
|
|
float3 N = bsdf->N;
|
|
|
|
float cos_pi = fmaxf(dot(N, omega_in), 0.0f);
|
|
*pdf = cos_pi * M_1_PI_F;
|
|
return rgb_to_spectrum(bsdf_diffuse_ramp_get_color(bsdf->colors, cos_pi) * M_1_PI_F);
|
|
}
|
|
|
|
ccl_device Spectrum bsdf_diffuse_ramp_eval_transmit(ccl_private const ShaderClosure *sc,
|
|
const float3 I,
|
|
const float3 omega_in,
|
|
ccl_private float *pdf)
|
|
{
|
|
return zero_spectrum();
|
|
}
|
|
|
|
ccl_device int bsdf_diffuse_ramp_sample(ccl_private const ShaderClosure *sc,
|
|
float3 Ng,
|
|
float3 I,
|
|
float3 dIdx,
|
|
float3 dIdy,
|
|
float randu,
|
|
float randv,
|
|
ccl_private Spectrum *eval,
|
|
ccl_private float3 *omega_in,
|
|
ccl_private float3 *domega_in_dx,
|
|
ccl_private float3 *domega_in_dy,
|
|
ccl_private float *pdf)
|
|
{
|
|
const DiffuseRampBsdf *bsdf = (const DiffuseRampBsdf *)sc;
|
|
float3 N = bsdf->N;
|
|
|
|
// distribution over the hemisphere
|
|
sample_cos_hemisphere(N, randu, randv, omega_in, pdf);
|
|
|
|
if (dot(Ng, *omega_in) > 0.0f) {
|
|
*eval = rgb_to_spectrum(bsdf_diffuse_ramp_get_color(bsdf->colors, *pdf * M_PI_F) * M_1_PI_F);
|
|
# ifdef __RAY_DIFFERENTIALS__
|
|
*domega_in_dx = (2 * dot(N, dIdx)) * N - dIdx;
|
|
*domega_in_dy = (2 * dot(N, dIdy)) * N - dIdy;
|
|
# endif
|
|
}
|
|
else {
|
|
*pdf = 0.0f;
|
|
*eval = zero_spectrum();
|
|
}
|
|
return LABEL_REFLECT | LABEL_DIFFUSE;
|
|
}
|
|
|
|
#endif /* __OSL__ */
|
|
|
|
CCL_NAMESPACE_END
|