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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
CCL_NAMESPACE_BEGIN
#ifdef __BAKING__
ccl_device_inline void compute_light_pass(KernelGlobals *kg,
ShaderData *sd,
PathRadiance *L,
RNG rng,
int pass_filter,
int sample)
{
/* initialize master radiance accumulator */
kernel_assert(kernel_data.film.use_light_pass);
path_radiance_init(L, kernel_data.film.use_light_pass);
PathRadiance L_sample;
PathState state;
Ray ray;
float3 throughput = make_float3(1.0f, 1.0f, 1.0f);
/* emission and indirect shader data memory used by various functions */
ShaderData emission_sd, indirect_sd;
ray.P = sd->P + sd->Ng;
ray.D = -sd->Ng;
ray.t = FLT_MAX;
#ifdef __CAMERA_MOTION__
ray.time = 0.5f;
#endif
/* init radiance */
path_radiance_init(&L_sample, kernel_data.film.use_light_pass);
/* init path state */
path_state_init(kg, &emission_sd, &state, &rng, sample, NULL);
/* evaluate surface shader */
float rbsdf = path_state_rng_1D(kg, &rng, &state, PRNG_BSDF);
shader_eval_surface(kg, sd, &rng, &state, rbsdf, state.flag, SHADER_CONTEXT_MAIN);
/* TODO, disable the closures we won't need */
#ifdef __BRANCHED_PATH__
if(!kernel_data.integrator.branched) {
/* regular path tracer */
#endif
/* sample ambient occlusion */
if(pass_filter & BAKE_FILTER_AO) {
kernel_path_ao(kg, sd, &emission_sd, &L_sample, &state, &rng, throughput);
}
/* sample emission */
if((pass_filter & BAKE_FILTER_EMISSION) && (sd->flag & SD_EMISSION)) {
float3 emission = indirect_primitive_emission(kg, sd, 0.0f, state.flag, state.ray_pdf);
path_radiance_accum_emission(&L_sample, throughput, emission, state.bounce);
}
bool is_sss_sample = false;
#ifdef __SUBSURFACE__
/* sample subsurface scattering */
if((pass_filter & BAKE_FILTER_SUBSURFACE) && (sd->flag & SD_BSSRDF)) {
/* when mixing BSSRDF and BSDF closures we should skip BSDF lighting if scattering was successful */
SubsurfaceIndirectRays ss_indirect;
kernel_path_subsurface_init_indirect(&ss_indirect);
if(kernel_path_subsurface_scatter(kg,
sd,
&emission_sd,
&L_sample,
&state,
&rng,
&ray,
&throughput,
&ss_indirect))
{
while(ss_indirect.num_rays) {
kernel_path_subsurface_setup_indirect(kg,
&ss_indirect,
&state,
&ray,
&L_sample,
&throughput);
kernel_path_indirect(kg,
&indirect_sd,
&emission_sd,
&rng,
&ray,
throughput,
state.num_samples,
&state,
&L_sample);
kernel_path_subsurface_accum_indirect(&ss_indirect, &L_sample);
}
is_sss_sample = true;
}
}
#endif
/* sample light and BSDF */
if(!is_sss_sample && (pass_filter & (BAKE_FILTER_DIRECT | BAKE_FILTER_INDIRECT))) {
kernel_path_surface_connect_light(kg, &rng, sd, &emission_sd, throughput, &state, &L_sample);
if(kernel_path_surface_bounce(kg, &rng, sd, &throughput, &state, &L_sample, &ray)) {
#ifdef __LAMP_MIS__
state.ray_t = 0.0f;
#endif
/* compute indirect light */
kernel_path_indirect(kg, &indirect_sd, &emission_sd, &rng, &ray, throughput, 1, &state, &L_sample);
/* sum and reset indirect light pass variables for the next samples */
path_radiance_sum_indirect(&L_sample);
path_radiance_reset_indirect(&L_sample);
}
}
#ifdef __BRANCHED_PATH__
}
else {
/* branched path tracer */
/* sample ambient occlusion */
if(pass_filter & BAKE_FILTER_AO) {
kernel_branched_path_ao(kg, sd, &emission_sd, &L_sample, &state, &rng, throughput);
}
/* sample emission */
if((pass_filter & BAKE_FILTER_EMISSION) && (sd->flag & SD_EMISSION)) {
float3 emission = indirect_primitive_emission(kg, sd, 0.0f, state.flag, state.ray_pdf);
path_radiance_accum_emission(&L_sample, throughput, emission, state.bounce);
}
#ifdef __SUBSURFACE__
/* sample subsurface scattering */
if((pass_filter & BAKE_FILTER_SUBSURFACE) && (sd->flag & SD_BSSRDF)) {
/* when mixing BSSRDF and BSDF closures we should skip BSDF lighting if scattering was successful */
kernel_branched_path_subsurface_scatter(kg, sd, &indirect_sd,
&emission_sd, &L_sample, &state, &rng, &ray, throughput);
}
#endif
/* sample light and BSDF */
if(pass_filter & (BAKE_FILTER_DIRECT | BAKE_FILTER_INDIRECT)) {
#if defined(__EMISSION__)
/* direct light */
if(kernel_data.integrator.use_direct_light) {
int all = kernel_data.integrator.sample_all_lights_direct;
kernel_branched_path_surface_connect_light(kg, &rng,
sd, &emission_sd, &state, throughput, 1.0f, &L_sample, all);
}
#endif
/* indirect light */
kernel_branched_path_surface_indirect_light(kg, &rng,
sd, &indirect_sd, &emission_sd, throughput, 1.0f, &state, &L_sample);
}
}
#endif
/* accumulate into master L */
path_radiance_accum_sample(L, &L_sample, 1);
}
ccl_device bool is_aa_pass(ShaderEvalType type)
{
switch(type) {
case SHADER_EVAL_UV:
case SHADER_EVAL_NORMAL:
return false;
default:
return true;
}
}
/* this helps with AA but it's not the real solution as it does not AA the geometry
* but it's better than nothing, thus committed */
ccl_device_inline float bake_clamp_mirror_repeat(float u, float max)
{
/* use mirror repeat (like opengl texture) so that if the barycentric
* coordinate goes past the end of the triangle it is not always clamped
* to the same value, gives ugly patterns */
u /= max;
float fu = floorf(u);
u = u - fu;
return ((((int)fu) & 1)? 1.0f - u: u) * max;
}
ccl_device_inline float3 kernel_bake_shader_bsdf(KernelGlobals *kg,
ShaderData *sd,
const ShaderEvalType type)
{
switch(type) {
case SHADER_EVAL_DIFFUSE:
return shader_bsdf_diffuse(kg, sd);
case SHADER_EVAL_GLOSSY:
return shader_bsdf_glossy(kg, sd);
case SHADER_EVAL_TRANSMISSION:
return shader_bsdf_transmission(kg, sd);
#ifdef __SUBSURFACE__
case SHADER_EVAL_SUBSURFACE:
return shader_bsdf_subsurface(kg, sd);
#endif
default:
kernel_assert(!"Unknown bake type passed to BSDF evaluate");
return make_float3(0.0f, 0.0f, 0.0f);
}
}
ccl_device float3 kernel_bake_evaluate_direct_indirect(KernelGlobals *kg,
ShaderData *sd,
RNG *rng,
PathState *state,
float3 direct,
float3 indirect,
const ShaderEvalType type,
const int pass_filter)
{
float3 color;
const bool is_color = (pass_filter & BAKE_FILTER_COLOR) != 0;
const bool is_direct = (pass_filter & BAKE_FILTER_DIRECT) != 0;
const bool is_indirect = (pass_filter & BAKE_FILTER_INDIRECT) != 0;
float3 out = make_float3(0.0f, 0.0f, 0.0f);
if(is_color) {
if(is_direct || is_indirect) {
/* Leave direct and diffuse channel colored. */
color = make_float3(1.0f, 1.0f, 1.0f);
}
else {
/* surface color of the pass only */
shader_eval_surface(kg, sd, rng, state, 0.0f, 0, SHADER_CONTEXT_MAIN);
return kernel_bake_shader_bsdf(kg, sd, type);
}
}
else {
shader_eval_surface(kg, sd, rng, state, 0.0f, 0, SHADER_CONTEXT_MAIN);
color = kernel_bake_shader_bsdf(kg, sd, type);
}
if(is_direct) {
out += safe_divide_even_color(direct, color);
}
if(is_indirect) {
out += safe_divide_even_color(indirect, color);
}
return out;
}
ccl_device void kernel_bake_evaluate(KernelGlobals *kg, ccl_global uint4 *input, ccl_global float4 *output,
ShaderEvalType type, int pass_filter, int i, int offset, int sample)
{
ShaderData sd;
PathState state = {0};
uint4 in = input[i * 2];
uint4 diff = input[i * 2 + 1];
float3 out = make_float3(0.0f, 0.0f, 0.0f);
int object = in.x;
int prim = in.y;
if(prim == -1)
return;
float u = __uint_as_float(in.z);
float v = __uint_as_float(in.w);
float dudx = __uint_as_float(diff.x);
float dudy = __uint_as_float(diff.y);
float dvdx = __uint_as_float(diff.z);
float dvdy = __uint_as_float(diff.w);
int num_samples = kernel_data.integrator.aa_samples;
/* random number generator */
RNG rng = cmj_hash(offset + i, kernel_data.integrator.seed);
float filter_x, filter_y;
if(sample == 0) {
filter_x = filter_y = 0.5f;
}
else {
path_rng_2D(kg, &rng, sample, num_samples, PRNG_FILTER_U, &filter_x, &filter_y);
}
/* subpixel u/v offset */
if(sample > 0) {
u = bake_clamp_mirror_repeat(u + dudx*(filter_x - 0.5f) + dudy*(filter_y - 0.5f), 1.0f);
v = bake_clamp_mirror_repeat(v + dvdx*(filter_x - 0.5f) + dvdy*(filter_y - 0.5f), 1.0f - u);
}
/* triangle */
int shader;
float3 P, Ng;
triangle_point_normal(kg, object, prim, u, v, &P, &Ng, &shader);
/* light passes */
PathRadiance L;
shader_setup_from_sample(kg, &sd,
P, Ng, Ng,
shader, object, prim,
u, v, 1.0f, 0.5f,
!(kernel_tex_fetch(__object_flag, object) & SD_TRANSFORM_APPLIED),
LAMP_NONE);
sd.I = sd.N;
/* update differentials */
sd.dP.dx = sd.dPdu * dudx + sd.dPdv * dvdx;
sd.dP.dy = sd.dPdu * dudy + sd.dPdv * dvdy;
sd.du.dx = dudx;
sd.du.dy = dudy;
sd.dv.dx = dvdx;
sd.dv.dy = dvdy;
/* light passes if we need more than color */
if(pass_filter & ~BAKE_FILTER_COLOR)
compute_light_pass(kg, &sd, &L, rng, pass_filter, sample);
switch(type) {
/* data passes */
case SHADER_EVAL_NORMAL:
{
if((sd.flag & SD_HAS_BUMP)) {
shader_eval_surface(kg, &sd, &rng, &state, 0.f, 0, SHADER_CONTEXT_MAIN);
}
/* compression: normal = (2 * color) - 1 */
out = sd.N * 0.5f + make_float3(0.5f, 0.5f, 0.5f);
break;
}
case SHADER_EVAL_UV:
{
out = primitive_uv(kg, &sd);
break;
}
case SHADER_EVAL_EMISSION:
{
shader_eval_surface(kg, &sd, &rng, &state, 0.f, 0, SHADER_CONTEXT_EMISSION);
out = shader_emissive_eval(kg, &sd);
break;
}
#ifdef __PASSES__
/* light passes */
case SHADER_EVAL_AO:
{
out = L.ao;
break;
}
case SHADER_EVAL_COMBINED:
{
if((pass_filter & BAKE_FILTER_COMBINED) == BAKE_FILTER_COMBINED) {
out = path_radiance_clamp_and_sum(kg, &L);
break;
}
if((pass_filter & BAKE_FILTER_DIFFUSE_DIRECT) == BAKE_FILTER_DIFFUSE_DIRECT)
out += L.direct_diffuse;
if((pass_filter & BAKE_FILTER_DIFFUSE_INDIRECT) == BAKE_FILTER_DIFFUSE_INDIRECT)
out += L.indirect_diffuse;
if((pass_filter & BAKE_FILTER_GLOSSY_DIRECT) == BAKE_FILTER_GLOSSY_DIRECT)
out += L.direct_glossy;
if((pass_filter & BAKE_FILTER_GLOSSY_INDIRECT) == BAKE_FILTER_GLOSSY_INDIRECT)
out += L.indirect_glossy;
if((pass_filter & BAKE_FILTER_TRANSMISSION_DIRECT) == BAKE_FILTER_TRANSMISSION_DIRECT)
out += L.direct_transmission;
if((pass_filter & BAKE_FILTER_TRANSMISSION_INDIRECT) == BAKE_FILTER_TRANSMISSION_INDIRECT)
out += L.indirect_transmission;
if((pass_filter & BAKE_FILTER_SUBSURFACE_DIRECT) == BAKE_FILTER_SUBSURFACE_DIRECT)
out += L.direct_subsurface;
if((pass_filter & BAKE_FILTER_SUBSURFACE_INDIRECT) == BAKE_FILTER_SUBSURFACE_INDIRECT)
out += L.indirect_subsurface;
if((pass_filter & BAKE_FILTER_EMISSION) != 0)
out += L.emission;
break;
}
case SHADER_EVAL_SHADOW:
{
out = make_float3(L.shadow.x, L.shadow.y, L.shadow.z);
break;
}
case SHADER_EVAL_DIFFUSE:
{
out = kernel_bake_evaluate_direct_indirect(kg,
&sd,
&rng,
&state,
L.direct_diffuse,
L.indirect_diffuse,
type,
pass_filter);
break;
}
case SHADER_EVAL_GLOSSY:
{
out = kernel_bake_evaluate_direct_indirect(kg,
&sd,
&rng,
&state,
L.direct_glossy,
L.indirect_glossy,
type,
pass_filter);
break;
}
case SHADER_EVAL_TRANSMISSION:
{
out = kernel_bake_evaluate_direct_indirect(kg,
&sd,
&rng,
&state,
L.direct_transmission,
L.indirect_transmission,
type,
pass_filter);
break;
}
case SHADER_EVAL_SUBSURFACE:
{
#ifdef __SUBSURFACE__
out = kernel_bake_evaluate_direct_indirect(kg,
&sd,
&rng,
&state,
L.direct_subsurface,
L.indirect_subsurface,
type,
pass_filter);
#endif
break;
}
#endif
/* extra */
case SHADER_EVAL_ENVIRONMENT:
{
/* setup ray */
Ray ray;
ray.P = make_float3(0.0f, 0.0f, 0.0f);
ray.D = normalize(P);
ray.t = 0.0f;
#ifdef __CAMERA_MOTION__
ray.time = 0.5f;
#endif
#ifdef __RAY_DIFFERENTIALS__
ray.dD = differential3_zero();
ray.dP = differential3_zero();
#endif
/* setup shader data */
shader_setup_from_background(kg, &sd, &ray);
/* evaluate */
int flag = 0; /* we can't know which type of BSDF this is for */
out = shader_eval_background(kg, &sd, &state, flag, SHADER_CONTEXT_MAIN);
break;
}
default:
{
/* no real shader, returning the position of the verts for debugging */
out = normalize(P);
break;
}
}
/* write output */
const float output_fac = is_aa_pass(type)? 1.0f/num_samples: 1.0f;
const float4 scaled_result = make_float4(out.x, out.y, out.z, 1.0f) * output_fac;
output[i] = (sample == 0)? scaled_result: output[i] + scaled_result;
}
#endif /* __BAKING__ */
ccl_device void kernel_shader_evaluate(KernelGlobals *kg,
ccl_global uint4 *input,
ccl_global float4 *output,
ccl_global float *output_luma,
ShaderEvalType type,
int i,
int sample)
{
ShaderData sd;
PathState state = {0};
uint4 in = input[i];
float3 out;
if(type == SHADER_EVAL_DISPLACE) {
/* setup shader data */
int object = in.x;
int prim = in.y;
float u = __uint_as_float(in.z);
float v = __uint_as_float(in.w);
shader_setup_from_displace(kg, &sd, object, prim, u, v);
/* evaluate */
float3 P = sd.P;
shader_eval_displacement(kg, &sd, &state, SHADER_CONTEXT_MAIN);
out = sd.P - P;
object_inverse_dir_transform(kg, &sd, &out);
}
else { // SHADER_EVAL_BACKGROUND
/* setup ray */
Ray ray;
float u = __uint_as_float(in.x);
float v = __uint_as_float(in.y);
ray.P = make_float3(0.0f, 0.0f, 0.0f);
ray.D = equirectangular_to_direction(u, v);
ray.t = 0.0f;
#ifdef __CAMERA_MOTION__
ray.time = 0.5f;
#endif
#ifdef __RAY_DIFFERENTIALS__
ray.dD = differential3_zero();
ray.dP = differential3_zero();
#endif
/* setup shader data */
shader_setup_from_background(kg, &sd, &ray);
/* evaluate */
int flag = 0; /* we can't know which type of BSDF this is for */
out = shader_eval_background(kg, &sd, &state, flag, SHADER_CONTEXT_MAIN);
}
/* write output */
if(sample == 0) {
if(output != NULL) {
output[i] = make_float4(out.x, out.y, out.z, 0.0f);
}
if(output_luma != NULL) {
output_luma[i] = average(out);
}
}
else {
if(output != NULL) {
output[i] += make_float4(out.x, out.y, out.z, 0.0f);
}
if(output_luma != NULL) {
output_luma[i] += average(out);
}
}
}
CCL_NAMESPACE_END
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