diff options
Diffstat (limited to 'intern/cycles/kernel/integrator/shade_surface.h')
| -rw-r--r-- | intern/cycles/kernel/integrator/shade_surface.h | 231 |
1 files changed, 133 insertions, 98 deletions
diff --git a/intern/cycles/kernel/integrator/shade_surface.h b/intern/cycles/kernel/integrator/shade_surface.h index ce1398859b7..c19f56a9b70 100644 --- a/intern/cycles/kernel/integrator/shade_surface.h +++ b/intern/cycles/kernel/integrator/shade_surface.h @@ -3,14 +3,15 @@ #pragma once -#include "kernel/film/accumulate.h" -#include "kernel/film/passes.h" +#include "kernel/film/data_passes.h" +#include "kernel/film/denoising_passes.h" +#include "kernel/film/light_passes.h" #include "kernel/integrator/mnee.h" #include "kernel/integrator/path_state.h" -#include "kernel/integrator/shader_eval.h" #include "kernel/integrator/subsurface.h" +#include "kernel/integrator/surface_shader.h" #include "kernel/integrator/volume_stack.h" #include "kernel/light/light.h" @@ -31,7 +32,52 @@ ccl_device_forceinline void integrate_surface_shader_setup(KernelGlobals kg, shader_setup_from_ray(kg, sd, &ray, &isect); } -#ifdef __HOLDOUT__ +ccl_device_forceinline float3 integrate_surface_ray_offset(KernelGlobals kg, + const ccl_private ShaderData *sd, + const float3 ray_P, + const float3 ray_D) +{ + /* No ray offset needed for other primitive types. */ + if (!(sd->type & PRIMITIVE_TRIANGLE)) { + return ray_P; + } + + /* Self intersection tests already account for the case where a ray hits the + * same primitive. However precision issues can still cause neighboring + * triangles to be hit. Here we test if the ray-triangle intersection with + * the same primitive would miss, implying that a neighboring triangle would + * be hit instead. + * + * This relies on triangle intersection to be watertight, and the object inverse + * object transform to match the one used by ray intersection exactly. + * + * Potential improvements: + * - It appears this happens when either barycentric coordinates are small, + * or dot(sd->Ng, ray_D) is small. Detect such cases and skip test? + * - Instead of ray offset, can we tweak P to lie within the triangle? + */ + const uint tri_vindex = kernel_data_fetch(tri_vindex, sd->prim).w; + const packed_float3 tri_a = kernel_data_fetch(tri_verts, tri_vindex + 0), + tri_b = kernel_data_fetch(tri_verts, tri_vindex + 1), + tri_c = kernel_data_fetch(tri_verts, tri_vindex + 2); + + float3 local_ray_P = ray_P; + float3 local_ray_D = ray_D; + + if (!(sd->object_flag & SD_OBJECT_TRANSFORM_APPLIED)) { + const Transform itfm = object_get_inverse_transform(kg, sd); + local_ray_P = transform_point(&itfm, local_ray_P); + local_ray_D = transform_direction(&itfm, local_ray_D); + } + + if (ray_triangle_intersect_self(local_ray_P, local_ray_D, tri_a, tri_b, tri_c)) { + return ray_P; + } + else { + return ray_offset(ray_P, sd->Ng); + } +} + ccl_device_forceinline bool integrate_surface_holdout(KernelGlobals kg, ConstIntegratorState state, ccl_private ShaderData *sd, @@ -42,22 +88,18 @@ ccl_device_forceinline bool integrate_surface_holdout(KernelGlobals kg, if (((sd->flag & SD_HOLDOUT) || (sd->object_flag & SD_OBJECT_HOLDOUT_MASK)) && (path_flag & PATH_RAY_TRANSPARENT_BACKGROUND)) { - const float3 holdout_weight = shader_holdout_apply(kg, sd); - if (kernel_data.background.transparent) { - const float3 throughput = INTEGRATOR_STATE(state, path, throughput); - const float transparent = average(holdout_weight * throughput); - kernel_accum_holdout(kg, state, path_flag, transparent, render_buffer); - } - if (isequal_float3(holdout_weight, one_float3())) { + const Spectrum holdout_weight = surface_shader_apply_holdout(kg, sd); + const Spectrum throughput = INTEGRATOR_STATE(state, path, throughput); + const float transparent = average(holdout_weight * throughput); + film_write_holdout(kg, state, path_flag, transparent, render_buffer); + if (isequal(holdout_weight, one_spectrum())) { return false; } } return true; } -#endif /* __HOLDOUT__ */ -#ifdef __EMISSION__ ccl_device_forceinline void integrate_surface_emission(KernelGlobals kg, ConstIntegratorState state, ccl_private const ShaderData *sd, @@ -67,32 +109,29 @@ ccl_device_forceinline void integrate_surface_emission(KernelGlobals kg, const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag); /* Evaluate emissive closure. */ - float3 L = shader_emissive_eval(sd); + Spectrum L = surface_shader_emission(sd); + float mis_weight = 1.0f; -# ifdef __HAIR__ +#ifdef __HAIR__ if (!(path_flag & PATH_RAY_MIS_SKIP) && (sd->flag & SD_USE_MIS) && (sd->type & PRIMITIVE_TRIANGLE)) -# else +#else if (!(path_flag & PATH_RAY_MIS_SKIP) && (sd->flag & SD_USE_MIS)) -# endif +#endif { const float bsdf_pdf = INTEGRATOR_STATE(state, path, mis_ray_pdf); - const float t = sd->ray_length + INTEGRATOR_STATE(state, path, mis_ray_t); + const float t = sd->ray_length; /* Multiple importance sampling, get triangle light pdf, * and compute weight with respect to BSDF pdf. */ float pdf = triangle_light_pdf(kg, sd, t); - float mis_weight = light_sample_mis_weight_forward(kg, bsdf_pdf, pdf); - L *= mis_weight; + mis_weight = light_sample_mis_weight_forward(kg, bsdf_pdf, pdf); } - const float3 throughput = INTEGRATOR_STATE(state, path, throughput); - kernel_accum_emission( - kg, state, throughput * L, render_buffer, object_lightgroup(kg, sd->object)); + film_write_surface_emission( + kg, state, L, mis_weight, render_buffer, object_lightgroup(kg, sd->object)); } -#endif /* __EMISSION__ */ -#ifdef __EMISSION__ /* Path tracing: sample point on light and evaluate light shader, then * queue shadow ray to be traced. */ template<uint node_feature_mask> @@ -111,11 +150,10 @@ ccl_device_forceinline void integrate_surface_direct_light(KernelGlobals kg, { const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag); const uint bounce = INTEGRATOR_STATE(state, path, bounce); - float light_u, light_v; - path_state_rng_2D(kg, rng_state, PRNG_LIGHT_U, &light_u, &light_v); + const float2 rand_light = path_state_rng_2D(kg, rng_state, PRNG_LIGHT); if (!light_distribution_sample_from_position( - kg, light_u, light_v, sd->time, sd->P, bounce, path_flag, &ls)) { + kg, rand_light.x, rand_light.y, sd->time, sd->P, bounce, path_flag, &ls)) { return; } } @@ -133,15 +171,15 @@ ccl_device_forceinline void integrate_surface_direct_light(KernelGlobals kg, Ray ray ccl_optional_struct_init; BsdfEval bsdf_eval ccl_optional_struct_init; - const bool is_transmission = shader_bsdf_is_transmission(sd, ls.D); + const bool is_transmission = surface_shader_is_transmission(sd, ls.D); -# ifdef __MNEE__ +#ifdef __MNEE__ int mnee_vertex_count = 0; IF_KERNEL_FEATURE(MNEE) { if (ls.lamp != LAMP_NONE) { /* Is this a caustic light? */ - const bool use_caustics = kernel_tex_fetch(__lights, ls.lamp).use_caustics; + const bool use_caustics = kernel_data_fetch(lights, ls.lamp).use_caustics; if (use_caustics) { /* Are we on a caustic caster? */ if (is_transmission && (sd->object_flag & SD_OBJECT_CAUSTICS_CASTER)) @@ -161,16 +199,17 @@ ccl_device_forceinline void integrate_surface_direct_light(KernelGlobals kg, light_sample_to_surface_shadow_ray(kg, emission_sd, &ls, &ray); } else -# endif /* __MNEE__ */ +#endif /* __MNEE__ */ { - const float3 light_eval = light_sample_shader_eval(kg, state, emission_sd, &ls, sd->time); + const Spectrum light_eval = light_sample_shader_eval(kg, state, emission_sd, &ls, sd->time); if (is_zero(light_eval)) { return; } /* Evaluate BSDF. */ - const float bsdf_pdf = shader_bsdf_eval(kg, sd, ls.D, is_transmission, &bsdf_eval, ls.shader); - bsdf_eval_mul3(&bsdf_eval, light_eval / ls.pdf); + const float bsdf_pdf = surface_shader_bsdf_eval( + kg, sd, ls.D, is_transmission, &bsdf_eval, ls.shader); + bsdf_eval_mul(&bsdf_eval, light_eval / ls.pdf); if (ls.shader & SHADER_USE_MIS) { const float mis_weight = light_sample_mis_weight_nee(kg, ls.pdf, bsdf_pdf); @@ -190,16 +229,20 @@ ccl_device_forceinline void integrate_surface_direct_light(KernelGlobals kg, const bool is_light = light_sample_is_light(&ls); /* Branch off shadow kernel. */ - INTEGRATOR_SHADOW_PATH_INIT( - shadow_state, state, DEVICE_KERNEL_INTEGRATOR_INTERSECT_SHADOW, shadow); + IntegratorShadowState shadow_state = integrator_shadow_path_init( + kg, state, DEVICE_KERNEL_INTEGRATOR_INTERSECT_SHADOW, false); /* Copy volume stack and enter/exit volume. */ integrator_state_copy_volume_stack_to_shadow(kg, shadow_state, state); if (is_transmission) { -# ifdef __VOLUME__ +#ifdef __VOLUME__ shadow_volume_stack_enter_exit(kg, shadow_state, sd); -# endif +#endif + } + + if (ray.self.object != OBJECT_NONE) { + ray.P = integrate_surface_ray_offset(kg, sd, ray.P, ray.D); } /* Write shadow ray and associated state to global memory. */ @@ -213,11 +256,12 @@ ccl_device_forceinline void integrate_surface_direct_light(KernelGlobals kg, /* Copy state from main path to shadow path. */ uint32_t shadow_flag = INTEGRATOR_STATE(state, path, flag); shadow_flag |= (is_light) ? PATH_RAY_SHADOW_FOR_LIGHT : 0; - const float3 throughput = INTEGRATOR_STATE(state, path, throughput) * bsdf_eval_sum(&bsdf_eval); + const Spectrum throughput = INTEGRATOR_STATE(state, path, throughput) * + bsdf_eval_sum(&bsdf_eval); if (kernel_data.kernel_features & KERNEL_FEATURE_LIGHT_PASSES) { - packed_float3 pass_diffuse_weight; - packed_float3 pass_glossy_weight; + PackedSpectrum pass_diffuse_weight; + PackedSpectrum pass_glossy_weight; if (shadow_flag & PATH_RAY_ANY_PASS) { /* Indirect bounce, use weights from earlier surface or volume bounce. */ @@ -227,8 +271,8 @@ ccl_device_forceinline void integrate_surface_direct_light(KernelGlobals kg, else { /* Direct light, use BSDFs at this bounce. */ shadow_flag |= PATH_RAY_SURFACE_PASS; - pass_diffuse_weight = packed_float3(bsdf_eval_pass_diffuse_weight(&bsdf_eval)); - pass_glossy_weight = packed_float3(bsdf_eval_pass_glossy_weight(&bsdf_eval)); + pass_diffuse_weight = PackedSpectrum(bsdf_eval_pass_diffuse_weight(&bsdf_eval)); + pass_glossy_weight = PackedSpectrum(bsdf_eval_pass_glossy_weight(&bsdf_eval)); } INTEGRATOR_STATE_WRITE(shadow_state, shadow_path, pass_diffuse_weight) = pass_diffuse_weight; @@ -250,7 +294,7 @@ ccl_device_forceinline void integrate_surface_direct_light(KernelGlobals kg, INTEGRATOR_STATE_WRITE(shadow_state, shadow_path, glossy_bounce) = INTEGRATOR_STATE( state, path, glossy_bounce); -# ifdef __MNEE__ +#ifdef __MNEE__ if (mnee_vertex_count > 0) { INTEGRATOR_STATE_WRITE(shadow_state, shadow_path, transmission_bounce) = INTEGRATOR_STATE(state, path, transmission_bounce) + mnee_vertex_count - 1; @@ -262,7 +306,7 @@ ccl_device_forceinline void integrate_surface_direct_light(KernelGlobals kg, bounce) = INTEGRATOR_STATE(state, path, bounce) + mnee_vertex_count; } else -# endif +#endif { INTEGRATOR_STATE_WRITE(shadow_state, shadow_path, transmission_bounce) = INTEGRATOR_STATE( state, path, transmission_bounce); @@ -284,7 +328,6 @@ ccl_device_forceinline void integrate_surface_direct_light(KernelGlobals kg, ls.group + 1 : kernel_data.background.lightgroup + 1; } -#endif /* Path tracing: bounce off or through surface with new direction. */ ccl_device_forceinline int integrate_surface_bsdf_bssrdf_bounce( @@ -298,9 +341,8 @@ ccl_device_forceinline int integrate_surface_bsdf_bssrdf_bounce( return LABEL_NONE; } - float bsdf_u, bsdf_v; - path_state_rng_2D(kg, rng_state, PRNG_BSDF_U, &bsdf_u, &bsdf_v); - ccl_private const ShaderClosure *sc = shader_bsdf_bssrdf_pick(sd, &bsdf_u); + float2 rand_bsdf = path_state_rng_2D(kg, rng_state, PRNG_SURFACE_BSDF); + ccl_private const ShaderClosure *sc = surface_shader_bsdf_bssrdf_pick(sd, &rand_bsdf); #ifdef __SUBSURFACE__ /* BSSRDF closure, we schedule subsurface intersection kernel. */ @@ -313,29 +355,33 @@ ccl_device_forceinline int integrate_surface_bsdf_bssrdf_bounce( float bsdf_pdf; BsdfEval bsdf_eval ccl_optional_struct_init; float3 bsdf_omega_in ccl_optional_struct_init; - differential3 bsdf_domega_in ccl_optional_struct_init; int label; - label = shader_bsdf_sample_closure( - kg, sd, sc, bsdf_u, bsdf_v, &bsdf_eval, &bsdf_omega_in, &bsdf_domega_in, &bsdf_pdf); + label = surface_shader_bsdf_sample_closure( + kg, sd, sc, rand_bsdf, &bsdf_eval, &bsdf_omega_in, &bsdf_pdf); if (bsdf_pdf == 0.0f || bsdf_eval_is_zero(&bsdf_eval)) { return LABEL_NONE; } - /* Setup ray. Note that clipping works through transparent bounces. */ - INTEGRATOR_STATE_WRITE(state, ray, P) = sd->P; - INTEGRATOR_STATE_WRITE(state, ray, D) = normalize(bsdf_omega_in); - INTEGRATOR_STATE_WRITE(state, ray, t) = (label & LABEL_TRANSPARENT) ? - INTEGRATOR_STATE(state, ray, t) - sd->ray_length : - FLT_MAX; + if (label & LABEL_TRANSPARENT) { + /* Only need to modify start distance for transparent. */ + INTEGRATOR_STATE_WRITE(state, ray, tmin) = intersection_t_offset(sd->ray_length); + } + else { + /* Setup ray with changed origin and direction. */ + const float3 D = normalize(bsdf_omega_in); + INTEGRATOR_STATE_WRITE(state, ray, P) = integrate_surface_ray_offset(kg, sd, sd->P, D); + INTEGRATOR_STATE_WRITE(state, ray, D) = D; + INTEGRATOR_STATE_WRITE(state, ray, tmin) = 0.0f; + INTEGRATOR_STATE_WRITE(state, ray, tmax) = FLT_MAX; #ifdef __RAY_DIFFERENTIALS__ - INTEGRATOR_STATE_WRITE(state, ray, dP) = differential_make_compact(sd->dP); - INTEGRATOR_STATE_WRITE(state, ray, dD) = differential_make_compact(bsdf_domega_in); + INTEGRATOR_STATE_WRITE(state, ray, dP) = differential_make_compact(sd->dP); #endif + } /* Update throughput. */ - float3 throughput = INTEGRATOR_STATE(state, path, throughput); + Spectrum throughput = INTEGRATOR_STATE(state, path, throughput); throughput *= bsdf_eval_sum(&bsdf_eval) / bsdf_pdf; INTEGRATOR_STATE_WRITE(state, path, throughput) = throughput; @@ -349,12 +395,8 @@ ccl_device_forceinline int integrate_surface_bsdf_bssrdf_bounce( } /* Update path state */ - if (label & LABEL_TRANSPARENT) { - INTEGRATOR_STATE_WRITE(state, path, mis_ray_t) += sd->ray_length; - } - else { + if (!(label & LABEL_TRANSPARENT)) { INTEGRATOR_STATE_WRITE(state, path, mis_ray_pdf) = bsdf_pdf; - INTEGRATOR_STATE_WRITE(state, path, mis_ray_t) = 0.0f; INTEGRATOR_STATE_WRITE(state, path, min_ray_pdf) = fminf( bsdf_pdf, INTEGRATOR_STATE(state, path, min_ray_pdf)); } @@ -371,17 +413,8 @@ ccl_device_forceinline int integrate_surface_volume_only_bounce(IntegratorState return LABEL_NONE; } - /* Setup ray position, direction stays unchanged. */ - INTEGRATOR_STATE_WRITE(state, ray, P) = sd->P; - - /* Clipping works through transparent. */ - INTEGRATOR_STATE_WRITE(state, ray, t) -= sd->ray_length; - -# ifdef __RAY_DIFFERENTIALS__ - INTEGRATOR_STATE_WRITE(state, ray, dP) = differential_make_compact(sd->dP); -# endif - - INTEGRATOR_STATE_WRITE(state, path, mis_ray_t) += sd->ray_length; + /* Only modify start distance. */ + INTEGRATOR_STATE_WRITE(state, ray, tmin) = intersection_t_offset(sd->ray_length); return LABEL_TRANSMIT | LABEL_TRANSPARENT; } @@ -416,23 +449,26 @@ ccl_device_forceinline void integrate_surface_ao(KernelGlobals kg, return; } - float bsdf_u, bsdf_v; - path_state_rng_2D(kg, rng_state, PRNG_BSDF_U, &bsdf_u, &bsdf_v); + const float2 rand_bsdf = path_state_rng_2D(kg, rng_state, PRNG_SURFACE_BSDF); float3 ao_N; - const float3 ao_weight = shader_bsdf_ao( + const Spectrum ao_weight = surface_shader_ao( kg, sd, kernel_data.integrator.ao_additive_factor, &ao_N); float3 ao_D; float ao_pdf; - sample_cos_hemisphere(ao_N, bsdf_u, bsdf_v, &ao_D, &ao_pdf); + sample_cos_hemisphere(ao_N, rand_bsdf.x, rand_bsdf.y, &ao_D, &ao_pdf); bool skip_self = true; Ray ray ccl_optional_struct_init; ray.P = shadow_ray_offset(kg, sd, ao_D, &skip_self); ray.D = ao_D; - ray.t = kernel_data.integrator.ao_bounces_distance; + if (skip_self) { + ray.P = integrate_surface_ray_offset(kg, sd, ray.P, ray.D); + } + ray.tmin = 0.0f; + ray.tmax = kernel_data.integrator.ao_bounces_distance; ray.time = sd->time; ray.self.object = (skip_self) ? sd->object : OBJECT_NONE; ray.self.prim = (skip_self) ? sd->prim : PRIM_NONE; @@ -442,7 +478,8 @@ ccl_device_forceinline void integrate_surface_ao(KernelGlobals kg, ray.dD = differential_zero_compact(); /* Branch off shadow kernel. */ - INTEGRATOR_SHADOW_PATH_INIT(shadow_state, state, DEVICE_KERNEL_INTEGRATOR_INTERSECT_SHADOW, ao); + IntegratorShadowState shadow_state = integrator_shadow_path_init( + kg, state, DEVICE_KERNEL_INTEGRATOR_INTERSECT_SHADOW, true); /* Copy volume stack and enter/exit volume. */ integrator_state_copy_volume_stack_to_shadow(kg, shadow_state, state); @@ -458,7 +495,8 @@ ccl_device_forceinline void integrate_surface_ao(KernelGlobals kg, const uint16_t bounce = INTEGRATOR_STATE(state, path, bounce); const uint16_t transparent_bounce = INTEGRATOR_STATE(state, path, transparent_bounce); uint32_t shadow_flag = INTEGRATOR_STATE(state, path, flag) | PATH_RAY_SHADOW_FOR_AO; - const float3 throughput = INTEGRATOR_STATE(state, path, throughput) * shader_bsdf_alpha(kg, sd); + const Spectrum throughput = INTEGRATOR_STATE(state, path, throughput) * + surface_shader_alpha(kg, sd); INTEGRATOR_STATE_WRITE(shadow_state, shadow_path, render_pixel_index) = INTEGRATOR_STATE( state, path, render_pixel_index); @@ -507,7 +545,7 @@ ccl_device bool integrate_surface(KernelGlobals kg, { /* Evaluate shader. */ PROFILING_EVENT(PROFILING_SHADE_SURFACE_EVAL); - shader_eval_surface<node_feature_mask>(kg, state, &sd, render_buffer, path_flag); + surface_shader_eval<node_feature_mask>(kg, state, &sd, render_buffer, path_flag); /* Initialize additional RNG for BSDFs. */ if (sd.flag & SD_BSDF_NEEDS_LCG) { @@ -529,21 +567,17 @@ ccl_device bool integrate_surface(KernelGlobals kg, #endif { /* Filter closures. */ - shader_prepare_surface_closures(kg, state, &sd, path_flag); + surface_shader_prepare_closures(kg, state, &sd, path_flag); -#ifdef __HOLDOUT__ /* Evaluate holdout. */ if (!integrate_surface_holdout(kg, state, &sd, render_buffer)) { return false; } -#endif -#ifdef __EMISSION__ /* Write emission. */ if (sd.flag & SD_EMISSION) { integrate_surface_emission(kg, state, &sd, render_buffer); } -#endif /* Perform path termination. Most paths have already been terminated in * the intersect_closest kernel, this is just for emission and for dividing @@ -557,11 +591,11 @@ ccl_device bool integrate_surface(KernelGlobals kg, /* Write render passes. */ #ifdef __PASSES__ PROFILING_EVENT(PROFILING_SHADE_SURFACE_PASSES); - kernel_write_data_passes(kg, state, &sd, render_buffer); + film_write_data_passes(kg, state, &sd, render_buffer); #endif #ifdef __DENOISING_FEATURES__ - kernel_write_denoising_features_surface(kg, state, &sd, render_buffer); + film_write_denoising_features_surface(kg, state, &sd, render_buffer); #endif } @@ -604,22 +638,23 @@ ccl_device bool integrate_surface(KernelGlobals kg, } template<uint node_feature_mask = KERNEL_FEATURE_NODE_MASK_SURFACE & ~KERNEL_FEATURE_NODE_RAYTRACE, - int current_kernel = DEVICE_KERNEL_INTEGRATOR_SHADE_SURFACE> + DeviceKernel current_kernel = DEVICE_KERNEL_INTEGRATOR_SHADE_SURFACE> ccl_device_forceinline void integrator_shade_surface(KernelGlobals kg, IntegratorState state, ccl_global float *ccl_restrict render_buffer) { if (integrate_surface<node_feature_mask>(kg, state, render_buffer)) { if (INTEGRATOR_STATE(state, path, flag) & PATH_RAY_SUBSURFACE) { - INTEGRATOR_PATH_NEXT(current_kernel, DEVICE_KERNEL_INTEGRATOR_INTERSECT_SUBSURFACE); + integrator_path_next( + kg, state, current_kernel, DEVICE_KERNEL_INTEGRATOR_INTERSECT_SUBSURFACE); } else { - kernel_assert(INTEGRATOR_STATE(state, ray, t) != 0.0f); - INTEGRATOR_PATH_NEXT(current_kernel, DEVICE_KERNEL_INTEGRATOR_INTERSECT_CLOSEST); + kernel_assert(INTEGRATOR_STATE(state, ray, tmax) != 0.0f); + integrator_path_next(kg, state, current_kernel, DEVICE_KERNEL_INTEGRATOR_INTERSECT_CLOSEST); } } else { - INTEGRATOR_PATH_TERMINATE(current_kernel); + integrator_path_terminate(kg, state, current_kernel); } } |