diff options
Diffstat (limited to 'intern/cycles/kernel/kernel_light.h')
| -rw-r--r-- | intern/cycles/kernel/kernel_light.h | 406 |
1 files changed, 289 insertions, 117 deletions
diff --git a/intern/cycles/kernel/kernel_light.h b/intern/cycles/kernel/kernel_light.h index 42a834d2ce3..52f641634b9 100644 --- a/intern/cycles/kernel/kernel_light.h +++ b/intern/cycles/kernel/kernel_light.h @@ -14,7 +14,14 @@ * limitations under the License. */ +#pragma once + +#include "geom/geom.h" + #include "kernel_light_background.h" +#include "kernel_montecarlo.h" +#include "kernel_projection.h" +#include "kernel_types.h" CCL_NAMESPACE_BEGIN @@ -37,10 +44,22 @@ typedef struct LightSample { /* Regular Light */ -ccl_device_inline bool lamp_light_sample( - KernelGlobals *kg, int lamp, float randu, float randv, float3 P, LightSample *ls) +template<bool in_volume_segment> +ccl_device_inline bool light_sample(const KernelGlobals *kg, + const int lamp, + const float randu, + const float randv, + const float3 P, + const int path_flag, + LightSample *ls) { const ccl_global KernelLight *klight = &kernel_tex_fetch(__lights, lamp); + if (path_flag & PATH_RAY_SHADOW_CATCHER_PASS) { + if (klight->shader_id & SHADER_EXCLUDE_SHADOW_CATCHER) { + return false; + } + } + LightType type = (LightType)klight->type; ls->type = type; ls->shader = klight->shader_id; @@ -50,6 +69,18 @@ ccl_device_inline bool lamp_light_sample( ls->u = randu; ls->v = randv; + if (in_volume_segment && (type == LIGHT_DISTANT || type == LIGHT_BACKGROUND)) { + /* Distant lights in a volume get a dummy sample, position will not actually + * be used in that case. Only when sampling from a specific scatter position + * do we actually need to evaluate these. */ + ls->P = zero_float3(); + ls->Ng = zero_float3(); + ls->D = zero_float3(); + ls->pdf = true; + ls->t = FLT_MAX; + return true; + } + if (type == LIGHT_DISTANT) { /* distant light */ float3 lightD = make_float3(klight->co[0], klight->co[1], klight->co[2]); @@ -123,13 +154,15 @@ ccl_device_inline bool lamp_light_sample( float invarea = fabsf(klight->area.invarea); bool is_round = (klight->area.invarea < 0.0f); - if (dot(ls->P - P, Ng) > 0.0f) { - return false; + if (!in_volume_segment) { + if (dot(ls->P - P, Ng) > 0.0f) { + return false; + } } float3 inplane; - if (is_round) { + if (is_round || in_volume_segment) { inplane = ellipse_sample(axisu * 0.5f, axisv * 0.5f, randu, randv); ls->P += inplane; ls->pdf = invarea; @@ -176,79 +209,180 @@ ccl_device_inline bool lamp_light_sample( return (ls->pdf > 0.0f); } -ccl_device bool lamp_light_eval( - KernelGlobals *kg, int lamp, float3 P, float3 D, float t, LightSample *ls) +ccl_device bool lights_intersect(const KernelGlobals *ccl_restrict kg, + const Ray *ccl_restrict ray, + Intersection *ccl_restrict isect, + const int last_prim, + const int last_object, + const int last_type, + const int path_flag) { - const ccl_global KernelLight *klight = &kernel_tex_fetch(__lights, lamp); - LightType type = (LightType)klight->type; - ls->type = type; - ls->shader = klight->shader_id; - ls->object = PRIM_NONE; - ls->prim = PRIM_NONE; - ls->lamp = lamp; - /* todo: missing texture coordinates */ - ls->u = 0.0f; - ls->v = 0.0f; + for (int lamp = 0; lamp < kernel_data.integrator.num_all_lights; lamp++) { + const ccl_global KernelLight *klight = &kernel_tex_fetch(__lights, lamp); - if (!(ls->shader & SHADER_USE_MIS)) - return false; + if (path_flag & PATH_RAY_CAMERA) { + if (klight->shader_id & SHADER_EXCLUDE_CAMERA) { + continue; + } + } + else { + if (!(klight->shader_id & SHADER_USE_MIS)) { + continue; + } + } - if (type == LIGHT_DISTANT) { - /* distant light */ - float radius = klight->distant.radius; + if (path_flag & PATH_RAY_SHADOW_CATCHER_PASS) { + if (klight->shader_id & SHADER_EXCLUDE_SHADOW_CATCHER) { + continue; + } + } - if (radius == 0.0f) - return false; - if (t != FLT_MAX) - return false; + LightType type = (LightType)klight->type; + float t = 0.0f, u = 0.0f, v = 0.0f; - /* a distant light is infinitely far away, but equivalent to a disk - * shaped light exactly 1 unit away from the current shading point. - * - * radius t^2/cos(theta) - * <----------> t = sqrt(1^2 + tan(theta)^2) - * tan(th) area = radius*radius*pi - * <-----> - * \ | (1 + tan(theta)^2)/cos(theta) - * \ | (1 + tan(acos(cos(theta)))^2)/cos(theta) - * t \th| 1 simplifies to - * \-| 1/(cos(theta)^3) - * \| magic! - * P - */ + if (type == LIGHT_POINT || type == LIGHT_SPOT) { + /* Sphere light. */ + const float3 lightP = make_float3(klight->co[0], klight->co[1], klight->co[2]); + const float radius = klight->spot.radius; + if (radius == 0.0f) { + continue; + } - float3 lightD = make_float3(klight->co[0], klight->co[1], klight->co[2]); - float costheta = dot(-lightD, D); - float cosangle = klight->distant.cosangle; + float3 P; + if (!ray_aligned_disk_intersect(ray->P, ray->D, ray->t, lightP, radius, &P, &t)) { + continue; + } + } + else if (type == LIGHT_AREA) { + /* Area light. */ + const float invarea = fabsf(klight->area.invarea); + const bool is_round = (klight->area.invarea < 0.0f); + if (invarea == 0.0f) { + continue; + } - if (costheta < cosangle) - return false; + const float3 axisu = make_float3( + klight->area.axisu[0], klight->area.axisu[1], klight->area.axisu[2]); + const float3 axisv = make_float3( + klight->area.axisv[0], klight->area.axisv[1], klight->area.axisv[2]); + const float3 Ng = make_float3(klight->area.dir[0], klight->area.dir[1], klight->area.dir[2]); - ls->P = -D; - ls->Ng = -D; - ls->D = D; - ls->t = FLT_MAX; + /* One sided. */ + if (dot(ray->D, Ng) >= 0.0f) { + continue; + } - /* compute pdf */ - float invarea = klight->distant.invarea; - ls->pdf = invarea / (costheta * costheta * costheta); - ls->eval_fac = ls->pdf; + const float3 light_P = make_float3(klight->co[0], klight->co[1], klight->co[2]); + + float3 P; + if (!ray_quad_intersect( + ray->P, ray->D, 0.0f, ray->t, light_P, axisu, axisv, Ng, &P, &t, &u, &v, is_round)) { + continue; + } + } + else { + continue; + } + + if (t < isect->t && + !(last_prim == lamp && last_object == OBJECT_NONE && last_type == PRIMITIVE_LAMP)) { + isect->t = t; + isect->u = u; + isect->v = v; + isect->type = PRIMITIVE_LAMP; + isect->prim = lamp; + isect->object = OBJECT_NONE; + } + } + + return isect->prim != PRIM_NONE; +} + +ccl_device bool light_sample_from_distant_ray(const KernelGlobals *ccl_restrict kg, + const float3 ray_D, + const int lamp, + LightSample *ccl_restrict ls) +{ + const ccl_global KernelLight *klight = &kernel_tex_fetch(__lights, lamp); + const int shader = klight->shader_id; + const float radius = klight->distant.radius; + const LightType type = (LightType)klight->type; + + if (type != LIGHT_DISTANT) { + return false; + } + if (!(shader & SHADER_USE_MIS)) { + return false; + } + if (radius == 0.0f) { + return false; } - else if (type == LIGHT_POINT || type == LIGHT_SPOT) { - float3 lightP = make_float3(klight->co[0], klight->co[1], klight->co[2]); - float radius = klight->spot.radius; + /* a distant light is infinitely far away, but equivalent to a disk + * shaped light exactly 1 unit away from the current shading point. + * + * radius t^2/cos(theta) + * <----------> t = sqrt(1^2 + tan(theta)^2) + * tan(th) area = radius*radius*pi + * <-----> + * \ | (1 + tan(theta)^2)/cos(theta) + * \ | (1 + tan(acos(cos(theta)))^2)/cos(theta) + * t \th| 1 simplifies to + * \-| 1/(cos(theta)^3) + * \| magic! + * P + */ + + float3 lightD = make_float3(klight->co[0], klight->co[1], klight->co[2]); + float costheta = dot(-lightD, ray_D); + float cosangle = klight->distant.cosangle; + + if (costheta < cosangle) + return false; - /* sphere light */ - if (radius == 0.0f) - return false; + ls->type = type; + ls->shader = klight->shader_id; + ls->object = PRIM_NONE; + ls->prim = PRIM_NONE; + ls->lamp = lamp; + /* todo: missing texture coordinates */ + ls->u = 0.0f; + ls->v = 0.0f; + ls->t = FLT_MAX; + ls->P = -ray_D; + ls->Ng = -ray_D; + ls->D = ray_D; + + /* compute pdf */ + float invarea = klight->distant.invarea; + ls->pdf = invarea / (costheta * costheta * costheta); + ls->pdf *= kernel_data.integrator.pdf_lights; + ls->eval_fac = ls->pdf; - if (!ray_aligned_disk_intersect(P, D, t, lightP, radius, &ls->P, &ls->t)) { - return false; - } + return true; +} - ls->Ng = -D; - ls->D = D; +ccl_device bool light_sample_from_intersection(const KernelGlobals *ccl_restrict kg, + const Intersection *ccl_restrict isect, + const float3 ray_P, + const float3 ray_D, + LightSample *ccl_restrict ls) +{ + const int lamp = isect->prim; + const ccl_global KernelLight *klight = &kernel_tex_fetch(__lights, lamp); + LightType type = (LightType)klight->type; + ls->type = type; + ls->shader = klight->shader_id; + ls->object = PRIM_NONE; + ls->prim = PRIM_NONE; + ls->lamp = lamp; + /* todo: missing texture coordinates */ + ls->t = isect->t; + ls->P = ray_P + ray_D * ls->t; + ls->D = ray_D; + + if (type == LIGHT_POINT || type == LIGHT_SPOT) { + ls->Ng = -ray_D; float invarea = klight->spot.invarea; ls->eval_fac = (0.25f * M_1_PI_F) * invarea; @@ -260,8 +394,9 @@ ccl_device bool lamp_light_eval( ls->eval_fac *= spot_light_attenuation( dir, klight->spot.spot_angle, klight->spot.spot_smooth, ls->Ng); - if (ls->eval_fac == 0.0f) + if (ls->eval_fac == 0.0f) { return false; + } } float2 uv = map_to_sphere(ls->Ng); ls->u = uv.x; @@ -274,31 +409,22 @@ ccl_device bool lamp_light_eval( else if (type == LIGHT_AREA) { /* area light */ float invarea = fabsf(klight->area.invarea); - bool is_round = (klight->area.invarea < 0.0f); - if (invarea == 0.0f) - return false; float3 axisu = make_float3( klight->area.axisu[0], klight->area.axisu[1], klight->area.axisu[2]); float3 axisv = make_float3( klight->area.axisv[0], klight->area.axisv[1], klight->area.axisv[2]); float3 Ng = make_float3(klight->area.dir[0], klight->area.dir[1], klight->area.dir[2]); - - /* one sided */ - if (dot(D, Ng) >= 0.0f) - return false; - float3 light_P = make_float3(klight->co[0], klight->co[1], klight->co[2]); - if (!ray_quad_intersect( - P, D, 0.0f, t, light_P, axisu, axisv, Ng, &ls->P, &ls->t, &ls->u, &ls->v, is_round)) { - return false; - } - - ls->D = D; + ls->u = isect->u; + ls->v = isect->v; + ls->D = ray_D; ls->Ng = Ng; + + const bool is_round = (klight->area.invarea < 0.0f); if (is_round) { - ls->pdf = invarea * lamp_light_pdf(kg, Ng, -D, ls->t); + ls->pdf = invarea * lamp_light_pdf(kg, Ng, -ray_D, ls->t); } else { float3 sample_axisu = axisu; @@ -306,12 +432,12 @@ ccl_device bool lamp_light_eval( if (klight->area.tan_spread > 0.0f) { if (!light_spread_clamp_area_light( - P, Ng, &light_P, &sample_axisu, &sample_axisv, klight->area.tan_spread)) { + ray_P, Ng, &light_P, &sample_axisu, &sample_axisv, klight->area.tan_spread)) { return false; } } - ls->pdf = rect_light_sample(P, &light_P, sample_axisu, sample_axisv, 0, 0, false); + ls->pdf = rect_light_sample(ray_P, &light_P, sample_axisu, sample_axisv, 0, 0, false); } ls->eval_fac = 0.25f * invarea; @@ -325,6 +451,7 @@ ccl_device bool lamp_light_eval( } } else { + kernel_assert(!"Invalid lamp type in light_sample_from_intersection"); return false; } @@ -337,7 +464,7 @@ ccl_device bool lamp_light_eval( /* returns true if the triangle is has motion blur or an instancing transform applied */ ccl_device_inline bool triangle_world_space_vertices( - KernelGlobals *kg, int object, int prim, float time, float3 V[3]) + const KernelGlobals *kg, int object, int prim, float time, float3 V[3]) { bool has_motion = false; const int object_flag = kernel_tex_fetch(__object_flag, object); @@ -365,7 +492,7 @@ ccl_device_inline bool triangle_world_space_vertices( return has_motion; } -ccl_device_inline float triangle_light_pdf_area(KernelGlobals *kg, +ccl_device_inline float triangle_light_pdf_area(const KernelGlobals *kg, const float3 Ng, const float3 I, float t) @@ -379,7 +506,9 @@ ccl_device_inline float triangle_light_pdf_area(KernelGlobals *kg, return t * t * pdf / cos_pi; } -ccl_device_forceinline float triangle_light_pdf(KernelGlobals *kg, ShaderData *sd, float t) +ccl_device_forceinline float triangle_light_pdf(const KernelGlobals *kg, + const ShaderData *sd, + float t) { /* A naive heuristic to decide between costly solid angle sampling * and simple area sampling, comparing the distance to the triangle plane @@ -448,7 +577,8 @@ ccl_device_forceinline float triangle_light_pdf(KernelGlobals *kg, ShaderData *s } } -ccl_device_forceinline void triangle_light_sample(KernelGlobals *kg, +template<bool in_volume_segment> +ccl_device_forceinline void triangle_light_sample(const KernelGlobals *kg, int prim, int object, float randu, @@ -488,7 +618,7 @@ ccl_device_forceinline void triangle_light_sample(KernelGlobals *kg, float distance_to_plane = fabsf(dot(N0, V[0] - P) / dot(N0, N0)); - if (longest_edge_squared > distance_to_plane * distance_to_plane) { + if (!in_volume_segment && (longest_edge_squared > distance_to_plane * distance_to_plane)) { /* see James Arvo, "Stratified Sampling of Spherical Triangles" * http://www.graphics.cornell.edu/pubs/1995/Arv95c.pdf */ @@ -617,7 +747,7 @@ ccl_device_forceinline void triangle_light_sample(KernelGlobals *kg, /* Light Distribution */ -ccl_device int light_distribution_sample(KernelGlobals *kg, float *randu) +ccl_device int light_distribution_sample(const KernelGlobals *kg, float *randu) { /* This is basically std::upper_bound as used by PBRT, to find a point light or * triangle to emit from, proportional to area. a good improvement would be to @@ -655,51 +785,93 @@ ccl_device int light_distribution_sample(KernelGlobals *kg, float *randu) /* Generic Light */ -ccl_device_inline bool light_select_reached_max_bounces(KernelGlobals *kg, int index, int bounce) +ccl_device_inline bool light_select_reached_max_bounces(const KernelGlobals *kg, + int index, + int bounce) { return (bounce > kernel_tex_fetch(__lights, index).max_bounces); } -ccl_device_noinline bool light_sample(KernelGlobals *kg, - int lamp, - float randu, - float randv, - float time, - float3 P, - int bounce, - LightSample *ls) +template<bool in_volume_segment> +ccl_device_noinline bool light_distribution_sample(const KernelGlobals *kg, + float randu, + const float randv, + const float time, + const float3 P, + const int bounce, + const int path_flag, + LightSample *ls) { - if (lamp < 0) { - /* sample index */ - int index = light_distribution_sample(kg, &randu); - - /* fetch light data */ - const ccl_global KernelLightDistribution *kdistribution = &kernel_tex_fetch( - __light_distribution, index); - int prim = kdistribution->prim; - - if (prim >= 0) { - int object = kdistribution->mesh_light.object_id; - int shader_flag = kdistribution->mesh_light.shader_flag; - - triangle_light_sample(kg, prim, object, randu, randv, time, ls, P); - ls->shader |= shader_flag; - return (ls->pdf > 0.0f); + /* Sample light index from distribution. */ + const int index = light_distribution_sample(kg, &randu); + const ccl_global KernelLightDistribution *kdistribution = &kernel_tex_fetch(__light_distribution, + index); + const int prim = kdistribution->prim; + + if (prim >= 0) { + /* Mesh light. */ + const int object = kdistribution->mesh_light.object_id; + + /* Exclude synthetic meshes from shadow catcher pass. */ + if ((path_flag & PATH_RAY_SHADOW_CATCHER_PASS) && + !(kernel_tex_fetch(__object_flag, object) & SD_OBJECT_SHADOW_CATCHER)) { + return false; } - lamp = -prim - 1; + const int shader_flag = kdistribution->mesh_light.shader_flag; + triangle_light_sample<in_volume_segment>(kg, prim, object, randu, randv, time, ls, P); + ls->shader |= shader_flag; + return (ls->pdf > 0.0f); } + const int lamp = -prim - 1; + if (UNLIKELY(light_select_reached_max_bounces(kg, lamp, bounce))) { return false; } - return lamp_light_sample(kg, lamp, randu, randv, P, ls); + return light_sample<in_volume_segment>(kg, lamp, randu, randv, P, path_flag, ls); +} + +ccl_device_inline bool light_distribution_sample_from_volume_segment(const KernelGlobals *kg, + float randu, + const float randv, + const float time, + const float3 P, + const int bounce, + const int path_flag, + LightSample *ls) +{ + return light_distribution_sample<true>(kg, randu, randv, time, P, bounce, path_flag, ls); +} + +ccl_device_inline bool light_distribution_sample_from_position(const KernelGlobals *kg, + float randu, + const float randv, + const float time, + const float3 P, + const int bounce, + const int path_flag, + LightSample *ls) +{ + return light_distribution_sample<false>(kg, randu, randv, time, P, bounce, path_flag, ls); } -ccl_device_inline int light_select_num_samples(KernelGlobals *kg, int index) +ccl_device_inline bool light_distribution_sample_new_position(const KernelGlobals *kg, + const float randu, + const float randv, + const float time, + const float3 P, + LightSample *ls) { - return kernel_tex_fetch(__lights, index).samples; + /* Sample a new position on the same light, for volume sampling. */ + if (ls->type == LIGHT_TRIANGLE) { + triangle_light_sample<false>(kg, ls->prim, ls->object, randu, randv, time, ls, P); + return (ls->pdf > 0.0f); + } + else { + return light_sample<false>(kg, ls->lamp, randu, randv, P, 0, ls); + } } CCL_NAMESPACE_END |