diff options
Diffstat (limited to 'intern/cycles/kernel/integrator/shade_volume.h')
| -rw-r--r-- | intern/cycles/kernel/integrator/shade_volume.h | 125 |
1 files changed, 64 insertions, 61 deletions
diff --git a/intern/cycles/kernel/integrator/shade_volume.h b/intern/cycles/kernel/integrator/shade_volume.h index 4aab097a7d8..0d35011c359 100644 --- a/intern/cycles/kernel/integrator/shade_volume.h +++ b/intern/cycles/kernel/integrator/shade_volume.h @@ -29,13 +29,13 @@ typedef enum VolumeIntegrateEvent { typedef struct VolumeIntegrateResult { /* Throughput and offset for direct light scattering. */ bool direct_scatter; - float3 direct_throughput; + Spectrum direct_throughput; float direct_t; ShaderVolumePhases direct_phases; /* Throughput and offset for indirect light scattering. */ bool indirect_scatter; - float3 indirect_throughput; + Spectrum indirect_throughput; float indirect_t; ShaderVolumePhases indirect_phases; } VolumeIntegrateResult; @@ -52,16 +52,16 @@ typedef struct VolumeIntegrateResult { * sigma_t = sigma_a + sigma_s */ typedef struct VolumeShaderCoefficients { - float3 sigma_t; - float3 sigma_s; - float3 emission; + Spectrum sigma_t; + Spectrum sigma_s; + Spectrum emission; } VolumeShaderCoefficients; /* Evaluate shader to get extinction coefficient at P. */ ccl_device_inline bool shadow_volume_shader_sample(KernelGlobals kg, IntegratorShadowState state, ccl_private ShaderData *ccl_restrict sd, - ccl_private float3 *ccl_restrict extinction) + ccl_private Spectrum *ccl_restrict extinction) { VOLUME_READ_LAMBDA(integrator_state_read_shadow_volume_stack(state, i)) shader_eval_volume<true>(kg, state, sd, PATH_RAY_SHADOW, volume_read_lambda_pass); @@ -89,9 +89,10 @@ ccl_device_inline bool volume_shader_sample(KernelGlobals kg, return false; } - coeff->sigma_s = zero_float3(); - coeff->sigma_t = (sd->flag & SD_EXTINCTION) ? sd->closure_transparent_extinction : zero_float3(); - coeff->emission = (sd->flag & SD_EMISSION) ? sd->closure_emission_background : zero_float3(); + coeff->sigma_s = zero_spectrum(); + coeff->sigma_t = (sd->flag & SD_EXTINCTION) ? sd->closure_transparent_extinction : + zero_spectrum(); + coeff->emission = (sd->flag & SD_EMISSION) ? sd->closure_emission_background : zero_spectrum(); if (sd->flag & SD_SCATTER) { for (int i = 0; i < sd->num_closure; i++) { @@ -162,9 +163,9 @@ ccl_device_forceinline void volume_step_init(KernelGlobals kg, ccl_device void volume_shadow_homogeneous(KernelGlobals kg, IntegratorState state, ccl_private Ray *ccl_restrict ray, ccl_private ShaderData *ccl_restrict sd, - ccl_global float3 *ccl_restrict throughput) + ccl_global Spectrum *ccl_restrict throughput) { - float3 sigma_t = zero_float3(); + Spectrum sigma_t = zero_spectrum(); if (shadow_volume_shader_sample(kg, state, sd, &sigma_t)) { *throughput *= volume_color_transmittance(sigma_t, ray->tmax - ray->tmin); @@ -178,14 +179,14 @@ ccl_device void volume_shadow_heterogeneous(KernelGlobals kg, IntegratorShadowState state, ccl_private Ray *ccl_restrict ray, ccl_private ShaderData *ccl_restrict sd, - ccl_private float3 *ccl_restrict throughput, + ccl_private Spectrum *ccl_restrict throughput, const float object_step_size) { /* Load random number state. */ RNGState rng_state; shadow_path_state_rng_load(state, &rng_state); - float3 tp = *throughput; + Spectrum tp = *throughput; /* Prepare for stepping. * For shadows we do not offset all segments, since the starting point is @@ -207,7 +208,7 @@ ccl_device void volume_shadow_heterogeneous(KernelGlobals kg, /* compute extinction at the start */ float t = ray->tmin; - float3 sum = zero_float3(); + Spectrum sum = zero_spectrum(); for (int i = 0; i < max_steps; i++) { /* advance to new position */ @@ -215,7 +216,7 @@ ccl_device void volume_shadow_heterogeneous(KernelGlobals kg, float dt = new_t - t; float3 new_P = ray->P + ray->D * (t + dt * step_shade_offset); - float3 sigma_t = zero_float3(); + Spectrum sigma_t = zero_spectrum(); /* compute attenuation over segment */ sd->P = new_P; @@ -228,8 +229,7 @@ ccl_device void volume_shadow_heterogeneous(KernelGlobals kg, tp = *throughput * exp(sum); /* stop if nearly all light is blocked */ - if (tp.x < VOLUME_THROUGHPUT_EPSILON && tp.y < VOLUME_THROUGHPUT_EPSILON && - tp.z < VOLUME_THROUGHPUT_EPSILON) + if (reduce_max(tp) < VOLUME_THROUGHPUT_EPSILON) break; } } @@ -334,22 +334,22 @@ ccl_device float volume_equiangular_cdf(ccl_private const Ray *ccl_restrict ray, /* Distance sampling */ ccl_device float volume_distance_sample(float max_t, - float3 sigma_t, + Spectrum sigma_t, int channel, float xi, - ccl_private float3 *transmittance, - ccl_private float3 *pdf) + ccl_private Spectrum *transmittance, + ccl_private Spectrum *pdf) { /* xi is [0, 1[ so log(0) should never happen, division by zero is * avoided because sample_sigma_t > 0 when SD_SCATTER is set */ float sample_sigma_t = volume_channel_get(sigma_t, channel); - float3 full_transmittance = volume_color_transmittance(sigma_t, max_t); + Spectrum full_transmittance = volume_color_transmittance(sigma_t, max_t); float sample_transmittance = volume_channel_get(full_transmittance, channel); float sample_t = min(max_t, -logf(1.0f - xi * (1.0f - sample_transmittance)) / sample_sigma_t); *transmittance = volume_color_transmittance(sigma_t, sample_t); - *pdf = safe_divide_color(sigma_t * *transmittance, one_float3() - full_transmittance); + *pdf = safe_divide_color(sigma_t * *transmittance, one_spectrum() - full_transmittance); /* todo: optimization: when taken together with hit/miss decision, * the full_transmittance cancels out drops out and xi does not @@ -358,33 +358,36 @@ ccl_device float volume_distance_sample(float max_t, return sample_t; } -ccl_device float3 volume_distance_pdf(float max_t, float3 sigma_t, float sample_t) +ccl_device Spectrum volume_distance_pdf(float max_t, Spectrum sigma_t, float sample_t) { - float3 full_transmittance = volume_color_transmittance(sigma_t, max_t); - float3 transmittance = volume_color_transmittance(sigma_t, sample_t); + Spectrum full_transmittance = volume_color_transmittance(sigma_t, max_t); + Spectrum transmittance = volume_color_transmittance(sigma_t, sample_t); - return safe_divide_color(sigma_t * transmittance, one_float3() - full_transmittance); + return safe_divide_color(sigma_t * transmittance, one_spectrum() - full_transmittance); } /* Emission */ -ccl_device float3 volume_emission_integrate(ccl_private VolumeShaderCoefficients *coeff, - int closure_flag, - float3 transmittance, - float t) +ccl_device Spectrum volume_emission_integrate(ccl_private VolumeShaderCoefficients *coeff, + int closure_flag, + Spectrum transmittance, + float t) { /* integral E * exp(-sigma_t * t) from 0 to t = E * (1 - exp(-sigma_t * t))/sigma_t * this goes to E * t as sigma_t goes to zero * * todo: we should use an epsilon to avoid precision issues near zero sigma_t */ - float3 emission = coeff->emission; + Spectrum emission = coeff->emission; if (closure_flag & SD_EXTINCTION) { - float3 sigma_t = coeff->sigma_t; + Spectrum sigma_t = coeff->sigma_t; - emission.x *= (sigma_t.x > 0.0f) ? (1.0f - transmittance.x) / sigma_t.x : t; - emission.y *= (sigma_t.y > 0.0f) ? (1.0f - transmittance.y) / sigma_t.y : t; - emission.z *= (sigma_t.z > 0.0f) ? (1.0f - transmittance.z) / sigma_t.z : t; + FOREACH_SPECTRUM_CHANNEL (i) { + GET_SPECTRUM_CHANNEL(emission, i) *= (GET_SPECTRUM_CHANNEL(sigma_t, i) > 0.0f) ? + (1.0f - GET_SPECTRUM_CHANNEL(transmittance, i)) / + GET_SPECTRUM_CHANNEL(sigma_t, i) : + t; + } } else emission *= t; @@ -419,14 +422,14 @@ ccl_device_forceinline void volume_integrate_step_scattering( ccl_private const Ray *ray, const float3 equiangular_light_P, ccl_private const VolumeShaderCoefficients &ccl_restrict coeff, - const float3 transmittance, + const Spectrum transmittance, ccl_private VolumeIntegrateState &ccl_restrict vstate, ccl_private VolumeIntegrateResult &ccl_restrict result) { /* Pick random color channel, we use the Veach one-sample * model with balance heuristic for the channels. */ - const float3 albedo = safe_divide_color(coeff.sigma_s, coeff.sigma_t); - float3 channel_pdf; + const Spectrum albedo = safe_divide_color(coeff.sigma_s, coeff.sigma_t); + Spectrum channel_pdf; const int channel = volume_sample_channel( albedo, result.indirect_throughput, vstate.rphase, &channel_pdf); @@ -435,7 +438,7 @@ ccl_device_forceinline void volume_integrate_step_scattering( if (result.direct_t >= vstate.tmin && result.direct_t <= vstate.tmax && vstate.equiangular_pdf > VOLUME_SAMPLE_PDF_CUTOFF) { const float new_dt = result.direct_t - vstate.tmin; - const float3 new_transmittance = volume_color_transmittance(coeff.sigma_t, new_dt); + const Spectrum new_transmittance = volume_color_transmittance(coeff.sigma_t, new_dt); result.direct_scatter = true; result.direct_throughput *= coeff.sigma_s * new_transmittance / vstate.equiangular_pdf; @@ -467,7 +470,7 @@ ccl_device_forceinline void volume_integrate_step_scattering( const float new_t = vstate.tmin + new_dt; /* transmittance and pdf */ - const float3 new_transmittance = volume_color_transmittance(coeff.sigma_t, new_dt); + const Spectrum new_transmittance = volume_color_transmittance(coeff.sigma_t, new_dt); const float distance_pdf = dot(channel_pdf, coeff.sigma_t * new_transmittance); if (vstate.distance_pdf * distance_pdf > VOLUME_SAMPLE_PDF_CUTOFF) { @@ -566,7 +569,7 @@ ccl_device_forceinline void volume_integrate_heterogeneous( vstate.distance_pdf = 1.0f; /* Initialize volume integration result. */ - const float3 throughput = INTEGRATOR_STATE(state, path, throughput); + const Spectrum throughput = INTEGRATOR_STATE(state, path, throughput); result.direct_throughput = throughput; result.indirect_throughput = throughput; @@ -579,9 +582,9 @@ ccl_device_forceinline void volume_integrate_heterogeneous( # ifdef __DENOISING_FEATURES__ const bool write_denoising_features = (INTEGRATOR_STATE(state, path, flag) & PATH_RAY_DENOISING_FEATURES); - float3 accum_albedo = zero_float3(); + Spectrum accum_albedo = zero_spectrum(); # endif - float3 accum_emission = zero_float3(); + Spectrum accum_emission = zero_spectrum(); for (int i = 0; i < max_steps; i++) { /* Advance to new position */ @@ -596,16 +599,16 @@ ccl_device_forceinline void volume_integrate_heterogeneous( /* Evaluate transmittance over segment. */ const float dt = (vstate.tmax - vstate.tmin); - const float3 transmittance = (closure_flag & SD_EXTINCTION) ? - volume_color_transmittance(coeff.sigma_t, dt) : - one_float3(); + const Spectrum transmittance = (closure_flag & SD_EXTINCTION) ? + volume_color_transmittance(coeff.sigma_t, dt) : + one_spectrum(); /* Emission. */ if (closure_flag & SD_EMISSION) { /* Only write emission before indirect light scatter position, since we terminate * stepping at that point if we have already found a direct light scatter position. */ if (!result.indirect_scatter) { - const float3 emission = volume_emission_integrate( + const Spectrum emission = volume_emission_integrate( &coeff, closure_flag, transmittance, dt); accum_emission += result.indirect_throughput * emission; } @@ -616,8 +619,8 @@ ccl_device_forceinline void volume_integrate_heterogeneous( # ifdef __DENOISING_FEATURES__ /* Accumulate albedo for denoising features. */ if (write_denoising_features && (closure_flag & SD_SCATTER)) { - const float3 albedo = safe_divide_color(coeff.sigma_s, coeff.sigma_t); - accum_albedo += result.indirect_throughput * albedo * (one_float3() - transmittance); + const Spectrum albedo = safe_divide_color(coeff.sigma_s, coeff.sigma_t); + accum_albedo += result.indirect_throughput * albedo * (one_spectrum() - transmittance); } # endif @@ -634,7 +637,7 @@ ccl_device_forceinline void volume_integrate_heterogeneous( /* Stop if nearly all light blocked. */ if (!result.indirect_scatter) { if (reduce_max(result.indirect_throughput) < VOLUME_THROUGHPUT_EPSILON) { - result.indirect_throughput = zero_float3(); + result.indirect_throughput = zero_spectrum(); break; } } @@ -715,7 +718,7 @@ ccl_device_forceinline void integrate_volume_direct_light( ccl_private const RNGState *ccl_restrict rng_state, const float3 P, ccl_private const ShaderVolumePhases *ccl_restrict phases, - ccl_private const float3 throughput, + ccl_private const Spectrum throughput, ccl_private LightSample *ccl_restrict ls) { PROFILING_INIT(kg, PROFILING_SHADE_VOLUME_DIRECT_LIGHT); @@ -753,7 +756,7 @@ ccl_device_forceinline void integrate_volume_direct_light( * non-constant light sources. */ ShaderDataTinyStorage emission_sd_storage; ccl_private ShaderData *emission_sd = AS_SHADER_DATA(&emission_sd_storage); - 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; } @@ -796,11 +799,11 @@ ccl_device_forceinline void integrate_volume_direct_light( const uint16_t transparent_bounce = INTEGRATOR_STATE(state, path, transparent_bounce); uint32_t shadow_flag = INTEGRATOR_STATE(state, path, flag); shadow_flag |= (is_light) ? PATH_RAY_SHADOW_FOR_LIGHT : 0; - const float3 throughput_phase = throughput * bsdf_eval_sum(&phase_eval); + const Spectrum throughput_phase = throughput * bsdf_eval_sum(&phase_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. */ @@ -810,8 +813,8 @@ ccl_device_forceinline void integrate_volume_direct_light( else { /* Direct light, no diffuse/glossy distinction needed for volumes. */ shadow_flag |= PATH_RAY_VOLUME_PASS; - pass_diffuse_weight = packed_float3(one_float3()); - pass_glossy_weight = packed_float3(zero_float3()); + pass_diffuse_weight = one_spectrum(); + pass_glossy_weight = zero_spectrum(); } INTEGRATOR_STATE_WRITE(shadow_state, shadow_path, pass_diffuse_weight) = pass_diffuse_weight; @@ -898,13 +901,13 @@ ccl_device_forceinline bool integrate_volume_phase_scatter( INTEGRATOR_STATE_WRITE(state, isect, object) = sd->object; /* Update throughput. */ - const float3 throughput = INTEGRATOR_STATE(state, path, throughput); - const float3 throughput_phase = throughput * bsdf_eval_sum(&phase_eval) / phase_pdf; + const Spectrum throughput = INTEGRATOR_STATE(state, path, throughput); + const Spectrum throughput_phase = throughput * bsdf_eval_sum(&phase_eval) / phase_pdf; INTEGRATOR_STATE_WRITE(state, path, throughput) = throughput_phase; if (kernel_data.kernel_features & KERNEL_FEATURE_LIGHT_PASSES) { - INTEGRATOR_STATE_WRITE(state, path, pass_diffuse_weight) = one_float3(); - INTEGRATOR_STATE_WRITE(state, path, pass_glossy_weight) = zero_float3(); + INTEGRATOR_STATE_WRITE(state, path, pass_diffuse_weight) = one_spectrum(); + INTEGRATOR_STATE_WRITE(state, path, pass_glossy_weight) = zero_spectrum(); } /* Update path state */ |