Brecht Van Lommel
fd77a28031
These transparent shadows can be expansive to evaluate. Especially on the GPU they can lead to poor occupancy when only some pixels require many kernel launches to trace and evaluate many layers of transparency. Baked transparency allows tracing a single ray in many cases by accumulating the throughput directly in the intersection program without recording hits or evaluating shaders. Transparency is baked at curve vertices and interpolated, for most shaders this will look practically the same as actual shader evaluation. Fixes T91428, performance regression with spring demo file due to transparent hair, and makes it render significantly faster than Blender 2.93. Differential Revision: https://developer.blender.org/D12880
121 lines
3.9 KiB
C++
121 lines
3.9 KiB
C++
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "kernel/kernel_differential.h"
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#include "kernel/kernel_projection.h"
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#include "kernel/kernel_shader.h"
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#include "kernel/geom/geom.h"
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CCL_NAMESPACE_BEGIN
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ccl_device void kernel_displace_evaluate(KernelGlobals kg,
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ccl_global const KernelShaderEvalInput *input,
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ccl_global float *output,
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const int offset)
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{
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/* Setup shader data. */
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const KernelShaderEvalInput in = input[offset];
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ShaderData sd;
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shader_setup_from_displace(kg, &sd, in.object, in.prim, in.u, in.v);
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/* Evaluate displacement shader. */
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const float3 P = sd.P;
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shader_eval_displacement(kg, INTEGRATOR_STATE_NULL, &sd);
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float3 D = sd.P - P;
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object_inverse_dir_transform(kg, &sd, &D);
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#ifdef __KERNEL_DEBUG_NAN__
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if (!isfinite3_safe(D)) {
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kernel_assert(!"Cycles displacement with non-finite value detected");
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}
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#endif
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/* Ensure finite displacement, preventing BVH from becoming degenerate and avoiding possible
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* traversal issues caused by non-finite math. */
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D = ensure_finite3(D);
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/* Write output. */
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output[offset * 3 + 0] += D.x;
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output[offset * 3 + 1] += D.y;
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output[offset * 3 + 2] += D.z;
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}
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ccl_device void kernel_background_evaluate(KernelGlobals kg,
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ccl_global const KernelShaderEvalInput *input,
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ccl_global float *output,
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const int offset)
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{
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/* Setup ray */
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const KernelShaderEvalInput in = input[offset];
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const float3 ray_P = zero_float3();
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const float3 ray_D = equirectangular_to_direction(in.u, in.v);
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const float ray_time = 0.5f;
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/* Setup shader data. */
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ShaderData sd;
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shader_setup_from_background(kg, &sd, ray_P, ray_D, ray_time);
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/* Evaluate shader.
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* This is being evaluated for all BSDFs, so path flag does not contain a specific type. */
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const uint32_t path_flag = PATH_RAY_EMISSION;
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shader_eval_surface<KERNEL_FEATURE_NODE_MASK_SURFACE_LIGHT &
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~(KERNEL_FEATURE_NODE_RAYTRACE | KERNEL_FEATURE_NODE_LIGHT_PATH)>(
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kg, INTEGRATOR_STATE_NULL, &sd, NULL, path_flag);
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float3 color = shader_background_eval(&sd);
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#ifdef __KERNEL_DEBUG_NAN__
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if (!isfinite3_safe(color)) {
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kernel_assert(!"Cycles background with non-finite value detected");
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}
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#endif
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/* Ensure finite color, avoiding possible numerical instabilities in the path tracing kernels. */
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color = ensure_finite3(color);
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/* Write output. */
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output[offset * 3 + 0] += color.x;
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output[offset * 3 + 1] += color.y;
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output[offset * 3 + 2] += color.z;
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}
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ccl_device void kernel_curve_shadow_transparency_evaluate(
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KernelGlobals kg,
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ccl_global const KernelShaderEvalInput *input,
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ccl_global float *output,
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const int offset)
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{
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/* Setup shader data. */
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const KernelShaderEvalInput in = input[offset];
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ShaderData sd;
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shader_setup_from_curve(kg, &sd, in.object, in.prim, __float_as_int(in.v), in.u);
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/* Evaluate transparency. */
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shader_eval_surface<KERNEL_FEATURE_NODE_MASK_SURFACE_SHADOW &
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~(KERNEL_FEATURE_NODE_RAYTRACE | KERNEL_FEATURE_NODE_LIGHT_PATH)>(
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kg, INTEGRATOR_STATE_NULL, &sd, NULL, PATH_RAY_SHADOW);
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/* Write output. */
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output[offset] = clamp(average(shader_bsdf_transparency(kg, &sd)), 0.0f, 1.0f);
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}
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CCL_NAMESPACE_END
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