123 lines
5.6 KiB
C++
123 lines
5.6 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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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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#include "SibGenerator.h"
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#include "private/filament/Variant.h"
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#include "private/filament/EngineEnums.h"
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#include "private/filament/SamplerInterfaceBlock.h"
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#include "private/filament/SibStructs.h"
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namespace filament {
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SamplerInterfaceBlock const& SibGenerator::getPerViewSib(Variant variant) noexcept {
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using Type = SamplerInterfaceBlock::Type;
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using Format = SamplerInterfaceBlock::Format;
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using Precision = SamplerInterfaceBlock::Precision;
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// What is happening here is that depending on the variant, some samplers' type or format
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// can change (e.g.: when VSM is used the shadowmap sampler is a regular float sampler),
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// so we return a different SamplerInterfaceBlock based on the variant.
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//
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// The samplers' name and binding (i.e. ordering) must match in all SamplerInterfaceBlocks
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// because this information is stored per-material and not per-shader.
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//
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// For the SSR (reflections) SamplerInterfaceBlock, only two samplers are ever used, for this
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// reason we name them "unused*" to ensure we're not using them by mistake (type/format don't
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// matter). This will not affect SamplerBindingMap because it always uses the default variant,
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// and so the correct information will be stored in the material file.
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static SamplerInterfaceBlock const sibPcf{ SamplerInterfaceBlock::Builder()
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.name("Light")
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.stageFlags(backend::ShaderStageFlags::FRAGMENT)
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.add( {{ "shadowMap", Type::SAMPLER_2D_ARRAY, Format::SHADOW, Precision::MEDIUM },
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{ "froxels", Type::SAMPLER_2D, Format::UINT, Precision::MEDIUM },
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{ "iblDFG", Type::SAMPLER_2D, Format::FLOAT, Precision::MEDIUM },
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{ "iblSpecular", Type::SAMPLER_CUBEMAP, Format::FLOAT, Precision::MEDIUM },
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{ "ssao", Type::SAMPLER_2D_ARRAY, Format::FLOAT, Precision::MEDIUM },
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{ "ssr", Type::SAMPLER_2D_ARRAY, Format::FLOAT, Precision::MEDIUM },
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{ "structure", Type::SAMPLER_2D, Format::FLOAT, Precision::HIGH }}
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)
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.build() };
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static SamplerInterfaceBlock const sibVsm{ SamplerInterfaceBlock::Builder()
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.name("Light")
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.stageFlags(backend::ShaderStageFlags::FRAGMENT)
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.add( {{ "shadowMap", Type::SAMPLER_2D_ARRAY, Format::FLOAT, Precision::HIGH },
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{ "froxels", Type::SAMPLER_2D, Format::UINT, Precision::MEDIUM },
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{ "iblDFG", Type::SAMPLER_2D, Format::FLOAT, Precision::MEDIUM },
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{ "iblSpecular", Type::SAMPLER_CUBEMAP, Format::FLOAT, Precision::MEDIUM },
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{ "ssao", Type::SAMPLER_2D_ARRAY, Format::FLOAT, Precision::MEDIUM },
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{ "ssr", Type::SAMPLER_2D_ARRAY, Format::FLOAT, Precision::MEDIUM },
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{ "structure", Type::SAMPLER_2D, Format::FLOAT, Precision::HIGH }}
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)
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.build() };
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static SamplerInterfaceBlock const sibSsr{ SamplerInterfaceBlock::Builder()
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.name("Light")
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.stageFlags(backend::ShaderStageFlags::FRAGMENT)
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.add( {{ "unused0" },
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{ "unused1" },
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{ "unused2" },
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{ "unused3" },
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{ "unused4" },
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{ "ssr", Type::SAMPLER_2D, Format::FLOAT, Precision::MEDIUM },
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{ "structure", Type::SAMPLER_2D, Format::FLOAT, Precision::HIGH }}
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)
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.build() };
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assert_invariant(sibPcf.getSize() == PerViewSib::SAMPLER_COUNT);
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assert_invariant(sibVsm.getSize() == PerViewSib::SAMPLER_COUNT);
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assert_invariant(sibSsr.getSize() == PerViewSib::SAMPLER_COUNT);
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if (Variant::isSSRVariant(variant)) {
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return sibSsr;
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} else if (Variant::isVSMVariant(variant)) {
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return sibVsm;
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} else {
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return sibPcf;
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}
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}
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SamplerInterfaceBlock const& SibGenerator::getPerRenderPrimitiveMorphingSib(Variant) noexcept {
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using Type = SamplerInterfaceBlock::Type;
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using Format = SamplerInterfaceBlock::Format;
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using Precision = SamplerInterfaceBlock::Precision;
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static SamplerInterfaceBlock const sib = SamplerInterfaceBlock::Builder()
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.name("MorphTargetBuffer")
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.stageFlags(backend::ShaderStageFlags::VERTEX)
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.add({ { "positions", Type::SAMPLER_2D_ARRAY, Format::FLOAT, Precision::HIGH },
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{ "tangents", Type::SAMPLER_2D_ARRAY, Format::INT, Precision::HIGH }})
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.build();
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return sib;
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}
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SamplerInterfaceBlock const* SibGenerator::getSib(
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SamplerBindingPoints bindingPoint, Variant variant) noexcept {
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switch (bindingPoint) {
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case SamplerBindingPoints::PER_VIEW:
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return &getPerViewSib(variant);
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case SamplerBindingPoints::PER_RENDERABLE_MORPHING:
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return &getPerRenderPrimitiveMorphingSib(variant);
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default:
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return nullptr;
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}
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}
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} // namespace filament
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