2cade209b5
We add the concept of the descriptor set as a way to describe shader resources into Filament. This is a comprehensive change across Filament. Info on descriptor sets is available here: https://docs.vulkan.org/spec/latest/chapters/descriptorsets.html Co-authored-by: Benjamin Doherty <bendoherty@google.com> Co-authored-by: Mathias Agopian <mathias@google.com> Co-authored-by: Sungun Park <sungunpark@google.com>
126 lines
4.2 KiB
C++
126 lines
4.2 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 "private/filament/SamplerInterfaceBlock.h"
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#include <backend/DriverEnums.h>
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#include <utils/Panic.h>
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#include <initializer_list>
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#include <iterator>
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#include <string_view>
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#include <utility>
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#include <stddef.h>
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#include <stdint.h>
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using namespace utils;
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namespace filament {
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SamplerInterfaceBlock::Builder::Builder() = default;
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SamplerInterfaceBlock::Builder::~Builder() noexcept = default;
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SamplerInterfaceBlock::Builder&
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SamplerInterfaceBlock::Builder::name(std::string_view interfaceBlockName) {
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mName = { interfaceBlockName.data(), interfaceBlockName.size() };
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return *this;
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}
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SamplerInterfaceBlock::Builder&
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SamplerInterfaceBlock::Builder::stageFlags(backend::ShaderStageFlags stageFlags) {
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mStageFlags = stageFlags;
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return *this;
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}
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SamplerInterfaceBlock::Builder& SamplerInterfaceBlock::Builder::add(
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std::string_view samplerName, Binding binding, Type type, Format format,
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Precision precision, bool multisample) noexcept {
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mEntries.push_back({
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{ samplerName.data(), samplerName.size() }, // name
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{ }, // uniform name
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binding, type, format, precision, multisample });
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return *this;
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}
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SamplerInterfaceBlock SamplerInterfaceBlock::Builder::build() {
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return SamplerInterfaceBlock(*this);
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}
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SamplerInterfaceBlock::Builder& SamplerInterfaceBlock::Builder::add(
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std::initializer_list<ListEntry> list) noexcept {
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for (auto& e : list) {
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add(e.name, e.binding, e.type, e.format, e.precision, e.multisample);
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}
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return *this;
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}
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// -------------------------------------------------------------------------------------------------
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SamplerInterfaceBlock::SamplerInterfaceBlock() = default;
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SamplerInterfaceBlock::SamplerInterfaceBlock(SamplerInterfaceBlock&& rhs) noexcept = default;
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SamplerInterfaceBlock& SamplerInterfaceBlock::operator=(SamplerInterfaceBlock&& rhs) noexcept = default;
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SamplerInterfaceBlock::~SamplerInterfaceBlock() noexcept = default;
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SamplerInterfaceBlock::SamplerInterfaceBlock(Builder const& builder) noexcept
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: mName(builder.mName), mStageFlags(builder.mStageFlags),
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mSamplersInfoList(builder.mEntries.size())
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{
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auto& infoMap = mInfoMap;
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infoMap.reserve(builder.mEntries.size());
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auto& samplersInfoList = mSamplersInfoList;
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for (auto const& e : builder.mEntries) {
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size_t const i = std::distance(builder.mEntries.data(), &e);
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SamplerInfo& info = samplersInfoList[i];
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info = e;
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info.uniformName = generateUniformName(mName.c_str(), e.name.c_str());
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infoMap[{ info.name.data(), info.name.size() }] = i; // info.name.c_str() guaranteed constant
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}
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}
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const SamplerInterfaceBlock::SamplerInfo* SamplerInterfaceBlock::getSamplerInfo(
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std::string_view name) const {
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auto pos = mInfoMap.find(name);
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FILAMENT_CHECK_PRECONDITION(pos != mInfoMap.end()) << "sampler named \"" << name << "\" not found";
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return &mSamplersInfoList[pos->second];
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}
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utils::CString SamplerInterfaceBlock::generateUniformName(const char* group, const char* sampler) noexcept {
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char uniformName[256];
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// sampler interface block name
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char* const prefix = std::copy_n(group,
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std::min(sizeof(uniformName) / 2, strlen(group)), uniformName);
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if (uniformName[0] >= 'A' && uniformName[0] <= 'Z') {
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uniformName[0] |= 0x20; // poor man's tolower()
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}
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*prefix = '_';
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char* last = std::copy_n(sampler,
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std::min(sizeof(uniformName) / 2 - 2, strlen(sampler)),
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prefix + 1);
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*last++ = 0; // null terminator
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assert(last <= std::end(uniformName));
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return CString{ uniformName, size_t(last - uniformName) - 1u };
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}
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} // namespace filament
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