135 lines
4.5 KiB
C++
135 lines
4.5 KiB
C++
/*
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* Copyright (C) 2018 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 "Sphere.h"
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#include <filament/Engine.h>
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#include <filament/IndexBuffer.h>
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#include <filament/RenderableManager.h>
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#include <filament/TransformManager.h>
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#include <filament/VertexBuffer.h>
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#include <utils/EntityManager.h>
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#include <math/norm.h>
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#include "IcoSphere.h"
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using namespace filament;
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using namespace math;
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using namespace utils;
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struct Geometry {
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IcoSphere sphere = IcoSphere{ 2 };
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std::vector<math::short4> tangents;
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filament::VertexBuffer* vertexBuffer = nullptr;
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filament::IndexBuffer* indexBuffer = nullptr;
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};
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// note: this will be leaked since we don't have a good time to free it.
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// this should be a cache indexed on the sphere's subdivisions
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static Geometry* gGeometry = nullptr;
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Sphere::Sphere(Engine& engine, Material const* material, bool culling)
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: mEngine(engine) {
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Geometry* geometry = gGeometry;
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static_assert(sizeof(IcoSphere::Triangle) == sizeof(IcoSphere::Index) * 3,
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"indices are not packed");
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if (geometry == nullptr) {
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geometry = gGeometry = new Geometry;
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auto const& indices = geometry->sphere.getIndices();
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auto const& vertices = geometry->sphere.getVertices();
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uint32_t indexCount = (uint32_t)(indices.size() * 3);
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geometry->tangents.resize(vertices.size());
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VertexBuffer::populateTangentQuaternions(VertexBuffer::QuatTangentContext {
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.quatType = VertexBuffer::SHORT4,
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.quatCount = vertices.size(),
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.outBuffer = geometry->tangents.data(),
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.outStride = sizeof(math::short4),
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.normals = vertices.data()
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});
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// todo produce correct u,v
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geometry->vertexBuffer = VertexBuffer::Builder()
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.vertexCount((uint32_t)vertices.size())
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.bufferCount(2)
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.attribute(VertexAttribute::POSITION, 0, VertexBuffer::AttributeType::FLOAT3)
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.attribute(VertexAttribute::TANGENTS, 1, VertexBuffer::AttributeType::SHORT4)
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.normalized(VertexAttribute::TANGENTS)
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.build(engine);
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geometry->vertexBuffer->setBufferAt(engine, 0,
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VertexBuffer::BufferDescriptor(vertices.data(), vertices.size() * sizeof(float3)));
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geometry->vertexBuffer->setBufferAt(engine, 1,
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VertexBuffer::BufferDescriptor(geometry->tangents.data(), geometry->tangents.size() * sizeof(math::short4)));
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geometry->indexBuffer = IndexBuffer::Builder()
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.bufferType(IndexBuffer::IndexType::USHORT)
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.indexCount(indexCount)
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.build(engine);
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geometry->indexBuffer->setBuffer(engine,
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IndexBuffer::BufferDescriptor(indices.data(), indexCount * sizeof(IcoSphere::Index)));
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}
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if (material) {
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mMaterialInstance = material->createInstance();
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}
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utils::EntityManager& em = utils::EntityManager::get();
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mRenderable = em.create();
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RenderableManager::Builder(1)
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.boundingBox({{0}, {1}})
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.material(0, mMaterialInstance)
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.geometry(0, RenderableManager::PrimitiveType::TRIANGLES, geometry->vertexBuffer, geometry->indexBuffer)
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.culling(culling)
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.build(engine, mRenderable);
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}
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Sphere::~Sphere() {
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mEngine.destroy(mMaterialInstance);
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mEngine.destroy(mRenderable);
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utils::EntityManager& em = utils::EntityManager::get();
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em.destroy(mRenderable);
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}
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Sphere& Sphere::setPosition(math::float3 const& position) noexcept {
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auto& tcm = mEngine.getTransformManager();
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auto ci = tcm.getInstance(mRenderable);
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mat4f model = tcm.getTransform(ci);
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model[3].xyz = position;
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tcm.setTransform(ci, model);
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return *this;
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}
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Sphere& Sphere::setRadius(float radius) noexcept {
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auto& tcm = mEngine.getTransformManager();
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auto ci = tcm.getInstance(mRenderable);
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mat4f model = tcm.getTransform(ci);
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model[0].x = radius;
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model[1].y = radius;
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model[2].z = radius;
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tcm.setTransform(ci, model);
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return *this;
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}
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