Seele/src/Engine/Scene/Scene.cpp

#include "Scene.h"
#include "Graphics/Graphics.h"
#include "Graphics/Mesh.h"
#include "Component/StaticMesh.h"
#include "Component/Transform.h"

using namespace Seele;

inline float frand()
{
    return (float)rand()/RAND_MAX;
}

Scene::Scene(Gfx::PGraphics graphics)
    : graphics(graphics)
    , physics(registry)
{
}

Scene::~Scene()
{
}

void Scene::update(float deltaTime)
{
    physics.update(deltaTime);
}

Array<StaticMeshBatch> Scene::getStaticMeshes()
{
    Array<StaticMeshBatch> result;
    auto view = registry.view<Component::StaticMesh, Component::Transform>();
    uint32 sceneDataIndex = 0;
    sceneData.clear();
    for(auto&& [entity, mesh, transform] : view.each())
    {
        sceneData.add(PrimitiveSceneData {
            .localToWorld = transform.toMatrix(),
            .worldToLocal = glm::inverse(transform.toMatrix()),
            .actorLocation = Vector4(transform.getPosition(), 1.0f)
        });
        for(auto& m : mesh.mesh->meshes)
        {
            auto& batch = result.add();
            batch.material = m->referencedMaterial;
            batch.isBackfaceCullingDisabled = false;
            batch.isCastingShadow = true;
            batch.topology = Gfx::SE_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
            batch.useReverseCulling = false;
            batch.useWireframe = false;
            batch.vertexInput = m->vertexInput;
            MeshBatchElement batchElement;
            batchElement.baseVertexIndex = 0;
            batchElement.firstIndex = 0;
            batchElement.indexBuffer = m->indexBuffer;
            batchElement.indirectArgsBuffer = nullptr;
            batchElement.isInstanced = false;
            batchElement.numInstances = 1;
            batchElement.sceneDataIndex = sceneDataIndex;
            batch.elements.add(batchElement);
        }
        sceneDataIndex++;
    }
    if(sceneDataBuffer == nullptr || sceneDataBuffer->getNumElements() != sceneData.size())
    {
        StructuredBufferCreateInfo createInfo = StructuredBufferCreateInfo {
            .resourceData = {
                .size = sceneData.size() * sizeof(PrimitiveSceneData),
                .data = nullptr,
            },
            .stride = (uint32)sceneData.size(),
        };
        sceneDataBuffer = graphics->createStructuredBuffer(createInfo);
    }
    sceneDataBuffer->updateContents(BulkResourceData {
        .size = sceneData.size() * sizeof(PrimitiveSceneData),
        .data = (uint8*)sceneData.data(),
    });
    return result;
}

LightEnv Scene::getLightBuffer() const 
{
    LightEnv result;
    result.directionalLights[0].color = Vector4(0.4, 0.3, 0.5, 1.0);
    result.directionalLights[0].direction = Vector4(0.5, 0.5, 0, 0);
    result.directionalLights[0].intensity = Vector4(1.0, 0.9, 0.7, 0.5);\
    result.numDirectionalLights = 1;
    result.numPointLights = 0;
    return result;
}