InstancedMeshRenderComponent.cpp

#include "InstancedMeshRenderComponent.h"
 
#include "Types.h"
 
using namespace Cogs::Reflection;
 
void Cogs::Core::InstancedMeshRenderComponent::registerType()
{
  Field fields[] = {
    { "instanceMesh", &InstancedMeshRenderComponent::instanceMesh },
    { "material", &InstancedMeshRenderComponent::material },
    { "startIndex", &InstancedMeshRenderComponent::startIndex },
    { "vertexCount", &InstancedMeshRenderComponent::vertexCount },
    { "startInstance", &InstancedMeshRenderComponent::startInstance },
    { "instanceCount", &InstancedMeshRenderComponent::instanceCount },
    { "primitiveType", &InstancedMeshRenderComponent::primitiveType },
    { "instanceIdMultiplier", &InstancedMeshRenderComponent::instanceIdMultiplier },
  };
 
  TypeDatabase::createType<InstancedMeshRenderComponent>().setBase<RenderComponent>().setFields(fields);
}
 
uint32_t Cogs::Core::InstancedMeshRenderComponent::getRenderCount(uint32_t startIndex, uint32_t instanceCount, uint32_t meshCount)
{
  if (startIndex >= meshCount) {
    return 0u;
  }
 
  const uint32_t count = instanceCount != DrawRest ? instanceCount : meshCount - startIndex;
 
  // Wrap-around not legal.
  if (count > DrawRest - startIndex) {
    return 0u;
  }
 
  // Limit to available mesh values.
  return (startIndex + count > meshCount) ? (meshCount - startIndex) : count;
}