#include "CpuMesh.hpp"

#include <cstring>

StandardCpuMesh::StandardCpuMesh()
	: mGpuMesh(new GpuMesh()) {
	mGpuMesh->vertFormat = gVformatStandard;
	mGpuMesh->vertBufBindings.SetBinding(0, new GpuVertexBuffer());
	mGpuMesh->vertBufBindings.SetBinding(1, new GpuVertexBuffer());
	mGpuMesh->indexBuf.Attach(new GpuIndexBuffer());
}

StandardCpuMesh::~StandardCpuMesh() {
	delete mData;
}

void StandardCpuMesh::CreateCpuData() {
	if (!mData) {
		mData = new StandardCpuMeshData();
	}
}

GpuVertexBuffer* StandardCpuMesh::GetPosBuffer() const {
	return mGpuMesh->vertBufBindings.bindings[0].Get();
}

GpuVertexBuffer* StandardCpuMesh::GetExtraBuffer() const {
	return mGpuMesh->vertBufBindings.bindings[1].Get();
}

bool StandardCpuMesh::UpdatePositions(glm::vec3* pos, size_t count, size_t startVertIndex) {
	if (mData) {
		std::memcpy(&mData->vertPositions[startVertIndex], pos, count * sizeof(glm::vec3));
	}
	auto posBuf = GetPosBuffer();
	glBindBuffer(GL_ARRAY_BUFFER, posBuf->handle);
	glBufferSubData(GL_ARRAY_BUFFER, startVertIndex * mGpuMesh->vertFormat->vertexSize, count * sizeof(glm::vec3), pos);
	return true;
}

bool StandardCpuMesh::UpdateColors(RgbaColor* color, size_t count, size_t starVertIndex) {
	if (!mData) return false;
	// TODO
}

bool StandardCpuMesh::UpdateNormals(glm::vec2* normals, size_t count, size_t startVertIndex) {
	if (!mData) return false;
	// TODO
}

bool StandardCpuMesh::UpdateIndices(uint32_t* indices, size_t count, size_t startVertIndex) {
	if (!mData) return false;
	// TODO
}