public SpriteBatcher(int poolSize, Shader shader)
{
_poolSize = poolSize;
_bufferSize = _poolSize * 4; // 4 vertices per sprite
_indexSize = _poolSize * 6; // 6 elements per sprite
_items = new List<SpriteBatchItem>(_poolSize);
_itemPool = new Queue<SpriteBatchItem>(_poolSize);
_vertices = new Vertex[_bufferSize];
_bufferHandle = GlHelper.CreateBuffer(_vertices, BufferTarget.ArrayBuffer, BufferUsageHint.StreamDraw);
_indices = new ushort[_indexSize];
// generate a massive index array for quads (2 triangles)
for (var i = 0; i < _poolSize; i++)
{
_indices[i * 6 + 0] = (ushort)(i * 4);
_indices[i * 6 + 1] = (ushort)(i * 4 + 1);
_indices[i * 6 + 2] = (ushort)(i * 4 + 2);
_indices[i * 6 + 3] = (ushort)(i * 4 + 2);
_indices[i * 6 + 4] = (ushort)(i * 4 + 1);
_indices[i * 6 + 5] = (ushort)(i * 4 + 3);
}
_indexHandle = GlHelper.CreateBuffer(_indices, BufferTarget.ElementArrayBuffer, BufferUsageHint.DynamicDraw);
var attributes = shader.GetAttributes(_bufferHandle);
_vertexHandle = GlHelper.CreateVertexArray(attributes);
}
public SpriteBatch(int poolSize, Shader shader)
{
PoolSize = poolSize;
_shader = shader;
_batcher = new SpriteBatcher(PoolSize, shader);
}