Expose srcOffset and length of bufferSubData in VertexBuffer.data #184
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Use case: I'm writing a sprite batcher which fills a CPU vertex buffer every time a new sprite is drawn.
When the buffer is "full" or when there are no more sprite to draw, it will upload everything into a VBO and render.
To make partially filled buffer uploads more efficient, it is necessary to specify the length.
srcOffsetis a "might as well" add since it is part ofbufferSubData.