internal BufferObject(BufferTarget target, BufferUsageHint hint)
{
Id = GManager.GenBuffer();
Target = target;
UsageHint = hint;
Size = -1;
}
public SpriteInstanceBuffer()
{
VAO = GManager.GenVertexArray();
GL.BindVertexArray(VAO);
float[] vertexData = new float[]
{
-0.5f, -0.5f,
0.5f, -0.5f,
-0.5f, 0.5f,
0.5f, 0.5f
};
int floatSize = sizeof(float);
// Setup buffers
VertexBuffer = GManager.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, VertexBuffer);
GL.BufferData(BufferTarget.ArrayBuffer, vertexData.Length * floatSize, vertexData, BufferUsageHint.StaticDraw);
GL.VertexAttribPointer(0, 2, VertexAttribPointerType.Float, false, 0, IntPtr.Zero);
PositionBuffer = GManager.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, PositionBuffer);
GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(MaxSprites * 2 * floatSize), IntPtr.Zero, BufferUsageHint.StreamDraw);
GL.VertexAttribPointer(1, 2, VertexAttribPointerType.Float, false, 0, IntPtr.Zero);
ColorBuffer = GManager.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, ColorBuffer);
GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(MaxSprites * 4 * sizeof(byte)), IntPtr.Zero, BufferUsageHint.StreamDraw);
GL.VertexAttribPointer(2, 4, VertexAttribPointerType.UnsignedByte, true, 0, IntPtr.Zero);
OrientationBuffer = GManager.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, OrientationBuffer);
GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(MaxSprites * 3 * floatSize), IntPtr.Zero, BufferUsageHint.StreamDraw);
GL.VertexAttribPointer(3, 3, VertexAttribPointerType.Float, false, 0, IntPtr.Zero);
GL.BindVertexArray(0);
}