protected void Init(IntPtr dataPointer)
{
#if SILICONSTUDIO_PARADOX_GRAPHICS_API_OPENGLES
if (GraphicsDevice.IsOpenGLES2 &&
((Description.BufferFlags & BufferFlags.ConstantBuffer) == BufferFlags.ConstantBuffer ||
Description.Usage == GraphicsResourceUsage.Dynamic))
{
if (dataPointer != IntPtr.Zero)
{
// Special case: ConstantBuffer are faked with a byte array on OpenGL ES 2.0.
unsafe
{
Utilities.CopyMemory(StagingData, dataPointer, Description.SizeInBytes);
}
}
return;
}
#endif
switch (Description.Usage)
{
case GraphicsResourceUsage.Default:
case GraphicsResourceUsage.Immutable:
bufferUsageHint = BufferUsageHint.StaticDraw;
break;
case GraphicsResourceUsage.Dynamic:
case GraphicsResourceUsage.Staging:
bufferUsageHint = BufferUsageHint.DynamicDraw;
break;
default:
throw new ArgumentOutOfRangeException("description.Usage");
}
using (var creationContext = GraphicsDevice.UseOpenGLCreationContext())
{
// If we're on main context, unbind VAO before binding context.
// It will be bound again on next draw.
if (!creationContext.UseDeviceCreationContext)
{
GraphicsDevice.UnbindVertexArrayObject();
}
GL.GenBuffers(1, out resourceId);
GL.BindBuffer(bufferTarget, resourceId);
GL.BufferData(bufferTarget, (IntPtr)Description.SizeInBytes, dataPointer, bufferUsageHint);
GL.BindBuffer(bufferTarget, 0);
}
}