2/2 WineD3D: initial post pixelshader blending support

[Roderick Colenbrander]

Hi,

Store a flag whether a format supports blending in the formats table. This patch uses the flag in the blending code and in a few other places to verify if we should turn on blending for the given format. A next patch will also us e this flag for a CheckPixelShaderBlendingCapability call for CheckDeviceFormat. Later on I plan to move more of the Check*Capability functions over to the table.

This patch seems to help float formats like R32F a lot in a simple R32F demo I got a 5-6x speed boost (using this patch in combination with no R32F software conversion and no filtering).

Regards,
Roderick Colenbrander
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