Viewport::enum

Members 

Description 

View_IsRenderTexture = 1 

 

View_AlphaComposite = 2 

Support blending into the destination through a render target texture. Only blend/ alpha and add modes are supported. Render the texture with source blend factor 1, destination blend factor 1-sa. 

View_UseScissorRect = 4 

 

View_NoSetState = 8 

Don't set viewport/ scissor state on device. Currently only supported by some renderer implementations. 

View_NoHWViewMatrix = 0x10 

If this flag is set, render HAL will not multiply apply the HW view matrix during rendering; instead it will expect users to apply it themselves by first calling GetHWViewMatrix. 

View_Orientation_Normal 

Defines orientation of the viewport coordinate system within the buffer.This means that BufferWidth/Height remain the same for both orientations, but Top, Left, Width, Height (and scissor coordinates) change. So, to rotate 480x960 view to landscape, would specify:
{ BufferWidth,Height = 480,960; Left,Top = 0,0; Width,Height = 960,480, Flags = View_Orientation_R90 } 

View_Orientation_R90 

 

View_Orientation_180 

 

View_Orientation_L90 

 

View_Orientation_Mask 

 

View_RenderTextureAlpha = View_IsRenderTexture | View_AlphaComposite 

 

View_FirstHalFlag = 0x100 

Hal-specific flags should start here. 

View_Stereo_AnySplit = 0xc0 

For stereo in display hardware only; uses the same size buffer but half for each eye. 

View_Stereo_SplitH = 0x80 

For stereo in display hardware only; uses the same size buffer but half for each eye. 

View_Stereo_SplitV = 0x40 

For stereo in display hardware only; uses the same size buffer but half for each eye. 

View_HalfPixelOffset = 0x100 

The viewport should offset by a half-pixel to be on the pixel centers. 

View_NoClear = 0x200 

The viewport should not invoke a clear operation. Useful if a customer knows that his or her content will have a fully opaque backdrop of some sort and wants to avoid an extra 100% overdraw.