Edit

Required Features for Multiple Render Targets

  • Article

A DirectX 9.0 version driver that supports rendering to multiple targets simultaneously must support the following features:

  • All surfaces for a given multiple render target group are allocated atomically. This limitation is addressed by treating this as a new type of surface format with multiple RGBA channels interleaved.

  • Only 32-bit surface formats are supported (for example, RGBA8, RGBA10, U16V16, and R32f type formats). This limitation is expressed by the name of the new surface formats.

  • A multiple render target group cannot be the primary (that is, the surface that is displayed). The multiple render target group must be off-screen only. This limitation is expressed by the surface format enumeration.

  • A multiple render target group cannot be a mipmap. That is, the creation of a MIP chain fails.

  • An element of a multiple render target group cannot be set as a texture at the same time as being a render target. However different elements of the group surface can simultaneously be textures and render targets.

  • No antialiasing of a multiple render target group is supported.

  • An element of a multiple render target group when used as a texture cannot be filtered. That is, no sampler state can affect the lookup.

  • An element of a multiple render target group cannot be locked.

  • Multiple elements of a multiple render target group can be used simultaneously, by assigning each element to various stages like typical textures.

  • Elements of a multiple render target group support gamma 2.2-1.0 conversion on read, just like other texture formats.

  • The D3DDP2OP_CLEAR operation code clears all elements of a multiple render target group.