So I am finally fixing up my renderer to work in linear space after not caring (enough) about it for many years, and I wanted to do a sanity check on my plan to make sure I am doing it correctly. Up to this point I have had pretty much everything in DXGI_FORMAT_R8G8B8A8_UNORM, including textures (diffuse), swap chains and any offscreen buffers. My plan is roughly the following:
- Load diffuse textures as DXGI_FORMAT_R8G8B8A8_UNORM_SRGB. Normal maps and other non-color textures should still be non-sRGB as far as I know.
- Create the swap chain back buffers in the DXGI_FORMAT_R8G8B8A8_UNORM_SRGB format.
- Render the scene (both the main render pass + all other color render passes) into offscreen buffers in DXGI_FORMAT_R8G8B8A8_UNORM format. My plan is to have one main texture which acts as the "back buffer" during the rendering process. It is there simply to have a linear-space buffer to work with.
- After all rendering is finished, I will copy the linear space "back buffer" to the actual back buffer of the swap chain.
Does that sound right? Also, will the graphics API allow me to copy the linear buffer to the back buffer with a normal texture-to-texture copy or do I need to handle the linear-to-gamma change somehow? I have heard that the APIs handle the conversion when rendering to an sRGB buffer (ie. output from a PS) but is the same performed when copying from a linear texture to an sRGB texture? My targeted APIs are currently DX11, DX12 and Vulkan.
Cheers!
↧