D3D12: Fixed alpharef.
D3D12: Fixed alpharef.

0-wiz-0/bgfx,emoon/bgfx,fluffyfreak/bgfx,andr3wmac/bgfx,0-wiz-0/bgfx,0-wiz-0/bgfx,andr3wmac/bgfx,mmicko/bgfx,BlueCrystalLabs/bgfx,jpcy/bgfx,aonorin/bgfx,elmindreda/bgfx,v3n/bgfx,mendsley/bgfx,v3n/bgfx,LSBOSS/bgfx,septag/bgfx,v3n/bgfx,darkimage/bgfx,sergeScherbakov/bgfx,BlueCrystalLabs/bgfx,septag/bgfx,mmicko/bgfx,mcanthony/bgfx,ktotheoz/bgfx,kondrak/bgfx,elmindreda/bgfx,marco-we/bgfx,marco-we/bgfx,mendsley/bgfx,Extrawurst/bgfx,aonorin/bgfx,andr3wmac/bgfx,jpcy/bgfx,jpcy/bgfx,cuavas/bgfx,fluffyfreak/bgfx,bkaradzic/bgfx,jdryg/bgfx,fluffyfreak/bgfx,kondrak/bgfx,cuavas/bgfx,LSBOSS/bgfx,Extrawurst/bgfx,jdryg/bgfx,Synxis/bgfx,attilaz/bgfx,LWJGL-CI/bgfx,LSBOSS/bgfx,MikePopoloski/bgfx,mmicko/bgfx,darkimage/bgfx,emoon/bgfx,marco-we/bgfx,Synxis/bgfx,bkaradzic/bgfx,bkaradzic/bgfx,Extrawurst/bgfx,kondrak/bgfx,darkimage/bgfx,aonorin/bgfx,ktotheoz/bgfx,Synxis/bgfx,mendsley/bgfx,fluffyfreak/bgfx,BlueCrystalLabs/bgfx,attilaz/bgfx,sergeScherbakov/bgfx,MikePopoloski/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,attilaz/bgfx,LWJGL-CI/bgfx,cuavas/bgfx,sergeScherbakov/bgfx,mcanthony/bgfx,MikePopoloski/bgfx,elmindreda/bgfx,LWJGL-CI/bgfx,jpcy/bgfx,ktotheoz/bgfx,septag/bgfx,emoon/bgfx,jdryg/bgfx,mcanthony/bgfx,jdryg/bgfx