public static SpvInstruction ApplyUnscaling( CodeGenContext context, AstTextureOperation texOp, SpvInstruction size, bool isBindless, bool isIndexed) { if (context.Config.Stage.SupportsRenderScale() && !isBindless && !isIndexed) { int index = context.Config.FindTextureDescriptorIndex(texOp); var pointerType = context.TypePointer(StorageClass.Uniform, context.TypeFP32()); var fieldIndex = context.Constant(context.TypeU32(), 4); var scaleIndex = context.Constant(context.TypeU32(), index); if (context.Config.Stage == ShaderStage.Vertex) { var scaleCountPointerType = context.TypePointer(StorageClass.Uniform, context.TypeS32()); var scaleCountElemPointer = context.AccessChain(scaleCountPointerType, context.SupportBuffer, context.Constant(context.TypeU32(), 3)); var scaleCount = context.Load(context.TypeS32(), scaleCountElemPointer); scaleIndex = context.IAdd(context.TypeU32(), scaleIndex, scaleCount); } scaleIndex = context.IAdd(context.TypeU32(), scaleIndex, context.Constant(context.TypeU32(), 1)); var scaleElemPointer = context.AccessChain(pointerType, context.SupportBuffer, fieldIndex, scaleIndex); var scale = context.GlslFAbs(context.TypeFP32(), context.Load(context.TypeFP32(), scaleElemPointer)); var passthrough = context.FOrdEqual(context.TypeBool(), scale, context.Constant(context.TypeFP32(), 1f)); var sizeFloat = context.ConvertSToF(context.TypeFP32(), size); var sizeUnscaled = context.FDiv(context.TypeFP32(), sizeFloat, scale); var sizeUnscaledInt = context.ConvertFToS(context.TypeS32(), sizeUnscaled); return(context.Select(context.TypeS32(), passthrough, size, sizeUnscaledInt)); } return(size); }