Example #1
0
        private static void ApplyScalingNoInterpolation(CodeGenContext context, SpvInstruction output, SpvInstruction vector, SpvInstruction scale)
        {
            if (context.Config.Stage == ShaderStage.Vertex)
            {
                scale = context.GlslFAbs(context.TypeFP32(), scale);
            }

            var vector2Type = context.TypeVector(context.TypeFP32(), 2);

            var vectorFloat  = context.ConvertSToF(vector2Type, vector);
            var vectorScaled = context.VectorTimesScalar(vector2Type, vectorFloat, scale);

            context.Store(output, context.ConvertFToS(context.TypeVector(context.TypeS32(), 2), vectorScaled));
        }
Example #2
0
        private static void ApplyScalingInterpolated(CodeGenContext context, SpvInstruction output, SpvInstruction vector, SpvInstruction scale)
        {
            var vector2Type = context.TypeVector(context.TypeFP32(), 2);

            var scaleNegated = context.FNegate(context.TypeFP32(), scale);
            var scaleVector  = context.CompositeConstruct(vector2Type, scaleNegated, scaleNegated);

            var vectorFloat  = context.ConvertSToF(vector2Type, vector);
            var vectorScaled = context.VectorTimesScalar(vector2Type, vectorFloat, scaleNegated);

            var fragCoordPointer = context.Inputs[AttributeConsts.PositionX];
            var fragCoord        = context.Load(context.TypeVector(context.TypeFP32(), 4), fragCoordPointer);
            var fragCoordXY      = context.VectorShuffle(vector2Type, fragCoord, fragCoord, 0, 1);

            var scaleMod           = context.FMod(vector2Type, fragCoordXY, scaleVector);
            var vectorInterpolated = context.FAdd(vector2Type, vectorScaled, scaleMod);

            context.Store(output, context.ConvertFToS(context.TypeVector(context.TypeS32(), 2), vectorInterpolated));
        }
Example #3
0
        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);
        }