Add area sampling scaler to allow for super-sampled anti-aliasing. (#7304)

* Add area sampling scaler to allow for super-sampled anti-aliasing.

* Area scaling filter doesn't have a scaling level.

* Add further clarification to the tooltip on how to achieve supersampling.

* ShaderHelper: Merge the two CompileProgram functions.

* Convert tabs to spaces in area scaling shaders

* Fixup Vulkan and OpenGL project files.

* AreaScaling: Replace texture() by texelFetch() and use integer vectors.

No functional difference, but it cleans up the code a bit.

* AreaScaling: Delete unused sharpening level member.

Also rename _scale to _sharpeningLevel for clarity and consistency.

* AreaScaling: Delete unused scaleX/scaleY uniforms.

* AreaScaling: Force the alpha to 1 when storing the pixel.

* AreaScaling: Remove left-over sharpening buffer.

1 files changed, 101 insertions, 0 deletions

diff --git a/src/Ryujinx.Graphics.Vulkan/Effects/AreaScalingFilter.cs b/src/Ryujinx.Graphics.Vulkan/Effects/AreaScalingFilter.cs
new file mode 100644
index 00000000..87b46df8
--- /dev/null
+++ b/src/Ryujinx.Graphics.Vulkan/Effects/AreaScalingFilter.cs
@@ -0,0 +1,101 @@
+using Ryujinx.Common;
+using Ryujinx.Graphics.GAL;
+using Ryujinx.Graphics.Shader;
+using Ryujinx.Graphics.Shader.Translation;
+using Silk.NET.Vulkan;
+using System;
+using Extent2D = Ryujinx.Graphics.GAL.Extents2D;
+using Format = Silk.NET.Vulkan.Format;
+using SamplerCreateInfo = Ryujinx.Graphics.GAL.SamplerCreateInfo;
+
+namespace Ryujinx.Graphics.Vulkan.Effects
+{
+    internal class AreaScalingFilter : IScalingFilter
+    {
+        private readonly VulkanRenderer _renderer;
+        private PipelineHelperShader _pipeline;
+        private ISampler _sampler;
+        private ShaderCollection _scalingProgram;
+        private Device _device;
+
+        public float Level { get; set; }
+
+        public AreaScalingFilter(VulkanRenderer renderer, Device device)
+        {
+            _device = device;
+            _renderer = renderer;
+
+            Initialize();
+        }
+
+        public void Dispose()
+        {
+            _pipeline.Dispose();
+            _scalingProgram.Dispose();
+            _sampler.Dispose();
+        }
+
+        public void Initialize()
+        {
+            _pipeline = new PipelineHelperShader(_renderer, _device);
+
+            _pipeline.Initialize();
+
+            var scalingShader = EmbeddedResources.Read("Ryujinx.Graphics.Vulkan/Effects/Shaders/AreaScaling.spv");
+
+            var scalingResourceLayout = new ResourceLayoutBuilder()
+                .Add(ResourceStages.Compute, ResourceType.UniformBuffer, 2)
+                .Add(ResourceStages.Compute, ResourceType.TextureAndSampler, 1)
+                .Add(ResourceStages.Compute, ResourceType.Image, 0, true).Build();
+
+            _sampler = _renderer.CreateSampler(SamplerCreateInfo.Create(MinFilter.Linear, MagFilter.Linear));
+
+            _scalingProgram = _renderer.CreateProgramWithMinimalLayout(new[]
+            {
+                new ShaderSource(scalingShader, ShaderStage.Compute, TargetLanguage.Spirv),
+            }, scalingResourceLayout);
+        }
+
+        public void Run(
+            TextureView view,
+            CommandBufferScoped cbs,
+            Auto<DisposableImageView> destinationTexture,
+            Format format,
+            int width,
+            int height,
+            Extent2D source,
+            Extent2D destination)
+        {
+            _pipeline.SetCommandBuffer(cbs);
+            _pipeline.SetProgram(_scalingProgram);
+            _pipeline.SetTextureAndSampler(ShaderStage.Compute, 1, view, _sampler);
+
+            ReadOnlySpan<float> dimensionsBuffer = stackalloc float[]
+            {
+                source.X1,
+                source.X2,
+                source.Y1,
+                source.Y2,
+                destination.X1,
+                destination.X2,
+                destination.Y1,
+                destination.Y2,
+            };
+
+            int rangeSize = dimensionsBuffer.Length * sizeof(float);
+            using var buffer = _renderer.BufferManager.ReserveOrCreate(_renderer, cbs, rangeSize);
+            buffer.Holder.SetDataUnchecked(buffer.Offset, dimensionsBuffer);
+
+            int threadGroupWorkRegionDim = 16;
+            int dispatchX = (width + (threadGroupWorkRegionDim - 1)) / threadGroupWorkRegionDim;
+            int dispatchY = (height + (threadGroupWorkRegionDim - 1)) / threadGroupWorkRegionDim;
+
+            _pipeline.SetUniformBuffers(stackalloc[] { new BufferAssignment(2, buffer.Range) });
+            _pipeline.SetImage(0, destinationTexture);
+            _pipeline.DispatchCompute(dispatchX, dispatchY, 1);
+            _pipeline.ComputeBarrier();
+
+            _pipeline.Finish();
+        }
+    }
+}