From 80b497213981512e9ba1a629bcd5e2c519d2e566 Mon Sep 17 00:00:00 2001
From: Emmanuel Hansen <emmausssss@gmail.com>
Date: Mon, 27 Feb 2023 21:11:55 +0000
Subject: Add Support for Post Processing Effects (#3616)

* Add Post Processing Effects

* fix events and shader issues

* fix gtk upscale slider value

* fix bgra games

* don't swap swizzle if already swapped

* restore opengl texture state after effects run

* addressed review

* use single pipeline for smaa and fsr

* call finish on all pipelines

* addressed review

* attempt fix file case

* attempt fixing file case

* fix filter level tick frequency

* adjust filter slider margins

* replace fxaa shaders with original shader

* addressed review
---
 .../Effects/FxaaPostProcessingEffect.cs            | 81 ++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 Ryujinx.Graphics.OpenGL/Effects/FxaaPostProcessingEffect.cs

(limited to 'Ryujinx.Graphics.OpenGL/Effects/FxaaPostProcessingEffect.cs')

diff --git a/Ryujinx.Graphics.OpenGL/Effects/FxaaPostProcessingEffect.cs b/Ryujinx.Graphics.OpenGL/Effects/FxaaPostProcessingEffect.cs
new file mode 100644
index 00000000..3a2d685b
--- /dev/null
+++ b/Ryujinx.Graphics.OpenGL/Effects/FxaaPostProcessingEffect.cs
@@ -0,0 +1,81 @@
+using OpenTK.Graphics.OpenGL;
+using Ryujinx.Common;
+using Ryujinx.Graphics.OpenGL.Image;
+
+namespace Ryujinx.Graphics.OpenGL.Effects
+{
+    internal class FxaaPostProcessingEffect : IPostProcessingEffect
+    {
+        private readonly OpenGLRenderer _renderer;
+        private int _resolutionUniform;
+        private int _inputUniform;
+        private int _outputUniform;
+        private int _shaderProgram;
+        private TextureStorage _textureStorage;
+
+        public FxaaPostProcessingEffect(OpenGLRenderer renderer)
+        {
+            Initialize();
+
+            _renderer = renderer;
+        }
+
+        public void Dispose()
+        {
+            if (_shaderProgram != 0)
+            {
+                GL.DeleteProgram(_shaderProgram);
+                _textureStorage?.Dispose();
+            }
+        }
+
+        private void Initialize()
+        {
+            _shaderProgram = ShaderHelper.CompileProgram(EmbeddedResources.ReadAllText("Ryujinx.Graphics.OpenGL/Effects/Shaders/fxaa.glsl"), ShaderType.ComputeShader);
+
+            _resolutionUniform = GL.GetUniformLocation(_shaderProgram, "invResolution");
+            _inputUniform = GL.GetUniformLocation(_shaderProgram, "inputTexture");
+            _outputUniform = GL.GetUniformLocation(_shaderProgram, "imgOutput");
+        }
+
+        public TextureView Run(TextureView view, int width, int height)
+        {
+            if (_textureStorage == null || _textureStorage.Info.Width != view.Width || _textureStorage.Info.Height != view.Height)
+            {
+                _textureStorage?.Dispose();
+                _textureStorage = new TextureStorage(_renderer, view.Info, view.ScaleFactor);
+                _textureStorage.CreateDefaultView();
+            }
+
+            var textureView = _textureStorage.CreateView(view.Info, 0, 0) as TextureView;
+
+            int previousProgram = GL.GetInteger(GetPName.CurrentProgram);
+            int previousUnit = GL.GetInteger(GetPName.ActiveTexture);
+            GL.ActiveTexture(TextureUnit.Texture0);
+            int previousTextureBinding = GL.GetInteger(GetPName.TextureBinding2D);
+
+            GL.BindImageTexture(0, textureView.Handle, 0, false, 0, TextureAccess.ReadWrite, SizedInternalFormat.Rgba8);
+            GL.UseProgram(_shaderProgram);
+
+            var dispatchX = BitUtils.DivRoundUp(view.Width, IPostProcessingEffect.LocalGroupSize);
+            var dispatchY = BitUtils.DivRoundUp(view.Height, IPostProcessingEffect.LocalGroupSize);
+
+            view.Bind(0);
+            GL.Uniform1(_inputUniform, 0);
+            GL.Uniform1(_outputUniform, 0);
+            GL.Uniform2(_resolutionUniform, (float)view.Width, (float)view.Height);
+            GL.DispatchCompute(dispatchX, dispatchY, 1);
+            GL.UseProgram(previousProgram);
+            GL.MemoryBarrier(MemoryBarrierFlags.ShaderImageAccessBarrierBit);
+
+            (_renderer.Pipeline as Pipeline).RestoreImages1And2();
+
+            GL.ActiveTexture(TextureUnit.Texture0);
+            GL.BindTexture(TextureTarget.Texture2D, previousTextureBinding);
+
+            GL.ActiveTexture((TextureUnit)previousUnit);
+
+            return textureView;
+        }
+    }
+}
\ No newline at end of file
-- 
cgit v1.2.3