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

1 files changed, 37 insertions, 0 deletions

diff --git a/Ryujinx.Graphics.OpenGL/Effects/Shaders/fsr_sharpening.glsl b/Ryujinx.Graphics.OpenGL/Effects/Shaders/fsr_sharpening.glsl
new file mode 100644
index 00000000..d3b98729
--- /dev/null
+++ b/Ryujinx.Graphics.OpenGL/Effects/Shaders/fsr_sharpening.glsl
@@ -0,0 +1,37 @@
+#version 430 core
+precision mediump float;
+layout (local_size_x = 64) in;
+layout(rgba8, binding = 0, location=0) uniform image2D imgOutput;
+layout( location=1 ) uniform sampler2D source;
+layout( location=2 ) uniform float sharpening;
+
+#define A_GPU 1
+#define A_GLSL 1
+#include "ffx_a.h"
+
+#define FSR_RCAS_F 1
+AU4 con0;
+
+AF4 FsrRcasLoadF(ASU2 p) { return AF4(texelFetch(source, p, 0)); }
+void FsrRcasInputF(inout AF1 r, inout AF1 g, inout AF1 b) {}
+
+#include "ffx_fsr1.h"
+
+void CurrFilter(AU2 pos)
+{
+    AF3 c;
+    FsrRcasF(c.r, c.g, c.b, pos, con0);
+    imageStore(imgOutput, ASU2(pos), AF4(c, 1));
+}
+
+void main() {
+    FsrRcasCon(con0, sharpening);
+    AU2 gxy = ARmp8x8(gl_LocalInvocationID.x) + AU2(gl_WorkGroupID.x << 4u, gl_WorkGroupID.y << 4u);
+    CurrFilter(gxy);
+    gxy.x += 8u;
+    CurrFilter(gxy);
+    gxy.y += 8u;
+    CurrFilter(gxy);
+    gxy.x -= 8u;
+    CurrFilter(gxy);
+}
\ No newline at end of file