add Anime4K super resolution support

assets/shaders/Anime4K_AutoDownscalePre_x2.glsl

@@ -0,0 +1,36 @@
+// This is free and unencumbered software released into the public domain.
+
+// Anyone is free to copy, modify, publish, use, compile, sell, or
+// distribute this software, either in source code form or as a compiled
+// binary, for any purpose, commercial or non-commercial, and by any
+// means.
+
+// In jurisdictions that recognize copyright laws, the author or authors
+// of this software dedicate any and all copyright interest in the
+// software to the public domain. We make this dedication for the benefit
+// of the public at large and to the detriment of our heirs and
+// successors. We intend this dedication to be an overt act of
+// relinquishment in perpetuity of all present and future rights to this
+// software under copyright law.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+
+// For more information, please refer to <https://unlicense.org>
+
+//!DESC Anime4K-v4.0-AutoDownscalePre-x2
+//!HOOK MAIN
+//!BIND HOOKED
+//!BIND NATIVE
+//!WHEN OUTPUT.w NATIVE.w / 2.0 < OUTPUT.h NATIVE.h / 2.0 < * OUTPUT.w NATIVE.w / 1.2 > OUTPUT.h NATIVE.h / 1.2 > * *
+//!WIDTH OUTPUT.w
+//!HEIGHT OUTPUT.h
+
+vec4 hook() {
+	return HOOKED_tex(HOOKED_pos);
+}

assets/shaders/Anime4K_AutoDownscalePre_x4.glsl

@@ -0,0 +1,36 @@
+// This is free and unencumbered software released into the public domain.
+
+// Anyone is free to copy, modify, publish, use, compile, sell, or
+// distribute this software, either in source code form or as a compiled
+// binary, for any purpose, commercial or non-commercial, and by any
+// means.
+
+// In jurisdictions that recognize copyright laws, the author or authors
+// of this software dedicate any and all copyright interest in the
+// software to the public domain. We make this dedication for the benefit
+// of the public at large and to the detriment of our heirs and
+// successors. We intend this dedication to be an overt act of
+// relinquishment in perpetuity of all present and future rights to this
+// software under copyright law.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+
+// For more information, please refer to <https://unlicense.org>
+
+//!DESC Anime4K-v3.2-AutoDownscalePre-x4
+//!HOOK MAIN
+//!BIND HOOKED
+//!BIND NATIVE
+//!WHEN OUTPUT.w NATIVE.w / 4.0 < OUTPUT.h NATIVE.h / 4.0 < * OUTPUT.w NATIVE.w / 2.4 > OUTPUT.h NATIVE.h / 2.4 > * *
+//!WIDTH OUTPUT.w 2 /
+//!HEIGHT OUTPUT.h 2 /
+
+vec4 hook() {
+	return HOOKED_tex(HOOKED_pos);
+}

assets/shaders/Anime4K_Clamp_Highlights.glsl

@@ -0,0 +1,90 @@
+// MIT License
+
+// Copyright (c) 2019-2021 bloc97
+// All rights reserved.
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+//!DESC Anime4K-v4.0-De-Ring-Compute-Statistics
+//!HOOK MAIN
+//!BIND HOOKED
+//!SAVE STATSMAX
+//!COMPONENTS 1
+
+#define KERNELSIZE 5 //Kernel size, must be an positive odd integer.
+#define KERNELHALFSIZE 2 //Half of the kernel size without remainder. Must be equal to trunc(KERNELSIZE/2).
+
+float get_luma(vec4 rgba) {
+	return dot(vec4(0.299, 0.587, 0.114, 0.0), rgba);
+}
+
+vec4 hook() {
+
+	float gmax = 0.0;
+
+	for (int i=0; i<KERNELSIZE; i++) {
+		float g = get_luma(MAIN_texOff(vec2(i - KERNELHALFSIZE, 0)));
+
+		gmax = max(g, gmax);
+	}
+
+	return vec4(gmax, 0.0, 0.0, 0.0);
+}
+
+//!DESC Anime4K-v4.0-De-Ring-Compute-Statistics
+//!HOOK MAIN
+//!BIND HOOKED
+//!BIND STATSMAX
+//!SAVE STATSMAX
+//!COMPONENTS 1
+
+#define KERNELSIZE 5 //Kernel size, must be an positive odd integer.
+#define KERNELHALFSIZE 2 //Half of the kernel size without remainder. Must be equal to trunc(KERNELSIZE/2).
+
+vec4 hook() {
+
+	float gmax = 0.0;
+
+	for (int i=0; i<KERNELSIZE; i++) {
+		float g = STATSMAX_texOff(vec2(0, i - KERNELHALFSIZE)).x;
+
+		gmax = max(g, gmax);
+	}
+
+	return vec4(gmax, 0.0, 0.0, 0.0);
+}
+
+//!DESC Anime4K-v4.0-De-Ring-Clamp
+//!HOOK PREKERNEL
+//!BIND HOOKED
+//!BIND STATSMAX
+
+float get_luma(vec4 rgba) {
+	return dot(vec4(0.299, 0.587, 0.114, 0.0), rgba);
+}
+
+vec4 hook() {
+
+	float current_luma = get_luma(HOOKED_tex(HOOKED_pos));
+	float new_luma = min(current_luma, STATSMAX_tex(HOOKED_pos).x);
+
+	//This trick is only possible if the inverse Y->RGB matrix has 1 for every row... (which is the case for BT.709)
+	//Otherwise we would need to convert RGB to YUV, modify Y then convert back to RGB.
+    return HOOKED_tex(HOOKED_pos) - (current_luma - new_luma); 
+}