anamorphic widescreen correction shader (#160)

* anamorphic shader

* Create anamorphic.slang

* Update anamorphic.slang

* better botton resize

* Update anamorphic.slang

anamorphic/anamorphic.slangp

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+shaders = 1
+
+shader0 = shaders/anamorphic.slang
+filter_linear0 = true

anamorphic/shaders/anamorphic.slang

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+#version 450
+
+/*
+	Anamorphic v1.1b Shader 2020
+	by Nerboruto 
+	
+	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.
+*/
+
+layout(push_constant) uniform Push
+{
+	vec4 SourceSize;
+	vec4 OriginalSize;
+	vec4 OutputSize;
+	float exc;
+	float upc;
+	float btc;
+	float exp;
+	float vuc;
+	float vab;
+} params;
+
+#pragma parameter exc "orizontal correction hack (games where players stay at center)" 0.0 -10.0 10.0 0.5
+#pragma parameter exp "border hack (hack for 2d games extra correction prepass)" 1.0 0.0 1.0 1.0
+#pragma parameter vuc "vertical Upper resize hack (most important first pass)" 0.0 0.0 10.0 0.5
+#pragma parameter vab "vertical alf resize hack (second pass 90-85 optimal)" 1.0 0.5 1.0 0.05
+#pragma parameter upc "Upper  vertical Crop" 0.0 -0.5 10.0 0.5
+#pragma parameter btc "Bottom vertical Crop" 0.0 -0.5 10.0 0.5
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+	mat4 MVP;
+} global;
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+void main()
+{
+   gl_Position = global.MVP * Position;
+   vTexCoord = TexCoord;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+//orizontal
+float AnamorphX(float CoordX)
+{
+	if (params.exc == 0.0) return 1.0;
+	float rx = length(CoordX);
+	float fx = -radians(params.exc);
+	return (1.0-fx)/(1.0-fx*rx);
+}
+//vertical prepass
+float AnamorphYP(float CoordY)
+{
+	float ryp = length(CoordY);
+	float fyp = radians(6);
+	if (ryp < 0.925) return 1.0;
+	return (1.0-fyp)/((1.0-(1.0-0.925)*0.1)-fyp*ryp);
+}
+//Upper vertical
+float AnamorphYU(float CoordY)
+{
+	if (params.vuc == 0.0) return 1.0;
+	float ryu = CoordY;
+	float fyu = -radians(params.vuc*0.5);
+	if (ryu > 0.0) return 1.0;
+	return (1.0-fyu)/(1.0-fyu*ryu);
+}
+//alf vertical
+float AnamorphAB(float CoordY)
+{
+	if (params.vab == 1.0) return 1.0;
+	float rab = length(CoordY);
+	float fab = radians(6);
+	if (rab < params.vab) return 1.0;
+	return (1.0-fab)/((1.0-(1.0-params.vab)*0.1)-fab*rab);
+}
+//orizontal border
+float AnamorphB(float CoordB)
+{
+	float rb = length(CoordB);
+	float fb = -radians(45);
+	if (rb < 0.99) return 1.0;
+	return (1.0-fb)/(1.0078125-fb*rb);
+}
+
+void main()
+{
+	vec2 RCoord = vTexCoord * 2.0 - 1.0;
+	if (params.exp == 1.0)
+	{
+	RCoord.x *=1.0105;
+	RCoord.x *= AnamorphB(RCoord.x);
+	RCoord.y *= AnamorphYP(RCoord.y);
+	RCoord.y *=0.9925;
+	}
+	RCoord.x *= AnamorphX(RCoord.x);
+	RCoord.y *= AnamorphYU(RCoord.y);
+	RCoord.y *= AnamorphAB(RCoord.y);
+	RCoord = RCoord * 0.5 + 0.5;
+	RCoord.y = (RCoord.y+(params.upc+params.vuc)*0.01)/(1.0+(params.upc+params.btc+params.vuc)*0.01);
+	vec3 res = texture(Source, RCoord).rgb;
+    FragColor = vec4(res,0.0);
+}