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GodotRetro/Screen Shaders/Aditional Shaders/Sharpness.shader

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+//SHADER ORIGINALY CREADED BY "Nihilistic_Furry" FROM SHADERTOY
+//MODIFIED AND PORTED TO GODOT BY AHOPNESS (@ahopness)
+//LICENSE : CC0
+//COMATIBLE WITH : GLES2, GLES3, WEBGL
+//SHADERTOY LINK : https://www.shadertoy.com/view/wsK3Wt
+
+shader_type canvas_item;
+
+uniform float sharpen_amount :hint_range(0,4) = 1.0;
+
+vec4 sharpenMask (sampler2D st, vec2 fc, vec2 sps){
+	// Sharpen detection matrix [0,1,0],[1,-4,1],[0,1,0]
+	// Colors
+	vec4 up = texture (st, (fc + vec2 (0, 1))/sps);
+	vec4 left = texture (st, (fc + vec2 (-1, 0))/sps);
+	vec4 center = texture (st, fc/sps);
+	vec4 right = texture (st, (fc + vec2 (1, 0))/sps);
+	vec4 down = texture (st, (fc + vec2 (0, -1))/sps);
+	
+	// Return edge detection
+	return (1.0 + 4.0*sharpen_amount)*center -sharpen_amount*(up + left + right + down);
+}
+
+void fragment(){
+	// Detect edges and output to screen
+	COLOR = sharpenMask (SCREEN_TEXTURE, FRAGCOORD.xy, 1.0 / SCREEN_PIXEL_SIZE);
+}