Set the selection texture's filter to nearest in shaders

src/Shaders/ColorReplace.gdshader

@@ -9,7 +9,7 @@ uniform float similarity_percent : hint_range(0.0, 100.0);
 
 // Must be the same size as image
 // Selected pixels are 1,1,1,1 and unselected 0,0,0,0
-uniform sampler2D selection;
+uniform sampler2D selection : filter_nearest;
 
 uniform bool has_pattern;
 uniform sampler2D pattern: repeat_enable;

src/Shaders/Effects/Desaturate.gdshader

@@ -5,7 +5,7 @@ uniform bool red = true;
 uniform bool blue = true;
 uniform bool green = true;
 uniform bool alpha = false;
-uniform sampler2D selection;
+uniform sampler2D selection : filter_nearest;
 
 float stolChannel(float x) {
 	return (x < 0.04045) ? (x / 12.92) : pow((x + 0.055) / 1.055, 2.4);

src/Shaders/Effects/DropShadow.gdshader

@@ -3,7 +3,7 @@ render_mode unshaded;
 
 uniform vec2 offset = vec2(5.0, 5.0); // Offset, in pixel coordinate [0, 1, 2, and so on]
 uniform vec4 shadow_color : source_color = vec4(0.08, 0.08, 0.08, 0.63);
-uniform sampler2D selection;
+uniform sampler2D selection : filter_nearest;
 
 
 void fragment() {

src/Shaders/Effects/GradientMap.gdshader

@@ -2,7 +2,7 @@ shader_type canvas_item;
 render_mode unshaded;
 
 uniform sampler2D gradient_map : filter_nearest;  // GradientTexture
-uniform sampler2D selection;
+uniform sampler2D selection : filter_nearest;
 
 void fragment() {
 	vec4 original_color = texture(TEXTURE, UV);

src/Shaders/Effects/Gradients/Linear.gdshader

@@ -1,8 +1,8 @@
 shader_type canvas_item;
 render_mode unshaded;
 
-uniform sampler2D selection;
-uniform sampler2D gradient_texture;
+uniform sampler2D selection : filter_nearest;
+uniform sampler2D gradient_texture : filter_nearest;
 uniform float position : hint_range(-0.5, 0.5) = 0.0;
 uniform float size : hint_range(0.01, 2.0) = 1.0;
 uniform float angle : hint_range(0.0, 360.0) = 0.0;

src/Shaders/Effects/Gradients/LinearDithering.gdshader

@@ -1,10 +1,10 @@
 shader_type canvas_item;
 render_mode unshaded;
 
-uniform sampler2D selection;
-uniform sampler2D gradient_texture;
-uniform sampler2D dither_texture : repeat_enable;
-uniform sampler2D offset_texture;
+uniform sampler2D selection : filter_nearest;
+uniform sampler2D gradient_texture : filter_nearest;
+uniform sampler2D dither_texture : filter_nearest, repeat_enable;
+uniform sampler2D offset_texture : filter_nearest;
 uniform float position : hint_range(-0.5, 0.5) = 0.0;
 uniform float size : hint_range(0.01, 2.0) = 1.0;
 uniform float angle : hint_range(0.0, 360.0) = 0.0;
@@ -69,9 +69,9 @@ void fragment() {
 		modified_uv = mirror_fract(modified_uv);
 
 	int n_of_colors = textureSize(offset_texture, 0).x;
+	float colors_minus = float(n_of_colors - 1);
 	vec4 output;
 	for (int i = 1; i <= n_of_colors; i++) {
-		float colors_minus = float(n_of_colors - 1);
 		float off = texture(offset_texture, vec2(float(i) / colors_minus)).r;
 		float off_prev = texture(offset_texture, vec2(float(i - 1) / colors_minus)).r;
 		vec4 first = texture(gradient_texture, vec2(float((i - 1)) / colors_minus));

src/Shaders/Effects/HSV.gdshader

@@ -4,7 +4,7 @@ render_mode unshaded;
 uniform float hue : hint_range(-1, 1);
 uniform float saturation : hint_range(-1, 1);
 uniform float value : hint_range(-1, 1);
-uniform sampler2D selection;
+uniform sampler2D selection : filter_nearest;
 
 vec3 rgb2hsb(vec3 c){
 	vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);

src/Shaders/Effects/Invert.gdshader

@@ -5,7 +5,7 @@ uniform bool red = true;
 uniform bool blue = true;
 uniform bool green = true;
 uniform bool alpha = false;
-uniform sampler2D selection;
+uniform sampler2D selection : filter_nearest;
 
 
 void fragment() {

src/Shaders/Effects/OffsetPixels.gdshader

@@ -1,6 +1,6 @@
 shader_type canvas_item;
 
-uniform sampler2D selection;
+uniform sampler2D selection : filter_nearest;
 uniform vec2 offset = vec2(0.0); // In pixels
 uniform bool wrap_around = false;
 

src/Shaders/Effects/OutlineInline.gdshader

@@ -6,7 +6,7 @@ uniform vec4 color : source_color = vec4(1.0);
 uniform float width : hint_range(0, 10, 1) = 1.0;
 uniform int pattern : hint_range(0, 2) = 0; // diamond, circle, square
 uniform bool inside = false;
-uniform sampler2D selection;
+uniform sampler2D selection : filter_nearest;
 
 
 bool has_contrary_neighbour(vec2 uv, vec2 texture_pixel_size, sampler2D tex) {

src/Shaders/Effects/Palettize.gdshader

@@ -3,7 +3,7 @@
 shader_type canvas_item;
 
 uniform sampler2D palette_texture : filter_nearest;
-uniform sampler2D selection;
+uniform sampler2D selection : filter_nearest;
 
 vec4 swap_color(vec4 color) {
 	if (color.a <= 0.01) {

src/Shaders/Effects/Pixelize.gdshader

@@ -7,7 +7,7 @@ This shader is under MIT license
 shader_type canvas_item;
 
 uniform uvec2 pixel_size = uvec2(4);
-uniform sampler2D selection;
+uniform sampler2D selection : filter_nearest;
 
 void fragment() {
 	vec4 original_color = texture(TEXTURE, UV);

src/Shaders/Effects/Posterize.gdshader

@@ -1,7 +1,7 @@
 // https://godotshaders.com/shader/color-reduction-and-dither/
 shader_type canvas_item;
 
-uniform sampler2D selection;
+uniform sampler2D selection : filter_nearest;
 uniform float colors : hint_range(1.0, 255.0) = 2.0;
 uniform float dither_intensity : hint_range(0.0, 0.5) = 0.0;
 

src/Shaders/Effects/Rotation/CommonRotation.gdshaderinc

@@ -1,4 +1,4 @@
-uniform sampler2D selection_tex;
+uniform sampler2D selection_tex : filter_nearest;
 uniform vec2 pivot_pixel;
 uniform float angle;
 

src/Shaders/Effects/Rotation/SmearRotxel.gdshader

@@ -2,7 +2,7 @@
 shader_type canvas_item;
 render_mode unshaded;
 
-uniform sampler2D selection_tex;
+uniform sampler2D selection_tex : filter_nearest;
 uniform float initial_angle = 0.0;
 uniform float ending_angle = 0.0;
 uniform float tolerance : hint_range(0.0, 255.0) = 100.0;

src/Shaders/PatternFill.gdshader

@@ -1,8 +1,8 @@
 shader_type canvas_item;
 render_mode unshaded;
 
-uniform sampler2D selection;
-uniform sampler2D pattern: repeat_enable;
+uniform sampler2D selection : filter_nearest;
+uniform sampler2D pattern : filter_nearest, repeat_enable;
 uniform vec2 size;
 uniform vec2 pattern_size;
 uniform vec2 pattern_uv_offset;