Get shader to work

.editorconfig

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+root = true
+
+[*]
+charset = utf-8

.gitattributes

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+# Normalize EOL for all files that Git considers text files.
+* text=auto eol=lf

.gitignore

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+# Godot 4+ specific ignores
+.godot/
+/android/

icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="128" height="128"><rect width="124" height="124" x="2" y="2" fill="#363d52" stroke="#212532" stroke-width="4" rx="14"/><g fill="#fff" transform="translate(12.322 12.322)scale(.101)"><path d="M105 673v33q407 354 814 0v-33z"/><path fill="#478cbf" d="m105 673 152 14q12 1 15 14l4 67 132 10 8-61q2-11 15-15h162q13 4 15 15l8 61 132-10 4-67q3-13 15-14l152-14V427q30-39 56-81-35-59-83-108-43 20-82 47-40-37-88-64 7-51 8-102-59-28-123-42-26 43-46 89-49-7-98 0-20-46-46-89-64 14-123 42 1 51 8 102-48 27-88 64-39-27-82-47-48 49-83 108 26 42 56 81zm0 33v39c0 276 813 276 814 0v-39l-134 12-5 69q-2 10-14 13l-162 11q-12 0-16-11l-10-65H446l-10 65q-4 11-16 11l-162-11q-12-3-14-13l-5-69z"/><path d="M483 600c0 34 58 34 58 0v-86c0-34-58-34-58 0z"/><circle cx="725" cy="526" r="90"/><circle cx="299" cy="526" r="90"/></g><g fill="#414042" transform="translate(12.322 12.322)scale(.101)"><circle cx="307" cy="532" r="60"/><circle cx="717" cy="532" r="60"/></g></svg>

icon.svg.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://e05aocekoxi5"
+path="res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.svg"
+dest_files=["res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

main.gdshader

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+shader_type canvas_item;
+
+#define SPIN_ROTATION -2.0
+#define SPIN_SPEED 7.0
+#define OFFSET vec2(0.0)
+#define COLOUR_1 vec4(0.871, 0.267, 0.231, 1.0)
+#define COLOUR_2 vec4(0.0, 0.42, 0.706, 1.0)
+#define COLOUR_3 vec4(0.086, 0.137, 0.145, 1.0)
+#define CONTRAST 3.5
+#define LIGTHING 0.4
+#define SPIN_AMOUNT 0.25
+#define PIXEL_FILTER 745.0
+#define SPIN_EASE 1.0
+#define PI 3.14159265359
+#define IS_ROTATE false
+
+vec4 effect(vec2 screenSize, vec2 screen_coords) {
+    float pixel_size = length(screenSize.xy) / PIXEL_FILTER;
+    vec2 uv = (floor(screen_coords.xy*(1./pixel_size))*pixel_size - 0.5*screenSize.xy)/length(screenSize.xy) - OFFSET;
+    float uv_len = length(uv);
+    
+    float speed = (SPIN_ROTATION*SPIN_EASE*0.2);
+    if(IS_ROTATE){
+       speed = TIME * speed;
+    }
+    speed += 302.2;
+    float new_pixel_angle = atan(uv.y, uv.x) + speed - SPIN_EASE*20.*(1.*SPIN_AMOUNT*uv_len + (1. - 1.*SPIN_AMOUNT));
+    vec2 mid = (screenSize.xy/length(screenSize.xy))/2.;
+    uv = (vec2((uv_len * cos(new_pixel_angle) + mid.x), (uv_len * sin(new_pixel_angle) + mid.y)) - mid);
+    
+    uv *= 30.;
+    speed = TIME*(SPIN_SPEED);
+    vec2 uv2 = vec2(uv.x+uv.y);
+    
+    for(int i=0; i < 5; i++) {
+        uv2 += sin(max(uv.x, uv.y)) + uv;
+        uv  += 0.5*vec2(cos(5.1123314 + 0.353*uv2.y + speed*0.131121),sin(uv2.x - 0.113*speed));
+        uv  -= 1.0*cos(uv.x + uv.y) - 1.0*sin(uv.x*0.711 - uv.y);
+    }
+    
+    float contrast_mod = (0.25*CONTRAST + 0.5*SPIN_AMOUNT + 1.2);
+    float paint_res = min(2., max(0.,length(uv)*(0.035)*contrast_mod));
+    float c1p = max(0.,1. - contrast_mod*abs(1.-paint_res));
+    float c2p = max(0.,1. - contrast_mod*abs(paint_res));
+    float c3p = 1. - min(1., c1p + c2p);
+    float light = (LIGTHING - 0.2)*max(c1p*5. - 4., 0.) + LIGTHING*max(c2p*5. - 4., 0.);
+    return (0.3/CONTRAST)*COLOUR_1 + (1. - 0.3/CONTRAST)*(COLOUR_1*c1p + COLOUR_2*c2p + vec4(c3p*COLOUR_3.rgb, c3p*COLOUR_1.a)) + light;
+}
+
+
+void fragment() {
+	COLOR = effect(vec2(1920, 1080), vec2(UV.x * 1920.0, UV.y * 1080.0));
+}

main.gdshader.uid

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+uid://c2bxvd7878rqy

main.tscn

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+[gd_scene load_steps=4 format=3 uid="uid://vkokd44wy82r"]
+
+[ext_resource type="Shader" uid="uid://c2bxvd7878rqy" path="res://main.gdshader" id="1_ig7tw"]
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_7dm0k"]
+shader = ExtResource("1_ig7tw")
+
+[sub_resource type="PlaceholderTexture2D" id="PlaceholderTexture2D_ig7tw"]
+size = Vector2(1920, 1080)
+
+[node name="Main" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="TextureRect" type="TextureRect" parent="."]
+material = SubResource("ShaderMaterial_7dm0k")
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+texture = SubResource("PlaceholderTexture2D_ig7tw")

project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="balatro-shader"
+config/features=PackedStringArray("4.4", "Forward Plus")
+config/icon="res://icon.svg"
+
+[display]
+
+window/size/viewport_width=1920
+window/size/viewport_height=1080