鱼眼镜头 shader 验证

scene/ground/script/c03/鱼眼景深镜头.gd

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+extends Node2D
+
+@export var camera_rect: Rect2
+
+@onready var camera = %Camera2D as Camera2D
+
+var speed := 150
+var current_speed := Vector2.ZERO
+
+
+func _process(delta: float) -> void:
+	# move camera according to current_speed
+	var direction = Vector2(Input.get_axis("left", "right"), Input.get_axis("up", "down"))
+	current_speed = direction * speed
+	camera.position += current_speed * delta
+	# clamp inside camera_rect
+	if camera_rect:
+		camera.position.x = clamp(
+			camera.position.x, camera_rect.position.x, camera_rect.position.x + camera_rect.size.x
+		)
+		camera.position.y = clamp(
+			camera.position.y, camera_rect.position.y, camera_rect.position.y + camera_rect.size.y
+		)

scene/ground/script/c03/鱼眼景深镜头.gd.uid

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+uid://c17bw2w6a8na6

scene/ground/script/c03/鱼眼景深镜头.tscn

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+[gd_scene load_steps=5 format=3 uid="uid://deniapgcn3bv7"]
+
+[ext_resource type="Script" uid="uid://c17bw2w6a8na6" path="res://scene/ground/script/c03/鱼眼景深镜头.gd" id="1_56a8k"]
+[ext_resource type="Texture2D" uid="uid://jnnm4gb8tsp5" path="res://asset/art/scene/c01/s01_旧版序章/bg_夜晚有墙.png" id="1_pns71"]
+[ext_resource type="Material" uid="uid://dp4uwpm8jlic2" path="res://scene/ground/script/c03/鱼眼镜头material.tres" id="2_v28hk"]
+[ext_resource type="Texture2D" uid="uid://dxcn4gha8l5ce" path="res://asset/art/scene/c01/s01_旧版序章/e_老奶奶喂老鼠.png" id="3_q5xjx"]
+
+[node name="鱼眼景深镜头" type="Node2D"]
+script = ExtResource("1_56a8k")
+camera_rect = Rect2(-550, -150, 1100, 300)
+metadata/_edit_horizontal_guides_ = [-121.0]
+
+[node name="ParallaxBackground" type="ParallaxBackground" parent="."]
+
+[node name="BGLayer" type="ParallaxLayer" parent="ParallaxBackground"]
+
+[node name="Sprite2D" type="Sprite2D" parent="ParallaxBackground/BGLayer"]
+texture = ExtResource("1_pns71")
+
+[node name="Layer1" type="ParallaxLayer" parent="ParallaxBackground"]
+position = Vector2(1, 17)
+motion_scale = Vector2(1.05, 1.01)
+
+[node name="Sprite2D" type="Sprite2D" parent="ParallaxBackground/Layer1"]
+position = Vector2(-2, 55)
+texture = ExtResource("3_q5xjx")
+
+[node name="Camera2D" type="Camera2D" parent="ParallaxBackground"]
+unique_name_in_owner = true
+position_smoothing_enabled = true
+position_smoothing_speed = 7.0
+
+[node name="ColorRect" type="ColorRect" parent="ParallaxBackground"]
+material = ExtResource("2_v28hk")
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2

scene/ground/script/c03/鱼眼镜头.gdshader

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+//https://godotshaders.com/shader/fisheye-shader/
+shader_type canvas_item;
+uniform sampler2D SCREEN_TEXTURE:hint_screen_texture,filter_linear;
+// 鱼眼效果强度控制
+uniform float fish_intensity : hint_range(0.0, 2.0) = 1.0;
+void fragment() {
+    // 获取屏幕分辨率
+    vec2 iResolution = vec2(textureSize(SCREEN_TEXTURE, 0));
+    // 基础UV坐标（适配Godot坐标系）
+    vec2 uv = UV;
+    uv.y = 1.0 - uv.y; // 翻转Y轴
+
+    // 宽高比计算
+    float aspectRatio = iResolution.x / iResolution.y;
+
+    // 计算强度参数
+    float strength = fish_intensity * 0.03;
+    vec2 intensity = vec2(
+        strength * aspectRatio,
+        strength * aspectRatio
+    );
+
+    // 坐标转换到[-1, 1]范围
+    vec2 coords = uv;
+    coords = (coords - 0.5) * 2.0;
+
+    // 计算坐标偏移量
+    vec2 realCoordOffs;
+    realCoordOffs.x = (1.0 - coords.y * coords.y) * intensity.y * coords.x;
+    realCoordOffs.y = (1.0 - coords.x * coords.x) * intensity.x * coords.y;
+
+    // 应用偏移
+    vec2 fuv = uv - realCoordOffs;
+    // 边界检查
+    if(fuv.x < 0.0 || fuv.x > 1.0 || fuv.y < 0.0 || fuv.y > 1.0) {
+        COLOR = vec4(0.0); // 超出范围显示黑
+		vec4 color = texture(SCREEN_TEXTURE,fuv);
+		COLOR.rgb=mix(color.rgb,color.bgr,length(fuv-0.5));
+    } else {
+        // 采样时再次翻转Y轴适配Godot坐标系
+        fuv.y = 1.0 - fuv.y;
+        COLOR = texture(SCREEN_TEXTURE, fuv);
+		vec4 color = texture(SCREEN_TEXTURE,fuv);
+		COLOR.rgb=mix(color.rgb,color.bgr,length(fuv-0.5));
+    }
+}

scene/ground/script/c03/鱼眼镜头.gdshader.uid

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+uid://8q6t3vnuqc5e

scene/ground/script/c03/鱼眼镜头crt.gdshader

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+//based on https://godotshaders.com/shader/crt-shader-2/
+shader_type canvas_item;
+uniform sampler2D screen_texture : hint_screen_texture, repeat_disable, filter_nearest;
+uniform float fisheye_strength = 1.0; // Adjust this to control the fisheye effect strength
+
+vec2 fisheye(vec2 uv) {
+    vec2 d = uv - 0.5;
+    float r = length(d);
+    float theta = atan(d.y, d.x);
+    float rf = pow(r, fisheye_strength) / pow(0.5, fisheye_strength - 1.0);
+    return vec2(0.5) + rf * normalize(d);
+}
+
+vec2 curve(vec2 uv)
+{
+	uv = (uv - 0.5) * 2.0;
+	uv *= 1.1;
+	uv.x *= 1.0 + pow((abs(uv.y) / 5.0), 2.0);
+	uv.y *= 1.0 + pow((abs(uv.x) / 4.0), 2.0);
+	uv  = (uv / 2.0) + 0.5;
+	uv =  uv *0.92 + 0.04;
+	return uv;
+}
+
+void fragment() {
+    vec2 iResolution = 1.0 / SCREEN_PIXEL_SIZE;
+    vec2 q = FRAGCOORD.xy / iResolution.xy;
+
+    // Apply fisheye distortion
+    q = fisheye(q);
+
+    vec2 uv = curve(q);
+    uv = curve( uv );
+    vec3 oricol = texture( screen_texture, vec2(q.x,q.y) ).xyz;
+    vec3 col;
+	float x =  sin(0.3*TIME+uv.y*21.0)*sin(0.7*TIME+uv.y*29.0)*sin(0.3+0.33*TIME+uv.y*31.0)*0.0017;
+
+    col.r = texture(screen_texture,vec2(x+uv.x+0.001,uv.y+0.001)).x+0.05;
+    col.g = texture(screen_texture,vec2(x+uv.x+0.000,uv.y-0.002)).y+0.05;
+    col.b = texture(screen_texture,vec2(x+uv.x-0.002,uv.y+0.000)).z+0.05;
+    col.r += 0.08*texture(screen_texture,0.75*vec2(x+0.025, -0.027)+vec2(uv.x+0.001,uv.y+0.001)).x;
+    col.g += 0.05*texture(screen_texture,0.75*vec2(x+-0.022, -0.02)+vec2(uv.x+0.000,uv.y-0.002)).y;
+    col.b += 0.08*texture(screen_texture,0.75*vec2(x+-0.02, -0.018)+vec2(uv.x-0.002,uv.y+0.000)).z;
+
+    col = clamp(col*0.6+0.4*col*col*1.0,0.0,1.0);
+
+    float vig = (0.0 + 1.0*16.0*uv.x*uv.y*(1.0-uv.x)*(1.0-uv.y));
+	col *= vec3(pow(vig,0.3));
+
+    col *= vec3(0.95,1.05,0.95);
+	col *= 2.8;
+
+	float scans = clamp( 0.35+0.35*sin(3.5*TIME+uv.y*iResolution.y*1.5), 0.0, 1.0);
+
+	float s = pow(scans,1.7);
+	col = col*vec3( 0.4+0.7*s) ;
+
+    col *= 1.0+0.01*sin(110.0*TIME);
+	if (uv.x < 0.0 || uv.x > 1.0)
+		col *= 0.0;
+	if (uv.y < 0.0 || uv.y > 1.0)
+		col *= 0.0;
+
+	col*=1.0-0.65*vec3(clamp((mod(FRAGCOORD.x, 2.0)-1.0)*2.0,0.0,1.0));
+
+    float comp = smoothstep( 0.1, 0.9, sin(TIME) );
+
+
+    COLOR = vec4(col,1.0);
+}

scene/ground/script/c03/鱼眼镜头crt.gdshader.uid

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+uid://df554t3pmm2i3

scene/ground/script/c03/鱼眼镜头material.tres

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+[gd_resource type="ShaderMaterial" load_steps=2 format=3 uid="uid://dp4uwpm8jlic2"]
+
+[ext_resource type="Shader" uid="uid://8q6t3vnuqc5e" path="res://scene/ground/script/c03/鱼眼镜头.gdshader" id="1_yexoo"]
+
+[resource]
+shader = ExtResource("1_yexoo")
+shader_parameter/fish_intensity = 1.454