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#version 300 es// UV warping → Heat haze, web GLSL (GLSL ES 3.00). From Creative Center, MIT license.precision highp float;uniform float u_time;uniform vec2 u_resolution; // this pass's output size in pixelsuniform float p_strength; // Strength: 0.006 (0.0 to 0.03)uniform float p_scale; // Ripple scale: 6.0 (1.0 to 20.0)uniform float p_speed; // Rise speed: 3.0 (0.0 to 10.0)uniform float p_height; // Height: 0.6 (0.05 to 1.0)uniform sampler2D t_screen; // the scene's color: linear HDR (RGBA16F), linear filter, clamp to edgein vec2 v_uv;in vec3 v_position;in vec3 v_normal;in vec3 v_view;out vec4 fragColor;struct Inputs {	vec2 uv;	vec3 position;	vec3 normal;	vec3 view;	float time;	vec2 fragCoord;	vec2 resolution;};vec3 u_toSrgb(vec3 c) {	return mix(c * 12.92, 1.055 * pow(c, vec3(1.0 / 2.4)) - 0.055, step(0.0031308, c));}vec4 effect(Inputs i) {	// Scaled by the aspect ratio so the ripples stay round on a wide screen	vec2 p = i.uv * vec2(i.resolution.x / i.resolution.y, 1.0) * p_scale;	float rise = i.time * p_speed;	// Two sines at unrelated frequencies, the first bent by a third, so the pattern never visibly repeats	vec2 wobble = vec2(sin(p.y * 7.0 - rise * 1.3 + sin(p.x * 3.1)), sin(p.x * 5.3 + p.y * 2.0 - rise));	// Hot air hugs the ground: full strength at the bottom of the screen, none above p_height	float mask = 1.0 - smoothstep(0.0, p_height, i.uv.y);	vec2 warped = i.uv + wobble * mask * p_strength;	vec3 scene = texture(t_screen, warped).rgb;	return vec4(scene, 1.0);}void main() {	Inputs i;	i.uv = v_uv;	i.position = v_position;	// Interpolation shortens the vectors between vertices	i.normal = normalize(v_normal);	i.view = normalize(v_view);	i.time = u_time;	i.fragCoord = gl_FragCoord.xy;	i.resolution = u_resolution;	vec4 frag_out = effect(i);	// The output is sRGB: clamped and encoded once, here, with no tone mapping; opaque, so alpha is 1	fragColor = vec4(u_toSrgb(clamp(frag_out.rgb, 0.0, 1.0)), 1.0);}

// UV warping → Heat haze, Godot 4. From Creative Center, MIT license.shader_type spatial;// A full-screen quad over the finished frame: no lighting, no culling, never hidden by depthrender_mode unshaded, cull_disabled, depth_test_disabled;uniform float strength : hint_range(0.0, 0.03, 0.0005) = 0.006;uniform float scale : hint_range(1.0, 20.0, 0.5) = 6.0;uniform float speed : hint_range(0.0, 10.0, 0.1) = 3.0;uniform float height : hint_range(0.05, 1.0, 0.01) = 0.6;uniform sampler2D t_screen : hint_screen_texture, filter_linear, repeat_disable;struct Inputs {	vec2 uv;	vec3 position;	vec3 normal;	vec3 view;	float time;	vec2 fragCoord;	vec2 resolution;};// Godot's textures start at the top-left and the effect's uv at the bottom-left: each sample flips v backvec2 u_flipUv(vec2 uv) {	return vec2(uv.x, 1.0 - uv.y);}vec4 effect(Inputs i) {	// Scaled by the aspect ratio so the ripples stay round on a wide screen	vec2 p = i.uv * vec2(i.resolution.x / i.resolution.y, 1.0) * scale;	float rise = i.time * speed;	// Two sines at unrelated frequencies, the first bent by a third, so the pattern never visibly repeats	vec2 wobble = vec2(sin(p.y * 7.0 - rise * 1.3 + sin(p.x * 3.1)), sin(p.x * 5.3 + p.y * 2.0 - rise));	// Hot air hugs the ground: full strength at the bottom of the screen, none above height	float mask = 1.0 - smoothstep(0.0, height, i.uv.y);	vec2 warped = i.uv + wobble * mask * strength;	vec3 scene = texture(t_screen, u_flipUv(warped)).rgb;	return vec4(scene, 1.0);}void vertex() {	// Put the shader on a MeshInstance3D with a 2x2 QuadMesh in front of the camera; it covers the screen wherever it is	POSITION = vec4(VERTEX.xy, 1.0, 1.0);}void fragment() {	Inputs i;	// SCREEN_UV starts at the top-left; the effect expects GLSL's bottom-left	i.uv = vec2(SCREEN_UV.x, 1.0 - SCREEN_UV.y);	// A flat quad facing the viewer, the same as the site's 2D preview	i.position = vec3(i.uv * 2.0 - 1.0, 0.0);	i.normal = vec3(0.0, 0.0, 1.0);	i.view = vec3(0.0, 0.0, 1.0);	i.time = TIME;	// FRAGCOORD's origin is the top-left too	i.resolution = VIEWPORT_SIZE;	i.fragCoord = vec2(FRAGCOORD.x, i.resolution.y - FRAGCOORD.y);	vec4 frag_out = effect(i);	ALBEDO = frag_out.rgb;}