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February 3, 2025 07:28
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| private const val TUNNEL_SHADER_SRC = """ | |
| uniform float2 iResolution; | |
| uniform float iTime; | |
| uniform shader composable; | |
| float2x2 rotate2D(float r) { | |
| return float2x2( | |
| cos(r), sin(r), | |
| -sin(r), cos(r) | |
| ); | |
| } | |
| float3x3 rotate3D(float angle, float3 axis) { | |
| float3 a = normalize(axis); | |
| float s = sin(angle); | |
| float c = cos(angle); | |
| float r = 1.0 - c; | |
| return float3x3( | |
| a.x * a.x * r + c, | |
| a.y * a.x * r + a.z * s, | |
| a.z * a.x * r - a.y * s, | |
| a.x * a.y * r - a.z * s, | |
| a.y * a.y * r + c, | |
| a.z * a.y * r + a.x * s, | |
| a.x * a.z * r + a.y * s, | |
| a.y * a.z * r - a.x * s, | |
| a.z * a.z * r + c | |
| ); | |
| } | |
| half4 main(float2 FC) { | |
| float4 o = float4(0.0); | |
| float2 r = iResolution.xy; | |
| float3 v = float3(1.0, 3.0, 7.0); | |
| float3 p = float3(0.0); | |
| float t = iTime; | |
| float n = 0.0; | |
| float e = 0.0; | |
| float g = 0.0; | |
| float k = t * 0.2; | |
| for (int i = 0; i < 100; i++) { | |
| p = float3((FC.xy - r * 0.5) / r.y * g, g) * rotate3D(k, cos(k + v)); | |
| p.z += t; | |
| p = asin(sin(p)) - 3.0; | |
| n = 0.0; | |
| for (int j = 0; j < 9; j++) { | |
| float2x2 rotation = rotate2D(g/8.0); | |
| p.xz = float2( | |
| rotation[0][0] * p.x + rotation[0][1] * p.z, | |
| rotation[1][0] * p.x + rotation[1][1] * p.z | |
| ); | |
| p = abs(p); | |
| if (p.x < p.y) { | |
| n += 1.0; | |
| p = p.zxy; | |
| } else { | |
| p = p.zyx; | |
| } | |
| p += p - v; | |
| } | |
| e = max(p.x, p.z) / 1000.0 - 0.01; | |
| g += e; | |
| o.rgb += 0.1/exp(cos(v*g*0.1+n) + 3.0 + 10000.0*e); | |
| } | |
| return half4(o.rgb, 1.0); | |
| } | |
| """ | |
| @RequiresApi(Build.VERSION_CODES.TIRAMISU) | |
| @Composable | |
| fun TunnelShader() { | |
| val shader = remember { RuntimeShader(TUNNEL_SHADER_SRC) } | |
| var time by remember { mutableStateOf(0f) } | |
| LaunchedEffect(Unit) { | |
| while(true) { | |
| time = (System.currentTimeMillis() % 100_000L) / 1_000f | |
| delay(16) // ~60 FPS | |
| } | |
| } | |
| Surface( | |
| modifier = Modifier | |
| .fillMaxSize() | |
| .graphicsLayer { | |
| clip = true | |
| shader.setFloatUniform("iTime", time) | |
| shader.setFloatUniform("iResolution", size.width, size.height) | |
| renderEffect = android.graphics.RenderEffect | |
| .createRuntimeShaderEffect(shader, "composable") | |
| .asComposeRenderEffect() | |
| }, | |
| color = MaterialTheme.colorScheme.background | |
| ) { | |
| Box(modifier = Modifier.fillMaxSize()) | |
| } | |
| } |
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