Faster shaders (?)

core/assets/shaders/tar.frag

@@ -3,69 +3,29 @@ precision highp float;
 precision mediump int;
 #endif
 
-uniform sampler2D u_texture;
+#define NSCALE 180.0
 
-uniform vec2 camerapos;
-uniform vec2 screensize;
-uniform float time;
+uniform sampler2D u_texture;
+uniform sampler2D u_noise;
+
+uniform vec2 u_campos;
+uniform vec2 u_resolution;
+uniform float u_time;
 
 varying vec4 v_color;
 varying vec2 v_texCoord;
 
-vec3 permute(vec3 x) { return mod(((x*34.0)+1.0)*x, 289.0); }
+void main(){
+    vec2 c = v_texCoord.xy;
+    vec2 coords = vec2(c.x * u_resolution.x + u_campos.x, c.y * u_resolution.y + u_campos.y);
 
-float snoise(vec2 v){
-    const vec4 C = vec4(0.211324865405187, 0.366025403784439,
-           -0.577350269189626, 0.024390243902439);
-    vec2 i  = floor(v + dot(v, C.yy) );
-    vec2 x0 = v -   i + dot(i, C.xx);
-    vec2 i1;
-    i1 = (x0.x > x0.y) ? vec2(1.0, 0.0) : vec2(0.0, 1.0);
-    vec4 x12 = x0.xyxy + C.xxzz;
-    x12.xy -= i1;
-    i = mod(i, 289.0);
-    vec3 p = permute( permute( i.y + vec3(0.0, i1.y, 1.0 ))
-    + i.x + vec3(0.0, i1.x, 1.0 ));
-    vec3 m = max(0.5 - vec3(dot(x0,x0), dot(x12.xy,x12.xy),
-    dot(x12.zw,x12.zw)), 0.0);
-    m = m*m ;
-    m = m*m ;
-    vec3 x = 2.0 * fract(p * C.www) - 1.0;
-    vec3 h = abs(x) - 0.5;
-    vec3 ox = floor(x + 0.5);
-    vec3 a0 = x - ox;
-    m *= 1.79284291400159 - 0.85373472095314 * ( a0*a0 + h*h );
-    vec3 g;
-    g.x  = a0.x  * x0.x  + h.x  * x0.y;
-    g.yz = a0.yz * x12.xz + h.yz * x12.yw;
-    return 130.0 * dot(m, g);
-}
+    float btime = u_time / 8000.0;
+    float noise = (texture2D(u_noise, (coords) / NSCALE + vec2(btime) * vec2(-0.9, 0.8)).r + texture2D(u_noise, (coords) / NSCALE + vec2(btime * 1.1) * vec2(-0.8, -1.0)).r) / 2.0;
+    vec3 color = texture2D(u_texture, c).rgb;
 
-void main() {
-
-	vec2 c = v_texCoord.xy;
-	vec4 color = texture2D(u_texture, c);
-
-	vec2 v = vec2(1.0/screensize.x, 1.0/screensize.y);
-	vec2 coords = vec2(c.x / v.x + camerapos.x, c.y / v.y + camerapos.y);
-
-	float stime = time / 5.0;
-
-	float mscl = 30.0;
-	float mth = 5.0;
-
-    if(color.r > 0.01){
-        color = texture2D(u_texture, c + vec2(sin(stime/3.0 + coords.y/0.75) * v.x, 0.0)) * vec4(0.9, 0.9, 1, 1.0);
-
-        float n1 = snoise(coords / 22.0 + vec2(-time) / 540.0);
-        float n2 = snoise((coords + vec2(632.0)) / 8.0 + vec2(0.0, time) / 510.0);
-
-        float r = (n1 + n2) / 2.0;
-
-        if(r < -0.3 && r > -0.6){
-            color *= 1.4;
-        }
+    if(!(noise > 0.54 && noise < 0.58)){
+        color *= 0.6;
     }
 
-	gl_FragColor = color;
+    gl_FragColor = vec4(color.rgb, 1.0);
 }