borger

fragment.glsl

@@ -1,23 +1,49 @@
 #version 320 es
 
-precision mediump float;
+precision highp float;
+precision highp int;
+precision lowp sampler2D;
+precision lowp samplerCube;
 
 uniform vec2 WindowSize;
 uniform float time;
 layout(location = 0) out vec4 color;
 
-float rand(ivec2 co) {
-    return fract(sin(dot(vec2(co), vec2(12.9898, 78.233))) * 43758.5453);
+float lerp(float a, float b, float x) {
+    return a + x*(b-a);
+}
+
+uint xxhash32(uvec2 p) {
+    const uint PRIME32_2 = 2246822519U, PRIME32_3 = 3266489917U;
+	const uint PRIME32_4 = 668265263U, PRIME32_5 = 374761393U;
+    uint h32 = p.y + PRIME32_5 + p.x*PRIME32_3;
+    h32 = PRIME32_4*((h32 << 17) | (h32 >> (32 - 17)));
+    h32 = PRIME32_2*(h32^(h32 >> 15));
+    h32 = PRIME32_3*(h32^(h32 >> 13));
+    return h32^(h32 >> 16);
+}
+
+//const uint k = 1103515245U;
+//
+//vec3 hash33( uvec3 x ) {
+//    x = ((x >> 8U) ^ x.yzx) * k;
+//    x = ((x >> 8U) ^ x.yzx) * k;
+//    x = ((x >> 8U) ^ x.yzx) * k;
+//    return vec3(x) * (1.0 / float(0xffffffffU));
+//}
+
+float rand(vec2 v, float seed) {
+    uint hash = xxhash32(uvec2(v * 10000.0 + seed * 10000.0));
+    return float(hash) * (1.0/float(0xffffffffu));
 }
 
 float cell_size = 0.01;
-
 #define PI 3.1415926538
 
 // whatever that corner contributes
 float c_dot(vec2 point, vec2 corner) {
-    ivec2 c = ivec2(round(corner * 100.0));
-    float angle = rand(c) * 2.0*PI;
+    vec2 c = vec2(ivec2(round(corner * 100.0)));
+    float angle = rand(c, 0.0) * 2.0*PI;
     vec2 random_corner_vec = vec2(cos(angle), sin(angle));
     vec2 offset = (point - corner) / cell_size;
     float dot_product = dot(random_corner_vec, offset);
@@ -25,15 +51,12 @@ float c_dot(vec2 point, vec2 corner) {
     return dot_product;
 }
 
-float lerp(float a, float b, float x) {
-    return a + x*(b-a);
-}
-
 // better than built in smoothstep.
 float fade(float t) {
 	return ((6.0*t - 15.0)*t + 10.0)*t*t*t;
 }
 
+
 void main() {
     // We'll make origin in the top-left.
     vec2 uv = gl_FragCoord.xy / WindowSize;
@@ -57,24 +80,13 @@ void main() {
     float v = fade(tile_uv.y);
     //float u = tile_uv.x;
     //float v = tile_uv.y;
-    //float u = smoothstep(0, 1, tile_uv.x);
-    //float v = smoothstep(0, 1, tile_uv.y);
-    //float val = smoothstep(tile_uv.x, smoothstep(tile_uv.y, c_bl_dot, c_tl_dot), smoothstep(tile_uv.y, c_br_dot, c_tr_dot));
     float val = lerp(lerp(c_tl_dot, c_bl_dot, v), lerp(c_tr_dot, c_br_dot, v), u);
-    //float val = tile_uv.y;
-    //float val = c_bl_dot*2 + 0.5;
-    //val = val * 20;
     float out_val = val /2.0 + 0.5;
-    color = vec4(out_val, out_val, out_val, 1.0);
-
-    //float yes = 0.5 + (c_dot(uv, c_tl) + c_dot(uv, c_tr) + c_dot(uv, c_bl) + c_dot(uv, c_br)) / 2;
-    //FragColor = vec4(yes, yes, yes, 1);
+    //uvec3 p = uvec3(uint(round(uv.x * 500.0)), uint(round(uv.y * 500.0)), 1);
+    //color = vec4( hash33(p), 1.0 );
+    //float lel = noise(vec3(uv * 10.0, 1.0));
+    //float lel = gold_noise(uv, time * 100.0);
+    //float lel = random( uv.x * 100.0 );
+    float lel = rand(uv, 0.0);
+    color = vec4(lel, lel, lel, 1.0);
 }
-
-//#version 320 es
-//precision mediump float;
-//layout(location = 0) out vec4 outColor;
-//
-//void main() {
-//    outColor = vec4(1.0, 0.0, 0.0, 1.0);
-//}