initial video recording

1 files changed, 54 insertions, 12 deletions

diff --git a/shader.frag b/shader.frag
index 07b7a28..f76c968 100644
--- a/shader.frag
+++ b/shader.frag
@@ -4,14 +4,12 @@ precision mediump float;
 #endif
 
 uniform vec2 resolution;
+uniform float time;
 uniform float ticks;
 uniform int program;
 
 uniform sampler2D images[8];
 layout (binding = 0,rgba32f) uniform image2D backbuffer;
-uniform float ratios[4];
-uniform int idx[2];
-uniform float vel[2];
 uniform float params[4];
 
 out vec4 fragColor;
@@ -20,19 +18,63 @@ float random (in float x) {
   return fract(sin(x)*43758.5453123)-0.5;
 }
 
-vec2 coordinates(int i) {
-	vec2 st = gl_FragCoord.xy/resolution.xy;
+vec2 st() {
+	return gl_FragCoord.xy/resolution.xy;
+}
+ivec2 ist() {
+	return ivec2(gl_FragCoord.xy/resolution.xy*resolution);
+}
+
+vec2 zoom(vec2 st, float amount) {
+  st -= 0.5;
+  st *= amount;
+  st += 0.5;
+  return st;
+}
+
+vec2 translate(vec2 st, vec2 amount) {
+  st -= 0.5;
+  st += amount;
+  st += 0.5;
   return st;
 }
 
+mat2 rotate2d(float _angle){
+  return mat2(cos(_angle),-sin(_angle), sin(_angle),cos(_angle));
+}
+
 void main (void) {
-  vec4 img;
-  vec2 st = coordinates(idx[0]);
-  img = texture2D(images[idx[0]],st);
-  st = coordinates(idx[1]);
-  img = pow(img, texture2D(images[idx[1]],st));
-  if (program != 0) {
-    img.rgb = img.rgb*params[0];
+  vec4 img; 
+  vec2 coord;
+  if (program == 0) {
+    //coord = zoom(st(),0.5*(1.0-params[0]));
+    coord = zoom(st(),sin(time));
+    img = texture2D(images[0],coord);
+    img -= params[1]*(1.0-texture2D(images[1],st()));
+  }
+  else if (program == 1) {
+    coord = zoom(st(),(1.0-1.5*params[0]));
+    img = texture2D(images[3],coord);
+    coord = zoom(st(),0.5*(1.0-0.5*params[2]));
+    vec3 i2 = texture2D(images[2],coord).rgb;
+    img.rgb = pow(img.rgb,5*i2);
   }
+  else if (program == 2) {
+    coord = zoom(st(),(1.0-1.5*params[0]));
+    img = texture2D(images[3],coord);
+    coord = zoom(st(),0.5*(1.0-0.5*params[2]));
+    coord *= rotate2d(ticks); 
+    vec3 i2 = texture2D(images[2],coord).rgb;
+    img.rgb = pow(img.rgb,5*i2);
+  }
+  vec4 feedback = imageLoad(backbuffer,ist());
+  img = mix(img,feedback,0.5);
+  imageStore(backbuffer,ist(),img);
   fragColor = img;
+  /*
+  fragColor = vec4(params[1]);
+    feedback.b += 0.01*cos(time/4.);
+    color.r = max(i.r,feedback.r);
+  */
 }
+