cool cool cool

learning/2d_matrices/yuvcolor.frag

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+#ifdef GL_ES
+precision mediump float;
+#endif
+uniform vec2 u_resolution;
+uniform vec2 u_mouse;
+uniform float u_time;
+
+#define PI 3.14159265359
+
+const vec3 uAColor = vec3(.5,.5,.5);
+const vec3 uBColor = vec3(.5,.5,.5);
+const vec3 uCColor = vec3(1.,1.,1.);
+const vec3 uDColor = vec3(.0,.33,.67);
+
+//get colors from http://dev.thi.ng/gradients/
+vec3 cosPalette(float t) { return uAColor + uBColor*cos(6.28318*(uCColor*t+uDColor)); }
+
+mat3 yuv2rgb = mat3(1.,.0,1.13983,
+                    1.,-.39465,-.58060,
+                    1.,2.03211,.0);
+
+mat3 rgb2yuv = mat3(.2125,.7152,.0722,-.09991,-.33609,.43600,.615,-.5586,-.05639);
+
+void main() {
+  vec2 st = gl_FragCoord.xy/u_resolution;
+  st.x *= u_resolution.x/u_resolution.y;
+  st = (st-.5)*2.;
+  vec3 color = vec3(0.0,0.0,0.0);
+  float alpha = 1.0;
+  color = yuv2rgb * vec3(.5,st.x,st.y);
+  
+
+  gl_FragColor = vec4(color, alpha);
+}