header correction + stereo

12/NOTES.md

@@ -1,2 +1,4 @@
 
+https://docs.google.com/spreadsheets/d/194IVZR_xLVsw5H0zJZ7CWuimOQA_n8KU2eeIZBDwIH0/edit#gid=0
+
 http://heman.readthedocs.org/en/latest/generate.html#archipelagos

14/stereo.frag

@@ -0,0 +1,29 @@
+// Author @patriciogv - 2015
+// http://patriciogonzalezvivo.com
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform sampler2D u_tex0;
+uniform vec2 u_tex0Resolution;
+
+uniform vec2 u_resolution;
+uniform vec2 u_mouse;
+uniform float u_time;
+
+void main () {
+    vec2 st = gl_FragCoord.xy/u_resolution.xy;
+    vec4 color = vec4(0.0);
+
+    st *= vec2(.5,1.);
+
+    // st.x *= u_resolution.x/u_resolution.y;
+    float t = u_time*10.;
+
+    vec4 A = texture2D(u_tex0,st);
+    vec4 B = texture2D(u_tex0,st+vec2(.5,.0));
+
+    color = mix(A, B, abs(sin(t)));
+    gl_FragColor = color;
+}

chap-header.php

@@ -3,7 +3,7 @@
 	echo '
 	<div class="header">
 		<p><a href="http://thebookofshaders.com/">The Book of Shaders</a> by <a href="http://patriciogonzalezvivo.com">Patricio Gonzalez Vivo</a> </p>
-		<p><a href=".">English</a> - <a href="?lan=jp">日本語</a></p>
+		<p><a href=".">English</a> - <a href="?lan=jp">日本語</a> - <a href="?lan=ch">中国的翻译</a> </p>
 	</div>
 	<hr>
 	';