aspect ratio

learning/shapes/main.frag

@@ -0,0 +1,21 @@
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform vec2    u_resolution;
+uniform vec2    u_mouse;
+uniform float   u_time;
+
+varying vec2    v_texcoord;
+
+void main(void) {
+    vec4 color = vec4(vec3(0.0), 1.0);
+    vec2 pixel = 1.0/u_resolution.xy;
+    vec2 st = gl_FragCoord.xy * pixel;
+    vec2 uv = v_texcoord;
+
+    color.rgb = vec3(st.x,st.y,abs(sin(u_time)));
+    
+    gl_FragColor = color;
+}