shader updates

src/shaders/default.vert

@@ -1,14 +1,17 @@
-attribute vec4 a_position;
-attribute vec4 a_color;
-attribute vec2 a_texCoord0;
+#version 150
+
+in vec4 a_position;
+in vec4 a_color;
+in vec2 a_texCoord0;
 
 uniform mat4 u_projTrans;
 
-varying vec4 v_color;
-varying vec2 v_texCoords;
+out vec4 v_color;
+out vec2 v_texCoords;
 
 void main() {
     v_color = a_color;
+    v_color.a = v_color.a * (255.0/254.0);
     v_texCoords = a_texCoord0;
     gl_Position = u_projTrans * a_position;
 }