Refactor preloading/rendering/update

shader/texture/bloomBlur.frag

@@ -6,8 +6,9 @@ const vec2 winSize = vec2 (300.0,300.0);
 // this is so that the window size can be extracted and the shader recompiled on
 // the fly
 layout (binding = 0) uniform sampler2D screenTexture;
-const float hOff = 3 / winSize.x;
-const float vOff = 3 / winSize.y;
+// the 1.5 maximises the blend, so to speak
+const float hOff = 1.5 / winSize.x;
+const float vOff = 1.5 / winSize.y;
 //const vec2 off[9] = vec2[]
 //    ( vec2( hOff, vOff )
 //    , vec2( hOff,  0.0 )