--- a/shaders/crt.v.glsl	Sat May 09 13:15:49 2020 -0700
+++ b/shaders/crt.v.glsl	Sat May 09 21:15:33 2020 -0700
@@ -1,13 +1,13 @@
-#version 110
 
 attribute vec2 pos;
-varying vec2 texcoord;
-varying vec2 screencoord;
-uniform float width, height;
+varying mediump vec2 texcoord;
+varying mediump vec2 screencoord;
+uniform mediump float width, height;
+uniform mediump vec2 texsize;
 
 void main()
 {
 	gl_Position = vec4(pos, 0.0, 1.0);
-	texcoord = sign(pos) * vec2(width/1024.0, height/-1024.0) + vec2(width/1024.0, height/1024.0);
+	texcoord = sign(pos) * vec2(0.5*width/texsize.x, -0.5*height/texsize.y) + vec2(0.5*width/texsize.x, 0.5*height/texsize.y);
 	screencoord = sign(pos);
 }
\ No newline at end of file