(#48) Make it zoom towards the center of the screen

src/vert.glsl

@@ -11,8 +11,8 @@ uniform vec2 cursorPos;
 
 vec3 to_world(vec3 v) {
     vec2 ratio = vec2(
-        windowSize.x / screenshotSize.x,
-        windowSize.y / screenshotSize.y);
+        windowSize.x / screenshotSize.x / cameraScale,
+        windowSize.y / screenshotSize.y / cameraScale);
     return vec3((v.x / screenshotSize.x * 2.0 - 1.0) / ratio.x,
                 (v.y / screenshotSize.y * 2.0 - 1.0) / ratio.y,
                 v.z);
@@ -20,6 +20,6 @@ vec3 to_world(vec3 v) {
 
 void main()
 {
-	gl_Position = vec4(to_world((aPos - vec3(cameraPos * vec2(1.0, -1.0), 0.0)) * cameraScale), 1.0);
+	gl_Position = vec4(to_world((aPos - vec3(cameraPos * vec2(1.0, -1.0), 0.0))), 1.0);
 	texcoord = aTexCoord;
 }