diff --git a/source/common/jshader.cpp b/source/common/jshader.cpp
index dc70fe3..1243543 100644
--- a/source/common/jshader.cpp
+++ b/source/common/jshader.cpp
@@ -23,8 +23,8 @@ namespace shader
     SDL_Renderer *renderer = nullptr;
     GLuint programId = 0;
     SDL_Texture* backBuffer = nullptr;
-    SDL_Point win_size = {640, 480};
-    SDL_Point tex_size = {320, 240};
+    SDL_Point win_size = {320*4, 256*4};
+    SDL_Point tex_size = {320, 256};
     bool usingOpenGL;
 
     #ifndef __APPLE__