fix(emu): resolve double free with main mem ptr

src/shader/pixelbuf.vert

@@ -2,7 +2,7 @@
 out vec2 uv;
 
 const vec2 pos[3] = vec2[3](vec2(-1.0f, -1.0f), vec2(-1.0f, 3.0f), vec2(3.0f, -1.0f));
-const vec2 uvs[3] = vec2[3](vec2( 0.0f,  0.0f), vec2( 0.0f, 2.0f), vec2(2.0f,  0.0f));
+const vec2 uvs[3] = vec2[3](vec2( 2.0f,  2.0f), vec2( 2.0f, 0.0f), vec2(0.0f,  2.0f));
 
 void main() {
 	uv = uvs[gl_VertexID];

src/ui/imgui.zig

@@ -32,8 +32,8 @@ pub fn draw(state: *const State, top_tex: GLuint, btm_tex: GLuint, arm946es: *Ar
         _ = zgui.begin(window_title, .{ .flags = .{ .no_resize = true, .always_auto_resize = true } });
         defer zgui.end();
 
-        zgui.image(@ptrFromInt(top_tex), .{ .w = w, .h = h });
-        zgui.image(@ptrFromInt(btm_tex), .{ .w = w, .h = h });
+        zgui.image(@ptrFromInt(top_tex), .{ .w = w, .h = h, .uv0 = .{ 0, 1 }, .uv1 = .{ 1, 0 } });
+        zgui.image(@ptrFromInt(btm_tex), .{ .w = w, .h = h, .uv0 = .{ 0, 1 }, .uv1 = .{ 1, 0 } });
     }
 
     return true;