engine: platform: sdl: slightly rework previous patch to not call SDL each frame and check for NULL pointers

engine/client/vid_common.c

@@ -20,8 +20,6 @@ GNU General Public License for more details.
 #include "vid_common.h"
 #include "platform/platform.h"
 
-static CVAR_DEFINE( window_width, "width", "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "screen width" );
-static CVAR_DEFINE( window_height, "height", "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "screen height" );
 static CVAR_DEFINE_AUTO( vid_mode, "0", FCVAR_RENDERINFO, "current video mode index (used only for storage)" );
 static CVAR_DEFINE_AUTO( vid_rotate, "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "screen rotation (0-3)" );
 static CVAR_DEFINE_AUTO( vid_scale, "1.0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "pixel scale" );
@@ -29,6 +27,8 @@ static CVAR_DEFINE_AUTO( vid_scale, "1.0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "p
 CVAR_DEFINE_AUTO( vid_highdpi, "1",  FCVAR_RENDERINFO|FCVAR_VIDRESTART, "enable High-DPI mode" );
 CVAR_DEFINE_AUTO( vid_maximized, "0", FCVAR_RENDERINFO, "window maximized state, read-only" );
 CVAR_DEFINE( vid_fullscreen, "fullscreen", "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "fullscreen state (0 windowed, 1 fullscreen, 2 borderless)" );
+CVAR_DEFINE( window_width, "width", "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "screen width" );
+CVAR_DEFINE( window_height, "height", "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "screen height" );
 CVAR_DEFINE( window_xpos, "_window_xpos", "-1", FCVAR_RENDERINFO, "window position by horizontal" );
 CVAR_DEFINE( window_ypos, "_window_ypos", "-1", FCVAR_RENDERINFO, "window position by vertical" );
 

engine/client/vid_common.h

@@ -38,6 +38,8 @@ extern glwstate_t glw_state;
 extern convar_t	vid_fullscreen;
 extern convar_t vid_maximized;
 extern convar_t	vid_highdpi;
+extern convar_t window_width;
+extern convar_t window_height;
 extern convar_t window_xpos;
 extern convar_t window_ypos;
 extern convar_t	gl_msaa_samples;

engine/platform/sdl/in_sdl.c

@@ -43,18 +43,19 @@ Platform_GetMousePos
 */
 void GAME_EXPORT Platform_GetMousePos( int *x, int *y )
 {
-    float factorX;
-    float factorY;
-    {
-        int w1, w2, h1, h2;
-        SDL_GL_GetDrawableSize( host.hWnd, &w1, &h1 );
-        SDL_GetWindowSize( host.hWnd, &w2, &h2 );
-        factorX = (float)w1 / w2;
-        factorY = (float)h1 / h2;
-    }
 	SDL_GetMouseState( x, y );
-    *x = *x * factorX;
+
-    *y = *y * factorY;
+	if( x && window_width.value && window_width.value != refState.width )
+	{
+		float factor = refState.width / window_width.value;
+		*x = *x * factor;
+	}
+
+	if( y && window_height.value && window_height.value != refState.height )
+	{
+		float factor = refState.height / window_height.value;
+		*y = *y * factor;
+	}
 }
 
 /*