1.1 --- a/src/drivers/video_gl.c	Mon Jul 14 07:44:42 2008 +0000
     1.2 +++ b/src/drivers/video_gl.c	Tue Sep 09 00:51:43 2008 +0000
     1.3 @@ -51,6 +51,34 @@
     1.4      gl_texture_window( buffer->width, buffer->height, buffer->buf_id, buffer->inverted );
     1.5  }
     1.6  
     1.7 +/**
     1.8 + * Convert window coordinates to dreamcast device coords (640x480) using the 
     1.9 + * same viewable area as gl_texture_window.
    1.10 + * If the coordinates are outside the viewable area, the result is -1,-1.
    1.11 + */ 
    1.12 +void gl_window_to_system_coords( int *x, int *y )
    1.13 +{
    1.14 +    int x1=0,y1=0,x2=video_width,y2=video_height;
    1.15 +
    1.16 +    int ah = video_width * 0.75;
    1.17 +
    1.18 +    if( ah > video_height ) {
    1.19 +        int w = (video_height/0.75);
    1.20 +        x1 = (video_width - w)/2;
    1.21 +        x2 -= x1;
    1.22 +    } else if( ah < video_height ) {
    1.23 +        y1 = (video_height - ah)/2;
    1.24 +        y2 -= y1;
    1.25 +    }
    1.26 +    if( *x < x1 || *x >= x2 || *y < y1 || *y >= y2 ) {
    1.27 +        *x = -1;
    1.28 +        *y = -1;
    1.29 +    } else {
    1.30 +        *x = (*x - x1) * DISPLAY_WIDTH / (x2-x1);
    1.31 +        *y = (*y - y1) * DISPLAY_HEIGHT / (y2-y1);
    1.32 +    }
    1.33 +}
    1.34 +
    1.35  void gl_texture_window( int width, int height, int tex_id, gboolean inverted )
    1.36  {
    1.37      float top, bottom;