Larger debug text for retina display (#3109)

* Add Init.Resolution.scaleDebug

* clamp scale to BGFX_CONFIG_MAX_SCALE_DEBUG

* update version

* Use textWdith/textHeight in helloworld

include/bgfx/bgfx.h

@@ -647,6 +647,7 @@ namespace bgfx
 		uint32_t reset;             //!< Reset parameters.
 		uint8_t  numBackBuffers;    //!< Number of back buffers.
 		uint8_t  maxFrameLatency;   //!< Maximum frame latency.
+		uint8_t  scaleDebug;        //!< Scale factor for debug view.
 	};
 
 	/// Initialization parameters used by `bgfx::init`.

include/bgfx/c99/bgfx.h

@@ -639,6 +639,7 @@ typedef struct bgfx_resolution_s
     uint32_t             reset;              /** Reset parameters.                        */
     uint8_t              numBackBuffers;     /** Number of back buffers.                  */
     uint8_t              maxFrameLatency;    /** Maximum frame latency.                   */
+    uint8_t              scaleDebug;         /** Scale factor for debug view.             */
 
 } bgfx_resolution_t;
 

include/bgfx/defines.h

@@ -15,7 +15,7 @@
 #ifndef BGFX_DEFINES_H_HEADER_GUARD
 #define BGFX_DEFINES_H_HEADER_GUARD
 
-#define BGFX_API_VERSION UINT32_C(118)
+#define BGFX_API_VERSION UINT32_C(119)
 
 /**
  * Color RGB/alpha/depth write. When it's not specified write will be disabled.