Support for integer vertical scale.

MiSTer.ini

@@ -6,7 +6,8 @@ composite_sync=0       ; set to 1 for composite sync on HSync signal of VGA outp
 vga_scaler=0           ; set to 1 to connect VGA to scaler output.
 hdmi_audio_96k=0       ; set to 1 for 96khz/16bit HDMI audio (48khz/16bit otherwise)
 keyrah_mode=0x18d80002 ; VIDPID of keyrah for special code translation (0x23418037 for Arduino Micro)
-volumectl=1            ; enable audio volume control by multimedia keys
+volumectl=0            ; enable audio volume control by multimedia keys
+vscale_integer=0       ; set to 1 to use only integer vertical scaling
 ;bootscreen=0          ; uncomment to disable boot screen of some cores like Minimig. 
 ;mouse_throttle=10     ; 1-100 mouse speed divisor. Useful for very sensitive mouses
 

cfg.cpp

@@ -40,6 +40,7 @@ const ini_var_t ini_vars[] = {
 	{ "MOUSE_THROTTLE", (void*)(&(cfg.mouse_throttle)), UINT8, 1, 100, 1 },
 	{ "BOOTSCREEN", (void*)(&(cfg.bootscreen)), UINT8, 0, 1, 1 },
 	{ "VOLUMECTL", (void*)(&(cfg.volumectl)), UINT8, 0, 1, 1 },
+	{ "VSCALE_INTEGER", (void*)(&(cfg.vscale_integer)), UINT8, 0, 1, 1 },
 };
 
 // mist ini config

cfg.h

@@ -29,6 +29,7 @@ typedef struct {
 	uint8_t mouse_throttle;
 	uint8_t bootscreen;
 	uint8_t volumectl;
+	uint8_t vscale_integer;
 	char video_conf[1024];
 } cfg_t;
 

user_io.cpp

@@ -2750,6 +2750,18 @@ static uint32_t show_video_info(int force)
 			Info(str, cfg.video_info * 1000);
 		}
 
+		if (cfg.vscale_integer && height && (height <= vitems[5]))
+		{
+			uint32_t mag = vitems[5] / height;
+			height *= mag;
+			printf("Set Integer V scaling: %d\n", height);
+			spi_uio_cmd16(UIO_SETHEIGHT, height);
+		}
+		else
+		{
+			spi_uio_cmd16(UIO_SETHEIGHT, 0);
+		}
+
 		if (vtime && vtimeh) return vtime;
 	}
 	else