Source to src/video.c


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/*
  video.c

  This file is distributed under the GNU Public License, version 2 or at
  your option any later version. Read the file gpl.txt for details.

*/
const char Video_fileid[] = "Previous video.c : " __DATE__ " " __TIME__;

#include <stdbool.h>
#include <SDL_endian.h>

#include "configuration.h"
#include "cycInt.h"
#include "ioMem.h"
#include "m68000.h"
#include "screen.h"
#include "shortcut.h"
#include "nextMemory.h"
#include "video.h"
#include "dma.h"
#include "sysReg.h"
#include "tmc.h"
#include "nd_sdl.h"

/*--------------------------------------------------------------*/
/* Local functions prototypes                                   */
/*--------------------------------------------------------------*/


/*-----------------------------------------------------------------------*/
/**
 * Reset video chip
 */
void Video_Reset(void) {
	Video_StartInterrupts(0);
    nd_start_interrupts();
}

#define NEXT_VBL_FREQ 68

/**
 * Start VBL interrupt
 */
void Video_StartInterrupts ( int PendingCyclesOver ) {
    CycInt_AddRelativeInterruptUs((1000*1000)/NEXT_VBL_FREQ, INTERRUPT_VIDEO_VBL);
}

/**
 * Generate vertical video retrace interrupt
 */
static void Video_InterruptHandler(void) {
	if (ConfigureParams.System.bTurbo) {
		tmc_video_interrupt();
	} else if (ConfigureParams.System.bColor) {
        color_video_interrupt();
    } else {
        dma_video_interrupt();
    }
}


/*-----------------------------------------------------------------------*/
/**
 * VBL interrupt : set new interrupts, draw screen, generate sound,
 * reset counters, ...
 */
static bool statusBarToggle;
void Video_InterruptHandler_VBL ( void ) {
	CycInt_AcknowledgeInterrupt();
    host_blank(0, MAIN_DISPLAY, true);
    if(statusBarToggle) Update_StatusBar();
    statusBarToggle = !statusBarToggle;
    Video_InterruptHandler();
    CycInt_AddRelativeInterruptUs((1000*1000)/NEXT_VBL_FREQ, INTERRUPT_VIDEO_VBL);
}