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#include "mattise.h"

// gui code...

unsigned char* VGA = (unsigned char*) 0x000A0000;
unsigned char *dbl_buffer;
mBlock dbl_buffer_info;

typedef struct tagBITMAP              /* the structure for a bitmap. */
{
	unsigned int width;
	unsigned int height;
	unsigned char *data;
} BITMAP;

typedef struct tagRECT
{
	long x1;
	long y1;
	long x2;
	long y2;
} RECT;

void init_dbl_buffer(void)
{
	dbl_buffer = (unsigned char *) malloc_count( &dbl_buffer_info, 64 );
	// special - make it red if there aren't enough blocks
	if( dbl_buffer_info.count < 64 )
	{
		int i;
		for( i = 0; i < 64000; i++ )
			*VGA++ = 0x1;
	}
	if( dbl_buffer == (unsigned char*) NULL )
	{
		int i;
		for( i = 0; i < 64000; i++ )
			*VGA++ = 0x4;
		kputs("Not enough memory for double buffer.\n");
		getch();
	}
}

void update_screen(void)
{
	#ifdef VERTICAL_RETRACE
		while ((inportb(0x3DA) & 0x08));
		while (!(inportb(0x3DA) & 0x08));
	#endif
	int i;
	for( i = 0; i < (SCREEN_WIDTH * SCREEN_HEIGHT); i++ )
		VGA[i] = dbl_buffer[i];
//	memcpy( VGA, dbl_buffer, (unsigned int)(SCREEN_WIDTH * SCREEN_HEIGHT) );
}

void setpixel (BITMAP *bmp, int x, int y, unsigned char color)
{
	bmp->data[ ( y * bmp->width ) + x ] = color;
}

/* Draws a filled in rectangle IN A BITMAP. To fill a full bitmap call as
drawrect (&bmp, 0, 0, bmp.width, bmp.height, color); */
void drawrect(BITMAP *bmp, unsigned short x, unsigned short y,
                     unsigned short x2, unsigned short y2,
                     unsigned char color)
{
	unsigned short tx, ty;
	for (ty = y; ty < y2; ty++)
		for (tx = x; tx < x2; tx++)
			setpixel( bmp, tx, ty, color );
}

void draw_bitmap_old(BITMAP *bmp, int x, int y)
{
	int j;
	unsigned int screen_offset = (y << 8) + (y << 6) + x;
	unsigned int bitmap_offset = 0;

	for(j = 0; j < bmp->height; j++)
    	{
		memcpy( &dbl_buffer[screen_offset], &bmp->data[bitmap_offset], bmp->width );

		bitmap_offset += bmp->width;
		screen_offset += SCREEN_WIDTH;
	}
}

void RunGUI()
{
	init_dbl_buffer();
	unsigned char key;
	mBlock test_dat;
	do
	{
		//key = 0;
		//if (kbhit()) key = getch();

		/* You must clear the double buffer every time to avoid evil messes
		(go ahead and try without this, you will see) */
		memset_c( dbl_buffer, 0x0, SCREEN_WIDTH * SCREEN_HEIGHT );

		/* DRAW ALL BITMAPS AND DO GUI CODE HERE */

		BITMAP test;
		test.width = 100;
		test.height = 100;
		test.data = (unsigned char*) malloc( &test_dat );

		drawrect( &test, 0, 0, test.width, test.height, 0x1 );

		draw_bitmap_old( &test, 5, 5 );

		/* Draws the double buffer */
		update_screen();

		// free memory here
		free( test.data, test_dat );

		sleep( 100 );
	}
	while ( true );	/* keep going */
}

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*(unsigned char*)( 0x000A0000 + ( x + ( y * SCREEN_WIDTH ) ) ) = color;

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unsigned char *VGA = (unsigned char *)0xA0000L;