frodo-wii/Src/Display_SDL.i

/*
 *  Display_SDL.i - C64 graphics display, emulator window handling,
 *                  SDL specific stuff
 *
 *  Frodo (C) 1994-1997,2002 Christian Bauer
 */

#include "C64.h"
#include "SAM.h"
#include "Version.h"

#include <SDL.h>


// Display surface
SDL_Surface *screen = NULL;
SDL_Surface *real_screen = NULL;

// Keyboard
static bool num_locked = false;

#if defined(DO_ERROR_BLINK)
// For LED error blinking
static C64Display *c64_disp;
static struct sigaction pulse_sa;
static itimerval pulse_tv;
#endif

// Colors for speedometer/drive LEDs
enum {
	black = 0,
	white = 1,
	fill_gray = 16,
	shine_gray = 17,
	shadow_gray = 18,
	red = 19,
	green = 20,
	PALETTE_SIZE = 21
};

/*
  C64 keyboard matrix:

    Bit 7   6   5   4   3   2   1   0
  0    CUD  F5  F3  F1  F7 CLR RET DEL
  1    SHL  E   S   Z   4   A   W   3
  2     X   T   F   C   6   D   R   5
  3     V   U   H   B   8   G   Y   7
  4     N   O   K   M   0   J   I   9
  5     ,   @   :   .   -   L   P   +
  6     /   ^   =  SHR HOM  ;   *   <EFBFBD>
  7    R/S  Q   C= SPC  2  CTL  <-  1
*/

#define MATRIX(a,b) (((a) << 3) | (b))


/*
 *  Open window
 */

int init_graphics(void)
{
	Uint32 rmask, gmask, bmask, amask;

	/* SDL interprets each pixel as a 32-bit number, so our masks must depend                                                               
           on the endianness (byte order) of the machine */
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
	rmask = 0xff000000;
	gmask = 0x00ff0000;
	bmask = 0x0000ff00;
	amask = 0x000000ff;
#else
     	rmask = 0x000000ff;
	gmask = 0x0000ff00;
	bmask = 0x00ff0000;
	amask = 0xff000000;
#endif

	// Open window
	SDL_WM_SetCaption(VERSION_STRING, "Frodo");
	SDL_ShowCursor(SDL_DISABLE);

	screen = SDL_CreateRGBSurface(SDL_SWSURFACE, DISPLAY_X, DISPLAY_Y + 17, 8,
			rmask, gmask, bmask, amask);
	real_screen = SDL_SetVideoMode(FULL_DISPLAY_X, FULL_DISPLAY_Y, 8,
			SDL_DOUBLEBUF);

	return 1;
}


/*
 *  Display constructor
 */

C64Display::C64Display(C64 *the_c64) : TheC64(the_c64)
{
	quit_requested = false;
	speedometer_string[0] = 0;

	// LEDs off
	for (int i=0; i<4; i++)
		led_state[i] = old_led_state[i] = LED_OFF;

#if defined(DO_ERROR_BLINK)
	// Start timer for LED error blinking
	c64_disp = this;
	pulse_sa.sa_handler = (void (*)(int))pulse_handler;
	pulse_sa.sa_flags = 0;
	sigemptyset(&pulse_sa.sa_mask);
	sigaction(SIGALRM, &pulse_sa, NULL);
	pulse_tv.it_interval.tv_sec = 0;
	pulse_tv.it_interval.tv_usec = 400000;
	pulse_tv.it_value.tv_sec = 0;
	pulse_tv.it_value.tv_usec = 400000;
	setitimer(ITIMER_REAL, &pulse_tv, NULL);
#endif
}


/*
 *  Display destructor
 */

C64Display::~C64Display()
{
	SDL_Quit();
}


/*
 *  Prefs may have changed
 */

void C64Display::NewPrefs(Prefs *prefs)
{
}


/*
 *  Redraw bitmap
 */

void C64Display::Update(void)
{
	// Update display
	SDL_Rect srcrect, dstrect;

	if (ThePrefs.DisplayOption == 0) {
		/* Center, double size */
		srcrect = (SDL_Rect){32, 14, FULL_DISPLAY_X / 2, FULL_DISPLAY_Y / 2};
		dstrect = (SDL_Rect){0, 0, FULL_DISPLAY_X, FULL_DISPLAY_Y};
	}
	else {
		/* Stretch */
		srcrect = (SDL_Rect){0, 0, DISPLAY_X, DISPLAY_Y};
		dstrect = (SDL_Rect){0, 0, FULL_DISPLAY_X, FULL_DISPLAY_Y};
	}
	SDL_SoftStretch(screen, &srcrect, real_screen, &dstrect);                                                                     
	SDL_Flip(real_screen);
}


/*
 *  Draw string into surface using the C64 ROM font
 */

void C64Display::draw_string(SDL_Surface *s, int x, int y, const char *str, uint8 front_color, uint8 back_color)
{
	uint8 *pb = (uint8 *)s->pixels + s->pitch*y + x;
	char c;
	while ((c = *str++) != 0) {
		uint8 *q = TheC64->Char + c*8 + 0x800;
		uint8 *p = pb;
		for (int y=0; y<8; y++) {
			uint8 v = *q++;
			p[0] = (v & 0x80) ? front_color : back_color;
			p[1] = (v & 0x40) ? front_color : back_color;
			p[2] = (v & 0x20) ? front_color : back_color;
			p[3] = (v & 0x10) ? front_color : back_color;
			p[4] = (v & 0x08) ? front_color : back_color;
			p[5] = (v & 0x04) ? front_color : back_color;
			p[6] = (v & 0x02) ? front_color : back_color;
			p[7] = (v & 0x01) ? front_color : back_color;
			p += s->pitch;
		}
		pb += 8;
	}
}


/*
 *  LED error blink
 */

#if defined(DO_ERROR_BLINK)
void C64Display::pulse_handler(...)
{
	for (int i=0; i<4; i++)
		switch (c64_disp->led_state[i]) {
			case LED_ERROR_ON:
				c64_disp->led_state[i] = LED_ERROR_OFF;
				break;
			case LED_ERROR_OFF:
				c64_disp->led_state[i] = LED_ERROR_ON;
				break;
		}
}
#endif


/*
 *  Draw speedometer
 */

void C64Display::Speedometer(int speed)
{
	static int delay = 0;

	if (delay >= 20) {
		delay = 0;
		sprintf(speedometer_string, "%d%%", speed);
	} else
		delay++;
}


/*
 *  Return pointer to bitmap data
 */

uint8 *C64Display::BitmapBase(void)
{
	return (uint8 *)screen->pixels;
}


/*
 *  Return number of bytes per row
 */

int C64Display::BitmapXMod(void)
{
	return screen->pitch;
}

void C64Display::FakeKeyPress(int kc, bool shift, uint8 *CIA_key_matrix,
		uint8 *CIA_rev_matrix)
{
        // Clear matrices                                                                                                                       
        for (int i = 0; i < 8; i ++)
        {
                CIA_key_matrix[i] = 0xFF;
                CIA_rev_matrix[i] = 0xFF;
        }

        if (shift)
        {
                CIA_key_matrix[6] &= 0xef;
                CIA_rev_matrix[4] &= 0xbf;
        }

        if (kc != -1)
        {
                int c64_byte, c64_bit, shifted;
                c64_byte = kc >> 3;
                c64_bit = kc & 7;
                shifted = kc & 128;
                c64_byte &= 7;
                if (shifted)
                {
                        CIA_key_matrix[6] &= 0xef;
                        CIA_rev_matrix[4] &= 0xbf;
                }
                CIA_key_matrix[c64_byte] &= ~(1 << c64_bit);
                CIA_rev_matrix[c64_bit] &= ~(1 << c64_byte);
        }
}

void C64Display::UpdateKeyMatrix(int c64_key, bool key_up, uint8 *key_matrix, uint8 *rev_matrix)
{
	bool shifted = c64_key & 0x80;
	int c64_byte = (c64_key >> 3) & 7;
	int c64_bit = c64_key & 7;

	if (key_up) {
		if (shifted) {
			key_matrix[6] |= 0x10;
			rev_matrix[4] |= 0x40;
		}
		key_matrix[c64_byte] |= (1 << c64_bit);
		rev_matrix[c64_bit] |= (1 << c64_byte);
	} else {
		if (shifted) {
			key_matrix[6] &= 0xef;
			rev_matrix[4] &= 0xbf;
		}
		key_matrix[c64_byte] &= ~(1 << c64_bit);
		rev_matrix[c64_bit] &= ~(1 << c64_byte);
	}
}

/*
 *  Poll the keyboard
 */

void C64Display::TranslateKey(SDLKey key, bool key_up, uint8 *key_matrix, uint8 *rev_matrix, uint8 *joystick)
{
	int c64_key = -1;
	switch (key) {
		case SDLK_a: c64_key = MATRIX(1,2); break;
		case SDLK_b: c64_key = MATRIX(3,4); break;
		case SDLK_c: c64_key = MATRIX(2,4); break;
		case SDLK_d: c64_key = MATRIX(2,2); break;
		case SDLK_e: c64_key = MATRIX(1,6); break;
		case SDLK_f: c64_key = MATRIX(2,5); break;
		case SDLK_g: c64_key = MATRIX(3,2); break;
		case SDLK_h: c64_key = MATRIX(3,5); break;
		case SDLK_i: c64_key = MATRIX(4,1); break;
		case SDLK_j: c64_key = MATRIX(4,2); break;
		case SDLK_k: c64_key = MATRIX(4,5); break;
		case SDLK_l: c64_key = MATRIX(5,2); break;
		case SDLK_m: c64_key = MATRIX(4,4); break;
		case SDLK_n: c64_key = MATRIX(4,7); break;
		case SDLK_o: c64_key = MATRIX(4,6); break;
		case SDLK_p: c64_key = MATRIX(5,1); break;
		case SDLK_q: c64_key = MATRIX(7,6); break;
		case SDLK_r: c64_key = MATRIX(2,1); break;
		case SDLK_s: c64_key = MATRIX(1,5); break;
		case SDLK_t: c64_key = MATRIX(2,6); break;
		case SDLK_u: c64_key = MATRIX(3,6); break;
		case SDLK_v: c64_key = MATRIX(3,7); break;
		case SDLK_w: c64_key = MATRIX(1,1); break;
		case SDLK_x: c64_key = MATRIX(2,7); break;
		case SDLK_y: c64_key = MATRIX(3,1); break;
		case SDLK_z: c64_key = MATRIX(1,4); break;

		case SDLK_0: c64_key = MATRIX(4,3); break;
		case SDLK_1: c64_key = MATRIX(7,0); break;
		case SDLK_2: c64_key = MATRIX(7,3); break;
		case SDLK_3: c64_key = MATRIX(1,0); break;
		case SDLK_4: c64_key = MATRIX(1,3); break;
		case SDLK_5: c64_key = MATRIX(2,0); break;
		case SDLK_6: c64_key = MATRIX(2,3); break;
		case SDLK_7: c64_key = MATRIX(3,0); break;
		case SDLK_8: c64_key = MATRIX(3,3); break;
		case SDLK_9: c64_key = MATRIX(4,0); break;

		case SDLK_SPACE: c64_key = MATRIX(7,4); break;
		case SDLK_BACKQUOTE: c64_key = MATRIX(7,1); break;
		case SDLK_BACKSLASH: c64_key = MATRIX(6,6); break;
		case SDLK_COMMA: c64_key = MATRIX(5,7); break;
		case SDLK_PERIOD: c64_key = MATRIX(5,4); break;
		case SDLK_MINUS: c64_key = MATRIX(5,0); break;
		case SDLK_EQUALS: c64_key = MATRIX(5,3); break;
		case SDLK_LEFTBRACKET: c64_key = MATRIX(5,6); break;
		case SDLK_RIGHTBRACKET: c64_key = MATRIX(6,1); break;
		case SDLK_SEMICOLON: c64_key = MATRIX(5,5); break;
		case SDLK_QUOTE: c64_key = MATRIX(6,2); break;
		case SDLK_SLASH: c64_key = MATRIX(6,7); break;

		case SDLK_ESCAPE: c64_key = MATRIX(7,7); break;
		case SDLK_RETURN: c64_key = MATRIX(0,1); break;
		case SDLK_BACKSPACE: case SDLK_DELETE: c64_key = MATRIX(0,0); break;
		case SDLK_INSERT: c64_key = MATRIX(6,3); break;
		case SDLK_HOME: c64_key = MATRIX(6,3); break;
		case SDLK_END: c64_key = MATRIX(6,0); break;
		case SDLK_PAGEUP: c64_key = MATRIX(6,0); break;
		case SDLK_PAGEDOWN: c64_key = MATRIX(6,5); break;

		case SDLK_LCTRL: case SDLK_TAB: c64_key = MATRIX(7,2); break;
		case SDLK_RCTRL: c64_key = MATRIX(7,5); break;
		case SDLK_LSHIFT: c64_key = MATRIX(1,7); break;
		case SDLK_RSHIFT: c64_key = MATRIX(6,4); break;
		case SDLK_LALT: case SDLK_LMETA: c64_key = MATRIX(7,5); break;
		case SDLK_RALT: case SDLK_RMETA: c64_key = MATRIX(7,5); break;

		case SDLK_UP: c64_key = MATRIX(0,7)| 0x80; break;
		case SDLK_DOWN: c64_key = MATRIX(0,7); break;
		case SDLK_LEFT: c64_key = MATRIX(0,2) | 0x80; break;
		case SDLK_RIGHT: c64_key = MATRIX(0,2); break;

		case SDLK_F1: c64_key = MATRIX(0,4); break;
		case SDLK_F2: c64_key = MATRIX(0,4) | 0x80; break;
		case SDLK_F3: c64_key = MATRIX(0,5); break;
		case SDLK_F4: c64_key = MATRIX(0,5) | 0x80; break;
		case SDLK_F5: c64_key = MATRIX(0,6); break;
		case SDLK_F6: c64_key = MATRIX(0,6) | 0x80; break;
		case SDLK_F7: c64_key = MATRIX(0,3); break;
		case SDLK_F8: c64_key = MATRIX(0,3) | 0x80; break;

		case SDLK_KP0: case SDLK_KP5: c64_key = 0x10 | 0x40; break;
		case SDLK_KP1: c64_key = 0x06 | 0x40; break;
		case SDLK_KP2: c64_key = 0x02 | 0x40; break;
		case SDLK_KP3: c64_key = 0x0a | 0x40; break;
		case SDLK_KP4: c64_key = 0x04 | 0x40; break;
		case SDLK_KP6: c64_key = 0x08 | 0x40; break;
		case SDLK_KP7: c64_key = 0x05 | 0x40; break;
		case SDLK_KP8: c64_key = 0x01 | 0x40; break;
		case SDLK_KP9: c64_key = 0x09 | 0x40; break;

		case SDLK_KP_DIVIDE: c64_key = MATRIX(6,7); break;
		case SDLK_KP_ENTER: c64_key = MATRIX(0,1); break;

		default: break;
	}

	if (c64_key < 0)
		return;

	// Handle joystick emulation
	if (c64_key & 0x40) {
		c64_key &= 0x1f;
		if (key_up)
			*joystick |= c64_key;
		else
			*joystick &= ~c64_key;
		return;
	}

	this->UpdateKeyMatrix(c64_key, key_up, key_matrix, rev_matrix);
}

void C64Display::PollKeyboard(uint8 *key_matrix, uint8 *rev_matrix, uint8 *joystick)
{
	SDL_Event event;
	while (SDL_PollEvent(&event)) {
		switch (event.type) {

			// Key pressed
			case SDL_KEYDOWN:
				switch (event.key.keysym.sym) {

					case SDLK_F9:	// F9: Invoke SAM
						SAM(TheC64);
						break;

					case SDLK_F10:	// F10: Quit
						quit_requested = true;
						break;

					case SDLK_F11:	// F11: NMI (Restore)
						TheC64->NMI();
						break;

					case SDLK_F12:	// F12: Reset
						TheC64->Reset();
						break;

					case SDLK_HOME:	// Home: Pause and enter menu
						TheC64->enter_menu();
						break;

					case SDLK_NUMLOCK:
						num_locked = true;
						break;

					case SDLK_KP_PLUS:	// '+' on keypad: Increase SkipFrames
						ThePrefs.SkipFrames++;
						break;

					case SDLK_KP_MINUS:	// '-' on keypad: Decrease SkipFrames
						if (ThePrefs.SkipFrames > 1)
							ThePrefs.SkipFrames--;
						break;

					case SDLK_KP_MULTIPLY:	// '*' on keypad: Toggle speed limiter
						ThePrefs.LimitSpeed = !ThePrefs.LimitSpeed;
						break;

					default:
						TranslateKey(event.key.keysym.sym, false, key_matrix, rev_matrix, joystick);
						break;
				}
				break;

			// Key released
			case SDL_KEYUP:
				if (event.key.keysym.sym == SDLK_NUMLOCK)
					num_locked = false;
				else
					TranslateKey(event.key.keysym.sym, true, key_matrix, rev_matrix, joystick);
				break;

			// Quit Frodo
			case SDL_QUIT:
				quit_requested = true;
				break;
		}
	}
}


/*
 *  Check if NumLock is down (for switching the joystick keyboard emulation)
 */

bool C64Display::NumLock(void)
{
	return num_locked;
}


/*
 *  Allocate C64 colors
 */

void C64Display::InitColors(uint8 *colors)
{
	SDL_Color palette[PALETTE_SIZE];
	for (int i=0; i<16; i++) {
		palette[i].r = palette_red[i];
		palette[i].g = palette_green[i];
		palette[i].b = palette_blue[i];
	}
	palette[fill_gray].r = palette[fill_gray].g = palette[fill_gray].b = 0xd0;
	palette[shine_gray].r = palette[shine_gray].g = palette[shine_gray].b = 0xf0;
	palette[shadow_gray].r = palette[shadow_gray].g = palette[shadow_gray].b = 0x80;
	palette[red].r = 0xf0;
	palette[red].g = palette[red].b = 0;
	palette[green].g = 0xf0;
	palette[green].r = palette[green].b = 0;
	SDL_SetColors(screen, palette, 0, PALETTE_SIZE);
	SDL_SetColors(real_screen, palette, 0, PALETTE_SIZE);


	for (int i=0; i<256; i++)
		colors[i] = i & 0x0f;
}


/*
 *  Show a requester (error message)
 */

long int ShowRequester(char *a,char *b,char *)
{
	printf("%s: %s\n", a, b);
	return 1;
}