redquark-amiberry-rb/src/osdep/amiberry_gfx.cpp

#include "sysconfig.h"
#include "sysdeps.h"
#include "config.h"
#include "uae.h"
#include "options.h"
#include "gui.h"
#include "memory.h"
#include "newcpu.h"
#include "custom.h"
#include "xwin.h"
#include "drawing.h"
#include "inputdevice.h"
#include "savestate.h"
#include "picasso96.h"
#include "amiberry_gfx.h"

#include <png.h>
#include <SDL.h>
#ifdef USE_SDL1
#include <SDL_image.h>
#include <SDL_gfxPrimitives.h>
#include <SDL_ttf.h>
#include "threaddep/thread.h"
#include "bcm_host.h"
#endif

#ifdef ANDROIDSDL
#include <android/log.h>
#endif


/* SDL variable for output of emulation */
SDL_Surface* screen = nullptr;

static unsigned int current_vsync_frame = 0;
unsigned long time_per_frame = 20000; // Default for PAL (50 Hz): 20000 microsecs
static unsigned long last_synctime;
static int vsync_modulo = 1;
static int host_hz = 50;

#ifdef USE_SDL1
/* Dummy SDL variable for screen init */
SDL_Surface *Dummy_prSDLScreen = NULL;
#endif

/* Possible screen modes (x and y resolutions) */
#define MAX_SCREEN_MODES 14
static int x_size_table[MAX_SCREEN_MODES] = {640, 640, 720, 800, 800, 960, 1024, 1280, 1280, 1280, 1360, 1366, 1680, 1920};
static int y_size_table[MAX_SCREEN_MODES] = {400, 480, 400, 480, 600, 540, 768, 720, 800, 1024, 768, 768, 1050, 1080};

struct PicassoResolution* DisplayModes;
struct MultiDisplay Displays[MAX_DISPLAYS];

int screen_is_picasso = 0;

static SDL_Surface* current_screenshot = nullptr;
static char screenshot_filename_default[MAX_DPATH] =
{
	'/', 't', 'm', 'p', '/', 'n', 'u', 'l', 'l', '.', 'p', 'n', 'g', '\0'
};
char* screenshot_filename = static_cast<char *>(&screenshot_filename_default[0]);
FILE* screenshot_file = nullptr;
static void CreateScreenshot();
static int save_thumb(char* path);
int delay_savestate_frame = 0;

static unsigned long next_synctime = 0;

#ifdef USE_SDL1
DISPMANX_DISPLAY_HANDLE_T   dispmanxdisplay;
DISPMANX_MODEINFO_T         dispmanxdinfo;
DISPMANX_RESOURCE_HANDLE_T  dispmanxresource_amigafb_1 = 0;
DISPMANX_RESOURCE_HANDLE_T  dispmanxresource_amigafb_2 = 0;
DISPMANX_ELEMENT_HANDLE_T   dispmanxelement;
DISPMANX_UPDATE_HANDLE_T    dispmanxupdate;
VC_RECT_T       src_rect;
VC_RECT_T       dst_rect;
VC_RECT_T       blit_rect;

static int DispManXElementpresent = 0;
static unsigned char current_resource_amigafb = 0;
#endif

static volatile uae_atomic vsync_counter = 0;
void vsync_callback(unsigned int a, void* b)
{
	atomic_inc(&vsync_counter);
}

int graphics_setup(void)
{
#ifdef PICASSO96
	picasso_InitResolutions();
	InitPicasso96();
#endif
#ifdef USE_SDL1
	VCHI_INSTANCE_T vchi_instance;
	VCHI_CONNECTION_T *vchi_connection;
	TV_DISPLAY_STATE_T tvstate;

	if (vchi_initialise(&vchi_instance) == 0) {
		if (vchi_connect(NULL, 0, vchi_instance) == 0) {
			vc_vchi_tv_init(vchi_instance, &vchi_connection, 1);
			if (vc_tv_get_display_state(&tvstate) == 0) {
				HDMI_PROPERTY_PARAM_T property;
				property.property = HDMI_PROPERTY_PIXEL_CLOCK_TYPE;
				vc_tv_hdmi_get_property(&property);
				float frame_rate = property.param1 == HDMI_PIXEL_CLOCK_TYPE_NTSC ? tvstate.display.hdmi.frame_rate * (1000.0f / 1001.0f) : tvstate.display.hdmi.frame_rate;
				host_hz = int(frame_rate);
			}
			vc_vchi_tv_stop();
			vchi_disconnect(vchi_instance);
		}
	}

	bcm_host_init();
	dispmanxdisplay = vc_dispmanx_display_open(0);
	vc_dispmanx_vsync_callback(dispmanxdisplay, vsync_callback, NULL);
#endif
	return 1;
}

void InitAmigaVidMode(struct uae_prefs* p)
{
	/* Initialize structure for Amiga video modes */
	gfxvidinfo.drawbuffer.pixbytes = screen->format->BytesPerPixel;
	gfxvidinfo.drawbuffer.bufmem = static_cast<uae_u8 *>(screen->pixels);
	gfxvidinfo.drawbuffer.outwidth = p->gfx_size.width;
	gfxvidinfo.drawbuffer.outheight = p->gfx_size.height << p->gfx_vresolution;
	gfxvidinfo.drawbuffer.rowbytes = screen->pitch;
}

void graphics_subshutdown()
{
#ifdef USE_SDL1
	if (DispManXElementpresent == 1)
	{
		DispManXElementpresent = 0;
		dispmanxupdate = vc_dispmanx_update_start(0);
		vc_dispmanx_element_remove(dispmanxupdate, dispmanxelement);
		vc_dispmanx_update_submit_sync(dispmanxupdate);
	}

	if (dispmanxresource_amigafb_1 != 0) {
		vc_dispmanx_resource_delete(dispmanxresource_amigafb_1);
		dispmanxresource_amigafb_1 = 0;
	}
	if (dispmanxresource_amigafb_2 != 0) {
		vc_dispmanx_resource_delete(dispmanxresource_amigafb_2);
		dispmanxresource_amigafb_2 = 0;
	}

	if (screen != nullptr) {
		SDL_FreeSurface(screen);
		screen = nullptr;
	}
#elif USE_SDL2
	if (screen != nullptr)
	{
		SDL_FreeSurface(screen);
		screen = nullptr;
	}
	if (texture != nullptr)
	{
		SDL_DestroyTexture(texture);
	}
#endif
}

#ifdef USE_SDL2
void Create_SDL_Surface(const int width, const int height, const int depth)
{
	screen = SDL_CreateRGBSurface(0, width, height, depth, 0, 0, 0, 0);
	check_error_sdl(screen == nullptr, "Unable to create a surface");
}

void Create_SDL_Texture(const int width, const int height, const int depth)
{
	if (depth == 16) {
		// Initialize SDL Texture for the renderer
		texture = SDL_CreateTexture(renderer,
			SDL_PIXELFORMAT_RGB565, // 16-bit
			SDL_TEXTUREACCESS_STREAMING,
			width,
			height);
	}
	else if (depth == 32)
	{
		texture = SDL_CreateTexture(renderer,
			SDL_PIXELFORMAT_BGRA32, // 32-bit
			SDL_TEXTUREACCESS_STREAMING,
			width,
			height);
	}
	check_error_sdl(texture == nullptr, "Unable to create texture");
}

// Check if the requested Amiga resolution can be displayed with the current Screen mode as a direct multiple
// Based on this we make the decision to use Linear (smooth) or Nearest Neighbor (pixelated) scaling
bool isModeAspectRatioExact(SDL_DisplayMode* mode, const int width, const int height)
{
	if (mode->w % width == 0 && mode->h % height == 0)
		return true;
	return false;
}
#endif

void updatedisplayarea()
{
#ifdef USE_SDL1
	if (current_resource_amigafb == 1)
	{
		current_resource_amigafb = 0;
		vc_dispmanx_resource_write_data(dispmanxresource_amigafb_1,
			VC_IMAGE_RGB565,
			gfxvidinfo.drawbuffer.rowbytes,
			gfxvidinfo.drawbuffer.bufmem,
			&blit_rect);
		dispmanxupdate = vc_dispmanx_update_start(0);
		vc_dispmanx_element_change_source(dispmanxupdate, dispmanxelement, dispmanxresource_amigafb_1);
	}
	else
	{
		current_resource_amigafb = 1;
		vc_dispmanx_resource_write_data(dispmanxresource_amigafb_2,
			VC_IMAGE_RGB565,
			gfxvidinfo.drawbuffer.rowbytes,
			gfxvidinfo.drawbuffer.bufmem,
			&blit_rect);
		dispmanxupdate = vc_dispmanx_update_start(0);
		vc_dispmanx_element_change_source(dispmanxupdate, dispmanxelement, dispmanxresource_amigafb_2);
	}
	vc_dispmanx_update_submit(dispmanxupdate, NULL, NULL);
#elif USE_SDL2
	// Update the texture from the surface
	SDL_UpdateTexture(texture, nullptr, screen->pixels, screen->pitch);
	SDL_RenderClear(renderer);
	// Copy the texture on the renderer
	SDL_RenderCopy(renderer, texture, nullptr, nullptr);
	// Update the window surface (show the renderer)
	SDL_RenderPresent(renderer);
#endif
}

#ifdef USE_SDL1
void open_sdl1_screen(int width, int height)
{
	if (Dummy_prSDLScreen != NULL)
	{ 
	  // y.f. 2016-10-13 : free the previous screen surface every time, 
	  // so we can have fullscreen while running and windowed while in config window.
	  // Apparently, something somewhere is resetting the screen.
		SDL_FreeSurface(Dummy_prSDLScreen);
		Dummy_prSDLScreen = NULL;
	}
	
	if (Dummy_prSDLScreen == NULL)
		Dummy_prSDLScreen = SDL_SetVideoMode(width, height, 16, SDL_SWSURFACE | SDL_FULLSCREEN);

	currprefs.gfx_correct_aspect = changed_prefs.gfx_correct_aspect;
	currprefs.gfx_fullscreen_ratio = changed_prefs.gfx_fullscreen_ratio;

	screen = SDL_CreateRGBSurface(SDL_HWSURFACE, width, height, 16,
		Dummy_prSDLScreen->format->Rmask,	Dummy_prSDLScreen->format->Gmask, Dummy_prSDLScreen->format->Bmask, Dummy_prSDLScreen->format->Amask);

	vc_dispmanx_display_get_info(dispmanxdisplay, &dispmanxdinfo);

	dispmanxresource_amigafb_1 = vc_dispmanx_resource_create(VC_IMAGE_RGB565, width, height, &vc_image_ptr);
	dispmanxresource_amigafb_2 = vc_dispmanx_resource_create(VC_IMAGE_RGB565, width, height, &vc_image_ptr);

	vc_dispmanx_rect_set(&blit_rect, 0, 0, width, height);
	vc_dispmanx_resource_write_data(dispmanxresource_amigafb_1, VC_IMAGE_RGB565, prSDLScreen->pitch, prSDLScreen->pixels, &blit_rect);
	vc_dispmanx_rect_set(&src_rect, 0, 0, width << 16, height << 16);

	// 16/9 to 4/3 ratio adaptation.
	if (currprefs.gfx_correct_aspect == 0)
	{
	  // Fullscreen.
		int scaled_width = dispmanxdinfo.width * currprefs.gfx_fullscreen_ratio / 100;
		int scaled_height = dispmanxdinfo.height * currprefs.gfx_fullscreen_ratio / 100;
		vc_dispmanx_rect_set( &dst_rect, (dispmanxdinfo.width - scaled_width)/2, (dispmanxdinfo.height - scaled_height)/2,
			scaled_width,	scaled_height);
	}
	else
	{
	  // 4/3 shrink.
		int scaled_width = dispmanxdinfo.width * currprefs.gfx_fullscreen_ratio / 100;
		int scaled_height = dispmanxdinfo.height * currprefs.gfx_fullscreen_ratio / 100;
		vc_dispmanx_rect_set( &dst_rect, (dispmanxdinfo.width - scaled_width / 16 * 12)/2, (dispmanxdinfo.height - scaled_height)/2,
			scaled_width/16*12,	scaled_height);
	}

	if (DispManXElementpresent == 0)
	{
		DispManXElementpresent = 1;
		dispmanxupdate = vc_dispmanx_update_start(0);
		dispmanxelement = vc_dispmanx_element_add(dispmanxupdate, dispmanxdisplay,	2,               // layer
			&dst_rect, dispmanxresource_amigafb_1, &src_rect,	DISPMANX_PROTECTION_NONE,	&alpha,
			NULL,             // clamp
			DISPMANX_NO_ROTATE);

		vc_dispmanx_update_submit(dispmanxupdate, NULL, NULL);
	}
}
#endif

static void open_screen(struct uae_prefs* p)
{
	int width;
	int height;
	int depth = 16;

#ifdef USE_SDL1
	VC_DISPMANX_ALPHA_T alpha = {
		DISPMANX_FLAGS_ALPHA_T(DISPMANX_FLAGS_ALPHA_FROM_SOURCE | DISPMANX_FLAGS_ALPHA_FIXED_ALL_PIXELS),
		255, /*alpha 0->255*/
		0
	};

	uint32_t     vc_image_ptr;
	current_resource_amigafb = 0;
	next_synctime = 0;
#endif

#ifdef PICASSO96
	if (screen_is_picasso)
	{
		width = picasso_vidinfo.width ? picasso_vidinfo.width : 640;
		height = picasso_vidinfo.height ? picasso_vidinfo.height : 256;
#ifdef USE_SDL2
		SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear"); // we always use linear for Picasso96 modes
#endif //USE_SDL2
	}
	else
#endif //PICASSO96
	{
		p->gfx_resolution = p->gfx_size.width ? (p->gfx_size.width > 600 ? 1 : 0) : 1;
		width = p->gfx_size.width ? p->gfx_size.width : 640;
		height = p->gfx_size.height ? p->gfx_size.height << p->gfx_vresolution : 256;
		
#ifdef USE_SDL2
		if (p->scaling_method == -1)
		{
			if (isModeAspectRatioExact(&sdlMode, width, height))
				SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "nearest");
			else
				SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
		}
		else if (p->scaling_method == 0)
			SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "nearest");
		else if (p->scaling_method == 1)
			SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
#endif
	}

	graphics_subshutdown();

#ifdef USE_SDL1
	open_sdl1_screen(width, height);
	vsync_counter = 0;
	current_vsync_frame = 2;
#elif USE_SDL2
	Create_SDL_Surface(width, height, depth);

	if (screen_is_picasso)
		SDL_RenderSetLogicalSize(renderer, width, height);
	else
	{
		if (p->gfx_vresolution)
			SDL_RenderSetLogicalSize(renderer, width, height);
		else
			SDL_RenderSetLogicalSize(renderer, width, height*2);
	}
	Create_SDL_Texture(width, height, depth);
	updatedisplayarea();
#endif

	if (screen != nullptr)
	{
		InitAmigaVidMode(p);
		init_row_map();
	}
}

void update_display(struct uae_prefs* p)
{
	SDL_ShowCursor(SDL_DISABLE);
	open_screen(p);
	framecnt = 1; // Don't draw frame before reset done
}

int check_prefs_changed_gfx()
{
	int changed = 0;

	if (currprefs.gfx_size.height != changed_prefs.gfx_size.height ||
		currprefs.gfx_size.width != changed_prefs.gfx_size.width ||
		currprefs.gfx_resolution != changed_prefs.gfx_resolution ||
		currprefs.gfx_vresolution != changed_prefs.gfx_vresolution)
	{
		cfgfile_configuration_change(1);
		currprefs.gfx_size.height = changed_prefs.gfx_size.height;
		currprefs.gfx_size.width = changed_prefs.gfx_size.width;
		currprefs.gfx_resolution = changed_prefs.gfx_resolution;
		currprefs.gfx_vresolution = changed_prefs.gfx_vresolution;
		update_display(&currprefs);
		changed = 1;
	}
	if (currprefs.leds_on_screen != changed_prefs.leds_on_screen)
	{
		currprefs.leds_on_screen = changed_prefs.leds_on_screen;
		changed = 1;
	}
#ifdef PANDORA
	if (currprefs.pandora_hide_idle_led != changed_prefs.pandora_hide_idle_led ||
		currprefs.pandora_vertical_offset != changed_prefs.pandora_vertical_offset)
		{
			currprefs.pandora_hide_idle_led = changed_prefs.pandora_hide_idle_led;
			currprefs.pandora_vertical_offset = changed_prefs.pandora_vertical_offset;
			changed = 1;
		}
#endif //PANDORA
	if (currprefs.chipset_refreshrate != changed_prefs.chipset_refreshrate)
	{
		currprefs.chipset_refreshrate = changed_prefs.chipset_refreshrate;
		init_hz_normal();
		changed = 1;
	}

	currprefs.filesys_limit = changed_prefs.filesys_limit;
	currprefs.harddrive_read_only = changed_prefs.harddrive_read_only;

	if (changed)
		init_custom();

	return changed;
}


int lockscr()
{
	if(SDL_LockSurface(screen)== -1)
		return 0;
	init_row_map();
	return 1;
}


void unlockscr()
{
	SDL_UnlockSurface(screen);
}


void wait_for_vsync()
{
}


bool render_screen(bool immediate)
{
	if (savestate_state == STATE_DOSAVE)
	{
		if (delay_savestate_frame > 0)
			--delay_savestate_frame;
		else
		{
			CreateScreenshot();
			save_thumb(screenshot_filename);
			savestate_state = 0;
		}
	}

	return true;
}

void show_screen(int mode)
{
#ifdef USE_SDL1
	unsigned long start = read_processor_time();

	int wait_till = current_vsync_frame;
	if (vsync_modulo == 1) {
		// Amiga framerate is equal to host framerate
		do
		{
			usleep(10);
			current_vsync_frame = vsync_counter;
		} while (wait_till >= current_vsync_frame && read_processor_time() - start < 40000);

		if (wait_till + 1 != current_vsync_frame) {
			// We missed a vsync...
			next_synctime = 0;
		}
	}
	else {
		// Amiga framerate differs from host framerate
		unsigned long wait_till_time = (next_synctime != 0) ? next_synctime : last_synctime + time_per_frame;
		if (current_vsync_frame % vsync_modulo == 0) {
			// Real vsync
			if (start < wait_till_time) {
				// We are in time, wait for vsync
				atomic_set(&vsync_counter, current_vsync_frame);
				do
				{
					usleep(10);
					current_vsync_frame = vsync_counter;
				} while (wait_till >= current_vsync_frame && read_processor_time() - start < 40000);
			}
			else {
				// Too late for vsync
			}
		}
		else {
			// Estimate vsync by time
			while (wait_till_time > read_processor_time()) {
				usleep(10);
			}
			++current_vsync_frame;
		}
	}

	current_vsync_frame += currprefs.gfx_framerate;
#endif

	last_synctime = read_processor_time();

	updatedisplayarea();

#ifdef USE_SDL1
	idletime += last_synctime - start;
#endif

	if (last_synctime - next_synctime > time_per_frame - 5000)
		next_synctime = last_synctime + time_per_frame * (1 + currprefs.gfx_framerate);
	else
		next_synctime = next_synctime + time_per_frame * (1 + currprefs.gfx_framerate);
}

unsigned long target_lastsynctime(void)
{
	return last_synctime;
}

bool show_screen_maybe(bool show)
{
	if (show)
		show_screen(0);
	return false;
}

#ifdef USE_SDL1
void black_screen_now(void)
{
	if (screen != NULL) {
		SDL_FillRect(screen, NULL, 0);
		render_screen(true);
		show_screen(0);
	}
}
#endif

static void graphics_subinit()
{
	if (screen == nullptr)
	{
		open_screen(&currprefs);
		if (screen == nullptr)
			fprintf(stderr, "Unable to set video mode: %s\n", SDL_GetError());
	}
	else
	{
		SDL_ShowCursor(SDL_DISABLE);
		InitAmigaVidMode(&currprefs);
	}
}

STATIC_INLINE int bitsInMask(unsigned long mask)
{
	/* count bits in mask */
	int n = 0;
	while (mask)
	{
		n += mask & 1;
		mask >>= 1;
	}
	return n;
}

STATIC_INLINE int maskShift(unsigned long mask)
{
	/* determine how far mask is shifted */
	int n = 0;
	while (!(mask & 1))
	{
		n++;
		mask >>= 1;
	}
	return n;
}

static int init_colors()
{
	/* Truecolor: */
	int red_bits = bitsInMask(screen->format->Rmask);
	int green_bits = bitsInMask(screen->format->Gmask);
	int blue_bits = bitsInMask(screen->format->Bmask);
	int red_shift = maskShift(screen->format->Rmask);
	int green_shift = maskShift(screen->format->Gmask);
	int blue_shift = maskShift(screen->format->Bmask);
	alloc_colors64k(red_bits, green_bits, blue_bits, red_shift, green_shift, blue_shift, 0);
	notice_new_xcolors();

	return 1;
}

/*
 * Find the colour depth of the display
 */
static int get_display_depth()
{
#ifdef USE_SDL1
	const SDL_VideoInfo *vid_info;
	int depth = 0;

	if ((vid_info = SDL_GetVideoInfo())) {
		depth = vid_info->vfmt->BitsPerPixel;

		/* Don't trust the answer if it's 16 bits; the display
		* could actually be 15 bits deep. We'll count the bits
		* ourselves */
		if (depth == 16)
			depth = bitsInMask(vid_info->vfmt->Rmask) + bitsInMask(vid_info->vfmt->Gmask) + bitsInMask(vid_info->vfmt->Bmask);
	}
#elif USE_SDL2
	int depth = screen->format->BytesPerPixel == 4 ? 32 : 16;
#endif
	return depth;
}

int GetSurfacePixelFormat()
{
	int depth = get_display_depth();
	int unit = depth + 1 & 0xF8;

	return (unit == 8 ? RGBFB_CHUNKY
		        : depth == 15 && unit == 16 ? RGBFB_R5G5B5
		        : depth == 16 && unit == 16 ? RGBFB_R5G6B5
		        : unit == 24 ? RGBFB_B8G8R8
		        : unit == 32 ? RGBFB_R8G8B8A8
		        : RGBFB_NONE);
}

int graphics_init(bool mousecapture)
{
	graphics_subinit();

	if (!init_colors())
		return 0;

	return 1;
}

void graphics_leave()
{
	graphics_subshutdown();

#ifdef USE_SDL1
	if (Dummy_prSDLScreen != NULL) {
		SDL_FreeSurface(Dummy_prSDLScreen);
		Dummy_prSDLScreen = NULL;
	}
	vc_dispmanx_vsync_callback(dispmanxdisplay, NULL, NULL);
	vc_dispmanx_display_close(dispmanxdisplay);
	bcm_host_deinit();
#elif USE_SDL2
	SDL_DestroyRenderer(renderer);
	SDL_DestroyWindow(sdlWindow);
#endif
	SDL_VideoQuit();
}

#define  systemRedShift      (screen->format->Rshift)
#define  systemGreenShift    (screen->format->Gshift)
#define  systemBlueShift     (screen->format->Bshift)
#define  systemRedMask       (screen->format->Rmask)
#define  systemGreenMask     (screen->format->Gmask)
#define  systemBlueMask      (screen->format->Bmask)

static int save_png(SDL_Surface* surface, char* path)
{
	int w = surface->w;
	int h = surface->h;
	unsigned char* pix = static_cast<unsigned char *>(surface->pixels);
	unsigned char writeBuffer[1024 * 3];
	FILE* f = fopen(path, "wb");
	if (!f) return 0;
	png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
	                                                                   nullptr,
	                                                                   nullptr,
	                                                                   nullptr);
	if (!png_ptr)
	{
		fclose(f);
		return 0;
	}

	png_infop info_ptr = png_create_info_struct(png_ptr);

	if (!info_ptr)
	{
		png_destroy_write_struct(&png_ptr,NULL);
		fclose(f);
		return 0;
	}

	png_init_io(png_ptr, f);

	png_set_IHDR(png_ptr,
	             info_ptr,
	             w,
	             h,
	             8,
	             PNG_COLOR_TYPE_RGB,
	             PNG_INTERLACE_NONE,
	             PNG_COMPRESSION_TYPE_DEFAULT,
	             PNG_FILTER_TYPE_DEFAULT);

	png_write_info(png_ptr, info_ptr);

	unsigned char* b = writeBuffer;

	int sizeX = w;
	int sizeY = h;
	int y;
	int x;

	unsigned short* p = reinterpret_cast<unsigned short *>(pix);
	for (y = 0; y < sizeY; y++)
	{
		for (x = 0; x < sizeX; x++)
		{
			unsigned short v = p[x];

			*b++ = ((v & systemRedMask) >> systemRedShift) << 3; // R
			*b++ = ((v & systemGreenMask) >> systemGreenShift) << 2; // G
			*b++ = ((v & systemBlueMask) >> systemBlueShift) << 3; // B
		}
		p += surface->pitch / 2;
		png_write_row(png_ptr, writeBuffer);
		b = writeBuffer;
	}

	png_write_end(png_ptr, info_ptr);

	png_destroy_write_struct(&png_ptr, &info_ptr);

	fclose(f);
	return 1;
}

static void CreateScreenshot()
{
	if (current_screenshot != nullptr)
	{
		SDL_FreeSurface(current_screenshot);
		current_screenshot = nullptr;
	}

	int w = screen->w;
	int h = screen->h;
	current_screenshot = SDL_CreateRGBSurfaceFrom(screen->pixels,
	                                              w,
	                                              h,
	                                              screen->format->BitsPerPixel,
	                                              screen->pitch,
	                                              screen->format->Rmask,
	                                              screen->format->Gmask,
	                                              screen->format->Bmask,
	                                              screen->format->Amask);
}

static int save_thumb(char* path)
{
	int ret = 0;
	if (current_screenshot != nullptr)
	{
		ret = save_png(current_screenshot, path);
		SDL_FreeSurface(current_screenshot);
		current_screenshot = nullptr;
	}
	return ret;
}

bool vsync_switchmode(int hz)
{
	int changed_height = changed_prefs.gfx_size.height;
		
	if (hz >= 55)
		hz = 60;
	else
		hz = 50;
	
	if (hz == 50 && currVSyncRate == 60)
	{
		// Switch from NTSC -> PAL
		switch (changed_height) {
		case 200: changed_height = 240; break;
		case 216: changed_height = 262; break;
		case 240: changed_height = 270; break;
		case 256: changed_height = 270; break;
		case 262: changed_height = 270; break;
		case 270: changed_height = 270; break;
		}
	}
	else if (hz == 60 && currVSyncRate == 50)
	{
		// Switch from PAL -> NTSC
		switch (changed_height) {
		case 200: changed_height = 200; break;
		case 216: changed_height = 200; break;
		case 240: changed_height = 200; break;
		case 256: changed_height = 216; break;
		case 262: changed_height = 216; break;
		case 270: changed_height = 240; break;
		}
	}
 
	if (hz != currVSyncRate)
	{
		SetVSyncRate(hz);
#ifdef USE_SDL1
		black_screen_now();
#endif
		fpscounter_reset();
		time_per_frame = 1000 * 1000 / (hz);
		if (hz == host_hz)
			vsync_modulo = 1;
		else if (hz > host_hz)
			vsync_modulo = 6; // Amiga draws 6 frames while host has 5 vsyncs -> sync every 6th Amiga frame
		else
			vsync_modulo = 5; // Amiga draws 5 frames while host has 6 vsyncs -> sync every 5th Amiga frame
	}

	if (!picasso_on && !picasso_requested_on)
		changed_prefs.gfx_size.height = changed_height;

	return true;
}

bool target_graphics_buffer_update()
{
	bool rate_changed = false;

	if (currprefs.gfx_size.height != changed_prefs.gfx_size.height)
	{
		update_display(&changed_prefs);
		rate_changed = true;
	}

	if (rate_changed)
	{
#ifdef USE_SDL1
		black_screen_now();
#endif
		fpscounter_reset();
		time_per_frame = 1000 * 1000 / currprefs.chipset_refreshrate;
	}

	return true;
}

#ifdef PICASSO96

int picasso_palette(struct MyCLUTEntry *CLUT)
{
	int changed = 0;
	for (int i = 0; i < 256; i++) {
		int r = CLUT[i].Red;
		int g = CLUT[i].Green;
		int b = CLUT[i].Blue;
		uae_u32 v = CONVERT_RGB(r << 16 | g << 8 | b);
		if (v != picasso_vidinfo.clut[i]) {
			picasso_vidinfo.clut[i] = v;
			changed = 1;
		}
	}
	return changed;
}

static int resolution_compare(const void* a, const void* b)
{
	struct PicassoResolution* ma = (struct PicassoResolution *)a;
	struct PicassoResolution* mb = (struct PicassoResolution *)b;
	if (ma->res.width < mb->res.width)
		return -1;
	if (ma->res.width > mb->res.width)
		return 1;
	if (ma->res.height < mb->res.height)
		return -1;
	if (ma->res.height > mb->res.height)
		return 1;
	return ma->depth - mb->depth;
}

static void sortmodes()
{
	int i = 0, idx = -1;
	int pw = -1, ph = -1;
	while (DisplayModes[i].depth >= 0)
		i++;
	qsort(DisplayModes, i, sizeof (struct PicassoResolution), resolution_compare);
	for (i = 0; DisplayModes[i].depth >= 0; i++)
	{
		if (DisplayModes[i].res.height != ph || DisplayModes[i].res.width != pw)
		{
			ph = DisplayModes[i].res.height;
			pw = DisplayModes[i].res.width;
			idx++;
		}
		DisplayModes[i].residx = idx;
	}
}

static void modesList()
{
	int i, j;

	i = 0;
	while (DisplayModes[i].depth >= 0)
	{
		write_log ("%d: %s (", i, DisplayModes[i].name);
		j = 0;
		while (DisplayModes[i].refresh[j] > 0)
		{
			if (j > 0)
			write_log (",");
			write_log ("%d", DisplayModes[i].refresh[j]);
			j++;
		}
		write_log (")\n");
		i++;
	}
}

void picasso_InitResolutions()
{
	int count = 0;
	char tmp[200];
	int bits[] = {8, 16, 32};

	Displays[0].primary = 1;
	Displays[0].disabled = 0;
	Displays[0].rect.left = 0;
	Displays[0].rect.top = 0;
	Displays[0].rect.right = 800;
	Displays[0].rect.bottom = 480;
	sprintf(tmp, "%s (%d*%d)", "Display", Displays[0].rect.right, Displays[0].rect.bottom);
	Displays[0].name = my_strdup(tmp);
	Displays[0].name2 = my_strdup("Display");

	struct MultiDisplay * md1 = Displays;
	DisplayModes = md1->DisplayModes = xmalloc (struct PicassoResolution, MAX_PICASSO_MODES);
	for (int i = 0; i < MAX_SCREEN_MODES && count < MAX_PICASSO_MODES; i++)
	{
		for (int bit_idx = 0; bit_idx < 3; ++bit_idx)
		{
			int bitdepth = bits[bit_idx];
			int bit_unit = (bitdepth + 1) & 0xF8;
			int rgbFormat = (bitdepth == 8 ? RGBFB_CLUT : (bitdepth == 16 ? RGBFB_R5G6B5 : RGBFB_R8G8B8A8));
			int pixelFormat = 1 << rgbFormat;
			pixelFormat |= RGBFF_CHUNKY;

			DisplayModes[count].res.width = x_size_table[i];
			DisplayModes[count].res.height = y_size_table[i];
			DisplayModes[count].depth = bit_unit >> 3;
			DisplayModes[count].refresh[0] = 50;
			DisplayModes[count].refresh[1] = 60;
			DisplayModes[count].refresh[2] = 0;
			DisplayModes[count].colormodes = pixelFormat;
			sprintf(DisplayModes[count].name, "%dx%d, %d-bit",
			        DisplayModes[count].res.width, DisplayModes[count].res.height, DisplayModes[count].depth * 8);

			count++;
		}
	}
	DisplayModes[count].depth = -1;
	sortmodes();
	modesList();
	DisplayModes = Displays[0].DisplayModes;
}
#endif

#ifdef PICASSO96
void gfx_set_picasso_state(int on)
{
	if (on == screen_is_picasso)
		return;

	screen_is_picasso = on;
	open_screen(&currprefs);
	picasso_vidinfo.rowbytes = screen->pitch;
}

void gfx_set_picasso_modeinfo(uae_u32 w, uae_u32 h, uae_u32 depth, RGBFTYPE rgbfmt)
{
	depth >>= 3;
	if (unsigned(picasso_vidinfo.width) == w &&
		unsigned(picasso_vidinfo.height) == h &&
		unsigned(picasso_vidinfo.depth) == depth &&
		picasso_vidinfo.selected_rgbformat == rgbfmt)
		return;

	picasso_vidinfo.selected_rgbformat = rgbfmt;
	picasso_vidinfo.width = w;
	picasso_vidinfo.height = h;
	picasso_vidinfo.depth = screen->format->BytesPerPixel; // Native depth
	picasso_vidinfo.extra_mem = 1;

	picasso_vidinfo.pixbytes = screen->format->BytesPerPixel; // Native bytes
	if (screen_is_picasso)
	{
		open_screen(&currprefs);
		picasso_vidinfo.rowbytes = screen->pitch;
		picasso_vidinfo.rgbformat = screen->format->BytesPerPixel == 4 ? RGBFB_R8G8B8A8 : RGBFB_R5G6B5;
	}
}

uae_u8* gfx_lock_picasso()
{
	if (screen == nullptr || screen_is_picasso == 0)
		return nullptr;
	SDL_LockSurface(screen);
	picasso_vidinfo.rowbytes = screen->pitch;
	return static_cast<uae_u8 *>(screen->pixels);
}

void gfx_unlock_picasso(bool dorender)
{
	SDL_UnlockSurface(screen);
	if (dorender)
	{
		render_screen(true);
		show_screen(0);
	}
}

#endif // PICASSO96