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//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005-2014 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// DESCRIPTION:
// System specific interface stuff.
//
#ifndef __I_VIDEO__
#define __I_VIDEO__
#include "doomtype.h"
// Screen width and height.
#define SCREENWIDTH 320
#define SCREENHEIGHT 200
// Screen width used for "squash" scale functions
#define SCREENWIDTH_4_3 256
// Screen height used for "stretch" scale functions.
#define SCREENHEIGHT_4_3 240
#define MAX_MOUSE_BUTTONS 8
typedef struct
{
// Screen width and height
int width;
int height;
// Initialisation function to call when using this mode.
// Called with a pointer to the Doom palette.
//
// If NULL, no init function is called.
void (*InitMode)(byte *palette);
// Function to call to draw the screen from the source buffer.
// Return true if draw was successful.
boolean (*DrawScreen)(int x1, int y1, int x2, int y2);
// If true, this is a "poor quality" mode. The autoadjust
// code should always attempt to use a different mode to this
// mode in fullscreen.
//
// Some notes about what "poor quality" means in this context:
//
// The aspect ratio correction works by scaling up to the larger
// screen size and then drawing pixels on the edges between the
// "virtual" pixels so that an authentic blocky look-and-feel is
// achieved.
//
// For a mode like 640x480, you can imagine the grid of the
// "original" pixels spaced out, with extra "blurry" pixels added
// in the space between them to fill it out. However, when you're
// running at a resolution like 320x240, this is not the case. In
// the small screen case, every single pixel has to be a blurry
// interpolation of two pixels from the original image.
//
// If you run in 320x240 and put your face up close to the screen
// you can see this: it's particularly visible in the small yellow
// status bar numbers for example. Overall it still looks "okay"
// but there's an obvious - albeit small - deterioration in
// quality.
//
// Once you get to 640x480, all the original pixels are there at
// least once and it's okay (the higher the resolution, the more
// accurate it is). When I first wrote the code I was expecting
// that even higher resolutions would be needed before it would
// look acceptable, but it turned out to be okay even at 640x480.
boolean poor_quality;
} screen_mode_t;
typedef boolean (*grabmouse_callback_t)(void);
// Called by D_DoomMain,
// determines the hardware configuration
// and sets up the video mode
void I_InitGraphics (void);
void I_GraphicsCheckCommandLine(void);
void I_ShutdownGraphics(void);
// Takes full 8 bit values.
void I_SetPalette (byte* palette);
int I_GetPaletteIndex(int r, int g, int b);
void I_UpdateNoBlit (void);
void I_FinishUpdate (void);
void I_ReadScreen (byte* scr);
void I_BeginRead (void);
void I_EndRead (void);
void I_SetWindowTitle(char *title);
void I_CheckIsScreensaver(void);
void I_SetGrabMouseCallback(grabmouse_callback_t func);
void I_DisplayFPSDots(boolean dots_on);
void I_BindVideoVariables(void);
void I_InitWindowTitle(void);
void I_InitWindowIcon(void);
// Called before processing any tics in a frame (just after displaying a frame).
// Time consuming syncronous operations are performed here (joystick reading).
void I_StartFrame (void);
// Called before processing each tic in a frame.
// Quick syncronous operations are performed here.
void I_StartTic (void);
// Enable the loading disk image displayed when reading from disk.
void I_EnableLoadingDisk(void);
extern char *video_driver;
extern boolean screenvisible;
extern float mouse_acceleration;
extern int mouse_threshold;
extern int vanilla_keyboard_mapping;
extern boolean screensaver_mode;
extern int usegamma;
extern byte *I_VideoBuffer;
extern int screen_width;
extern int screen_height;
extern int screen_bpp;
extern int fullscreen;
extern int aspect_ratio_correct;
#endif
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