ref: f794c7692bac019f9f91cc821382a3f2d3b1011d
dir: /src/i_video.c/
//
// 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:
// DOOM graphics stuff for SDL.
//
#include "SDL.h"
#include <stdlib.h>
#include <ctype.h>
#include <math.h>
#include <string.h>
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
#include "icon.c"
#include "config.h"
#include "deh_str.h"
#include "doomtype.h"
#include "doomkeys.h"
#include "i_joystick.h"
#include "i_system.h"
#include "i_swap.h"
#include "i_timer.h"
#include "i_video.h"
#include "m_argv.h"
#include "m_config.h"
#include "m_misc.h"
#include "tables.h"
#include "v_diskicon.h"
#include "v_video.h"
#include "w_wad.h"
#include "z_zone.h"
static const int scancode_translate_table[] = SCANCODE_TO_KEYS_ARRAY;
// Lookup table for mapping ASCII characters to their equivalent when
// shift is pressed on an American layout keyboard:
static const char shiftxform[] =
{
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
31, ' ', '!', '"', '#', '$', '%', '&',
'"', // shift-'
'(', ')', '*', '+',
'<', // shift-,
'_', // shift--
'>', // shift-.
'?', // shift-/
')', // shift-0
'!', // shift-1
'@', // shift-2
'#', // shift-3
'$', // shift-4
'%', // shift-5
'^', // shift-6
'&', // shift-7
'*', // shift-8
'(', // shift-9
':',
':', // shift-;
'<',
'+', // shift-=
'>', '?', '@',
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'[', // shift-[
'!', // shift-backslash - OH MY GOD DOES WATCOM SUCK
']', // shift-]
'"', '_',
'\'', // shift-`
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'{', '|', '}', '~', 127
};
// SDL video driver name
char *video_driver = "";
// Window position:
static char *window_position = "";
// These are (1) the window (or the full screen) that our game is rendered to
// and (2) the renderer that scales the texture (see below) into this window.
static SDL_Window *screen;
static SDL_Renderer *renderer;
// Window title
static char *window_title = "";
// These are (1) the 320x200x8 paletted buffer that we draw to (i.e. the one
// that holds I_VideoBuffer), (2) the 320x200x32 RGBA intermediate buffer that
// we blit the former buffer to, (3) the intermediate 320x200 texture that we
// load the RGBA buffer to and that we render into another texture (4) which
// is upscaled by an integer factor UPSCALE using "nearest" scaling and which
// in turn is finally rendered to screen using "linear" scaling.
static SDL_Surface *screenbuffer = NULL;
static SDL_Surface *rgbabuffer = NULL;
static SDL_Texture *texture = NULL;
static SDL_Texture *texture_upscaled = NULL;
static SDL_Rect blit_rect = {
0,
0,
SCREENWIDTH,
SCREENHEIGHT
};
// palette
static SDL_Color palette[256];
static boolean palette_to_set;
// display has been set up?
static boolean initialized = false;
// disable mouse?
static boolean nomouse = false;
int usemouse = 1;
// Bit mask of mouse button state.
static unsigned int mouse_button_state = 0;
// Disallow mouse and joystick movement to cause forward/backward
// motion. Specified with the '-novert' command line parameter.
// This is an int to allow saving to config file
int novert = 0;
// Save screenshots in PNG format.
int png_screenshots = 0;
// Display disk activity indicator.
int show_diskicon = 1;
// Only display the disk icon if more then this much bytes have been read
// during the previous tic.
int diskicon_readbytes = 0;
// Screen width and height, from configuration file.
int screen_width = SCREENWIDTH;
int screen_height = SCREENHEIGHT;
// Automatically adjust video settings if the selected mode is
// not a valid video mode.
static int autoadjust_video_settings = 1;
// Run in full screen mode? (int type for config code)
int fullscreen = true;
// Aspect ratio correction mode
int aspect_ratio_correct = true;
// Time to wait for the screen to settle on startup before starting the
// game (ms)
static int startup_delay = 1000;
// Grab the mouse? (int type for config code)
static int grabmouse = true;
// The screen buffer; this is modified to draw things to the screen
byte *I_VideoBuffer = NULL;
// If true, game is running as a screensaver
boolean screensaver_mode = false;
// Flag indicating whether the screen is currently visible:
// when the screen isnt visible, don't render the screen
boolean screenvisible = true;
// If true, we display dots at the bottom of the screen to
// indicate FPS.
static boolean display_fps_dots;
// If this is true, the screen is rendered but not blitted to the
// video buffer.
static boolean noblit;
// Callback function to invoke to determine whether to grab the
// mouse pointer.
static grabmouse_callback_t grabmouse_callback = NULL;
// Does the window currently have focus?
static boolean window_focused = true;
// Empty mouse cursor
static SDL_Cursor *cursors[2];
// Window resize state.
static boolean need_resize = false;
static unsigned int resize_w, resize_h;
static unsigned int last_resize_time;
// If true, keyboard mapping is ignored, like in Vanilla Doom.
// The sensible thing to do is to disable this if you have a non-US
// keyboard.
int vanilla_keyboard_mapping = true;
// Is the shift key currently down?
static int shiftdown = 0;
// Mouse acceleration
//
// This emulates some of the behavior of DOS mouse drivers by increasing
// the speed when the mouse is moved fast.
//
// The mouse input values are input directly to the game, but when
// the values exceed the value of mouse_threshold, they are multiplied
// by mouse_acceleration to increase the speed.
float mouse_acceleration = 2.0;
int mouse_threshold = 10;
// Gamma correction level to use
int usegamma = 0;
static boolean MouseShouldBeGrabbed()
{
// never grab the mouse when in screensaver mode
if (screensaver_mode)
return false;
// if the window doesn't have focus, never grab it
if (!window_focused)
return false;
// always grab the mouse when full screen (dont want to
// see the mouse pointer)
if (fullscreen)
return true;
// Don't grab the mouse if mouse input is disabled
if (!usemouse || nomouse)
return false;
// if we specify not to grab the mouse, never grab
if (!grabmouse)
return false;
// Invoke the grabmouse callback function to determine whether
// the mouse should be grabbed
if (grabmouse_callback != NULL)
{
return grabmouse_callback();
}
else
{
return true;
}
}
void I_SetGrabMouseCallback(grabmouse_callback_t func)
{
grabmouse_callback = func;
}
// Set the variable controlling FPS dots.
void I_DisplayFPSDots(boolean dots_on)
{
display_fps_dots = dots_on;
}
// Show or hide the mouse cursor. We have to use different techniques
// depending on the OS.
static void SetShowCursor(boolean show)
{
// On Windows, using SDL_ShowCursor() adds lag to the mouse input,
// so work around this by setting an invisible cursor instead. On
// other systems, it isn't possible to change the cursor, so this
// hack has to be Windows-only. (Thanks to entryway for this)
#ifdef _WIN32
if (show)
{
SDL_SetCursor(cursors[1]);
}
else
{
SDL_SetCursor(cursors[0]);
}
#else
SDL_ShowCursor(show);
#endif
// When the cursor is hidden, grab the input.
if (!screensaver_mode)
{
SDL_SetWindowGrab(screen, !show);
}
}
//
// Translates the SDL key
//
static int TranslateKey(SDL_Keysym *sym)
{
int scancode = sym->scancode;
switch (scancode)
{
case SDL_SCANCODE_LCTRL:
case SDL_SCANCODE_RCTRL:
return KEY_RCTRL;
case SDL_SCANCODE_LSHIFT:
case SDL_SCANCODE_RSHIFT:
return KEY_RSHIFT;
case SDL_SCANCODE_LALT:
return KEY_LALT;
case SDL_SCANCODE_RALT:
return KEY_RALT;
default:
if (scancode >= 0 && scancode < arrlen(scancode_translate_table))
{
return scancode_translate_table[scancode];
}
else
{
return 0;
}
}
}
void I_ShutdownGraphics(void)
{
if (initialized)
{
SetShowCursor(true);
SDL_QuitSubSystem(SDL_INIT_VIDEO);
initialized = false;
}
}
//
// I_StartFrame
//
void I_StartFrame (void)
{
// er?
}
static void UpdateMouseButtonState(unsigned int button, boolean on)
{
event_t event;
if (button < SDL_BUTTON_LEFT || button > MAX_MOUSE_BUTTONS)
{
return;
}
// Note: button "0" is left, button "1" is right,
// button "2" is middle for Doom. This is different
// to how SDL sees things.
switch (button)
{
case SDL_BUTTON_LEFT:
button = 0;
break;
case SDL_BUTTON_RIGHT:
button = 1;
break;
case SDL_BUTTON_MIDDLE:
button = 2;
break;
default:
// SDL buttons are indexed from 1.
--button;
break;
}
// Turn bit representing this button on or off.
if (on)
{
mouse_button_state |= (1 << button);
}
else
{
mouse_button_state &= ~(1 << button);
}
// Post an event with the new button state.
event.type = ev_mouse;
event.data1 = mouse_button_state;
event.data2 = event.data3 = 0;
D_PostEvent(&event);
}
static int AccelerateMouse(int val)
{
if (val < 0)
return -AccelerateMouse(-val);
if (val > mouse_threshold)
{
return (int)((val - mouse_threshold) * mouse_acceleration + mouse_threshold);
}
else
{
return val;
}
}
// Get the equivalent ASCII (Unicode?) character for a keypress.
static int GetTypedChar(SDL_Event *event)
{
// If we're strictly emulating Vanilla, we should always act like
// we're using a US layout keyboard (in ev_keydown, data1=data2).
// Otherwise we should use the native key mapping.
if (vanilla_keyboard_mapping)
{
int result = TranslateKey(&event->key.keysym);
// If shift is held down, apply the original uppercase
// translation table used under DOS.
if ((SDL_GetModState() & KMOD_SHIFT) != 0
&& result >= 0 && result < arrlen(shiftxform))
{
result = shiftxform[result];
}
return result;
}
else
{
int unicode = event->key.keysym.sym;
if (unicode < 128)
{
return unicode;
}
else
{
return 0;
}
}
}
static void UpdateShiftStatus(SDL_Event *event)
{
int change;
if (event->type == SDL_KEYDOWN)
{
change = 1;
}
else if (event->type == SDL_KEYUP)
{
change = -1;
}
else
{
return;
}
if (event->key.keysym.sym == SDLK_LSHIFT
|| event->key.keysym.sym == SDLK_RSHIFT)
{
shiftdown += change;
}
}
static void HandleWindowEvent(SDL_WindowEvent *event)
{
switch (event->event)
{
#if 0 // SDL2-TODO
case SDL_ACTIVEEVENT:
// need to update our focus state
UpdateFocus();
break;
#endif
case SDL_WINDOWEVENT_EXPOSED:
palette_to_set = true;
break;
case SDL_WINDOWEVENT_RESIZED:
need_resize = true;
resize_w = event->data1;
resize_h = event->data2;
last_resize_time = SDL_GetTicks();
break;
// Don't render the screen when the window is minimized:
case SDL_WINDOWEVENT_MINIMIZED:
screenvisible = false;
break;
case SDL_WINDOWEVENT_MAXIMIZED:
case SDL_WINDOWEVENT_RESTORED:
screenvisible = true;
break;
// Update the value of window_focused when we get a focus event
//
// We try to make ourselves be well-behaved: the grab on the mouse
// is removed if we lose focus (such as a popup window appearing),
// and we dont move the mouse around if we aren't focused either.
case SDL_WINDOWEVENT_ENTER:
case SDL_WINDOWEVENT_FOCUS_GAINED:
window_focused = true;
break;
case SDL_WINDOWEVENT_LEAVE:
case SDL_WINDOWEVENT_FOCUS_LOST:
window_focused = false;
break;
default:
break;
}
}
void I_GetEvent(void)
{
SDL_Event sdlevent;
event_t event;
// possibly not needed
SDL_PumpEvents();
// put event-grabbing stuff in here
while (SDL_PollEvent(&sdlevent))
{
// ignore mouse events when the window is not focused
if (!window_focused
&& (sdlevent.type == SDL_MOUSEMOTION
|| sdlevent.type == SDL_MOUSEBUTTONDOWN
|| sdlevent.type == SDL_MOUSEBUTTONUP))
{
continue;
}
if (screensaver_mode && sdlevent.type == SDL_QUIT)
{
I_Quit();
}
UpdateShiftStatus(&sdlevent);
// process event
switch (sdlevent.type)
{
case SDL_KEYDOWN:
// data1 has the key pressed, data2 has the character
// (shift-translated, etc)
event.type = ev_keydown;
event.data1 = TranslateKey(&sdlevent.key.keysym);
event.data2 = GetTypedChar(&sdlevent);
if (event.data1 != 0)
{
D_PostEvent(&event);
}
break;
case SDL_KEYUP:
event.type = ev_keyup;
event.data1 = TranslateKey(&sdlevent.key.keysym);
// data2 is just initialized to zero for ev_keyup.
// For ev_keydown it's the shifted Unicode character
// that was typed, but if something wants to detect
// key releases it should do so based on data1
// (key ID), not the printable char.
event.data2 = 0;
if (event.data1 != 0)
{
D_PostEvent(&event);
}
break;
/*
case SDL_MOUSEMOTION:
event.type = ev_mouse;
event.data1 = mouse_button_state;
event.data2 = AccelerateMouse(sdlevent.motion.xrel);
event.data3 = -AccelerateMouse(sdlevent.motion.yrel);
D_PostEvent(&event);
break;
*/
case SDL_MOUSEBUTTONDOWN:
if (usemouse && !nomouse)
{
UpdateMouseButtonState(sdlevent.button.button, true);
}
break;
case SDL_MOUSEBUTTONUP:
if (usemouse && !nomouse)
{
UpdateMouseButtonState(sdlevent.button.button, false);
}
break;
case SDL_QUIT:
event.type = ev_quit;
D_PostEvent(&event);
break;
case SDL_WINDOWEVENT:
if (sdlevent.window.windowID == SDL_GetWindowID(screen))
{
HandleWindowEvent(&sdlevent.window);
}
break;
default:
break;
}
}
}
// Warp the mouse back to the middle of the screen
static void CenterMouse(void)
{
int screen_w, screen_h;
// Warp the the screen center
SDL_GetWindowSize(screen, &screen_w, &screen_h);
SDL_WarpMouseInWindow(screen, screen_w / 2, screen_h / 2);
// Clear any relative movement caused by warping
SDL_PumpEvents();
SDL_GetRelativeMouseState(NULL, NULL);
}
//
// Read the change in mouse state to generate mouse motion events
//
// This is to combine all mouse movement for a tic into one mouse
// motion event.
static void I_ReadMouse(void)
{
int x, y;
event_t ev;
SDL_GetRelativeMouseState(&x, &y);
if (x != 0 || y != 0)
{
ev.type = ev_mouse;
ev.data1 = mouse_button_state;
ev.data2 = AccelerateMouse(x);
if (!novert)
{
ev.data3 = -AccelerateMouse(y);
}
else
{
ev.data3 = 0;
}
D_PostEvent(&ev);
}
if (MouseShouldBeGrabbed())
{
CenterMouse();
}
}
//
// I_StartTic
//
void I_StartTic (void)
{
if (!initialized)
{
return;
}
I_GetEvent();
if (usemouse && !nomouse)
{
I_ReadMouse();
}
I_UpdateJoystick();
}
//
// I_UpdateNoBlit
//
void I_UpdateNoBlit (void)
{
// what is this?
}
static void UpdateGrab(void)
{
static boolean currently_grabbed = false;
boolean grab;
grab = MouseShouldBeGrabbed();
if (screensaver_mode)
{
// Hide the cursor in screensaver mode
SetShowCursor(false);
}
else if (grab && !currently_grabbed)
{
SetShowCursor(false);
CenterMouse();
}
else if (!grab && currently_grabbed)
{
int screen_w, screen_h;
SetShowCursor(true);
// When releasing the mouse from grab, warp the mouse cursor to
// the bottom-right of the screen. This is a minimally distracting
// place for it to appear - we may only have released the grab
// because we're at an end of level intermission screen, for
// example.
SDL_GetWindowSize(screen, &screen_w, &screen_h);
SDL_WarpMouseInWindow(screen, screen_w - 16, screen_h - 16);
SDL_GetRelativeMouseState(NULL, NULL);
}
currently_grabbed = grab;
}
static void CreateUpscaledTexture(int w, int h)
{
const int actualheight = aspect_ratio_correct ?
SCREENHEIGHT_4_3 :
SCREENHEIGHT;
int h_upscale, w_upscale;
static int h_upscale_old, w_upscale_old;
// When the screen or window dimensions do not match the aspect ratio
// of the texture, the rendered area is scaled down to fit. Calculate
// the actual dimensions of the rendered area.
if (w * actualheight < h * SCREENWIDTH)
{
// Tall window.
h = w * actualheight / SCREENWIDTH;
}
else
{
// Wide window.
w = h * SCREENWIDTH / actualheight;
}
// If one screen dimension matches an integer multiple of the original
// resolution, there is no need to overscale in this direction.
h_upscale = h / SCREENHEIGHT;
if (!h || h % SCREENHEIGHT)
{
h_upscale++;
}
w_upscale = w / SCREENWIDTH;
if (!w || w % SCREENWIDTH)
{
w_upscale++;
}
// Limit maximum texture dimensions to 1600x1200.
if (h_upscale > 6)
{
h_upscale = 6;
}
if (w_upscale > 5)
{
w_upscale = 5;
}
// Create a new texture only if the upscale factors have actually changed.
if (h_upscale == h_upscale_old && w_upscale == w_upscale_old)
{
return;
}
h_upscale_old = h_upscale;
w_upscale_old = w_upscale;
if (texture_upscaled)
{
SDL_DestroyTexture(texture_upscaled);
}
// Set the scaling quality for rendering the upscaled texture to "linear",
// which looks much softer and smoother than "nearest" but does a better
// job at downscaling from the upscaled texture to screen.
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
texture_upscaled = SDL_CreateTexture(renderer,
SDL_PIXELFORMAT_ARGB8888,
SDL_TEXTUREACCESS_TARGET,
w_upscale*SCREENWIDTH,
h_upscale*SCREENHEIGHT);
}
//
// I_FinishUpdate
//
void I_FinishUpdate (void)
{
static int lasttic;
int tics;
int i;
if (!initialized)
return;
if (noblit)
return;
if (need_resize && SDL_GetTicks() > last_resize_time + 1000/TICRATE)
{
CreateUpscaledTexture(resize_w, resize_h);
screen_width = resize_w;
screen_height = resize_h;
need_resize = false;
palette_to_set = true;
}
UpdateGrab();
#if 0 // SDL2-TODO
// Don't update the screen if the window isn't visible.
// Not doing this breaks under Windows when we alt-tab away
// while fullscreen.
if (!(SDL_GetAppState() & SDL_APPACTIVE))
return;
#endif
// draws little dots on the bottom of the screen
if (display_fps_dots)
{
i = I_GetTime();
tics = i - lasttic;
lasttic = i;
if (tics > 20) tics = 20;
for (i=0 ; i<tics*4 ; i+=4)
I_VideoBuffer[ (SCREENHEIGHT-1)*SCREENWIDTH + i] = 0xff;
for ( ; i<20*4 ; i+=4)
I_VideoBuffer[ (SCREENHEIGHT-1)*SCREENWIDTH + i] = 0x0;
}
if (palette_to_set)
{
SDL_SetPaletteColors(screenbuffer->format->palette, palette, 0, 256);
palette_to_set = false;
}
// Blit from the paletted 8-bit screen buffer to the intermediate
// 32-bit RGBA buffer that we can load into the texture.
SDL_LowerBlit(screenbuffer, &blit_rect, rgbabuffer, &blit_rect);
// Update the intermediate texture with the contents of the RGBA buffer.
SDL_UpdateTexture(texture, NULL, rgbabuffer->pixels, rgbabuffer->pitch);
// Make sure the pillarboxes are kept clear each frame.
SDL_RenderClear(renderer);
// Render this intermediate texture into the upscaled texture
// using "nearest" integer scaling.
SDL_SetRenderTarget(renderer, texture_upscaled);
SDL_RenderCopy(renderer, texture, NULL, NULL);
// Finally, render this upscaled texture to screen using linear scaling.
SDL_SetRenderTarget(renderer, NULL);
SDL_RenderCopy(renderer, texture_upscaled, NULL, NULL);
// Draw!
SDL_RenderPresent(renderer);
}
//
// I_ReadScreen
//
void I_ReadScreen (byte* scr)
{
memcpy(scr, I_VideoBuffer, SCREENWIDTH*SCREENHEIGHT*sizeof(*scr));
}
//
// I_SetPalette
//
void I_SetPalette (byte *doompalette)
{
int i;
for (i=0; i<256; ++i)
{
// Zero out the bottom two bits of each channel - the PC VGA
// controller only supports 6 bits of accuracy.
palette[i].r = gammatable[usegamma][*doompalette++] & ~3;
palette[i].g = gammatable[usegamma][*doompalette++] & ~3;
palette[i].b = gammatable[usegamma][*doompalette++] & ~3;
}
palette_to_set = true;
}
// Given an RGB value, find the closest matching palette index.
int I_GetPaletteIndex(int r, int g, int b)
{
int best, best_diff, diff;
int i;
best = 0; best_diff = INT_MAX;
for (i = 0; i < 256; ++i)
{
diff = (r - palette[i].r) * (r - palette[i].r)
+ (g - palette[i].g) * (g - palette[i].g)
+ (b - palette[i].b) * (b - palette[i].b);
if (diff < best_diff)
{
best = i;
best_diff = diff;
}
if (diff == 0)
{
break;
}
}
return best;
}
//
// Set the window title
//
void I_SetWindowTitle(char *title)
{
window_title = title;
}
//
// Call the SDL function to set the window title, based on
// the title set with I_SetWindowTitle.
//
void I_InitWindowTitle(void)
{
char *buf;
buf = M_StringJoin(window_title, " - ", PACKAGE_STRING, NULL);
SDL_SetWindowTitle(screen, buf);
free(buf);
}
// Set the application icon
void I_InitWindowIcon(void)
{
SDL_Surface *surface;
surface = SDL_CreateRGBSurfaceFrom((void *) icon_data, icon_w, icon_h,
32, icon_w * 4,
0xff << 24, 0xff << 16,
0xff << 8, 0xff << 0);
SDL_SetWindowIcon(screen, surface);
SDL_FreeSurface(surface);
}
// Set video size to a particular scale factor (1x, 2x, 3x, etc.)
static void SetScaleFactor(int factor)
{
int w, h;
// Pick 320x200 or 320x240, depending on aspect ratio correct
if (aspect_ratio_correct)
{
w = SCREENWIDTH;
h = SCREENHEIGHT_4_3;
}
else
{
w = SCREENWIDTH;
h = SCREENHEIGHT;
}
screen_width = w * factor;
screen_height = h * factor;
}
void I_GraphicsCheckCommandLine(void)
{
int i;
//!
// @vanilla
//
// Disable blitting the screen.
//
noblit = M_CheckParm ("-noblit");
//!
// @category video
//
// Grab the mouse when running in windowed mode.
//
if (M_CheckParm("-grabmouse"))
{
grabmouse = true;
}
//!
// @category video
//
// Don't grab the mouse when running in windowed mode.
//
if (M_CheckParm("-nograbmouse"))
{
grabmouse = false;
}
// default to fullscreen mode, allow override with command line
// nofullscreen because we love prboom
//!
// @category video
//
// Run in a window.
//
if (M_CheckParm("-window") || M_CheckParm("-nofullscreen"))
{
fullscreen = false;
}
//!
// @category video
//
// Run in fullscreen mode.
//
if (M_CheckParm("-fullscreen"))
{
fullscreen = true;
}
//!
// @category video
//
// Disable the mouse.
//
nomouse = M_CheckParm("-nomouse") > 0;
//!
// @category video
// @arg <x>
//
// Specify the screen width, in pixels.
//
i = M_CheckParmWithArgs("-width", 1);
if (i > 0)
{
screen_width = atoi(myargv[i + 1]);
}
//!
// @category video
// @arg <y>
//
// Specify the screen height, in pixels.
//
i = M_CheckParmWithArgs("-height", 1);
if (i > 0)
{
screen_height = atoi(myargv[i + 1]);
}
//!
// @category video
// @arg <WxY>[wf]
//
// Specify the dimensions of the window or fullscreen mode. An
// optional letter of w or f appended to the dimensions selects
// windowed or fullscreen mode.
i = M_CheckParmWithArgs("-geometry", 1);
if (i > 0)
{
int w, h, s;
char f;
s = sscanf(myargv[i + 1], "%ix%i%1c", &w, &h, &f);
if (s == 2 || s == 3)
{
screen_width = w;
screen_height = h;
if (s == 3 && f == 'f')
{
fullscreen = true;
}
else if (s == 3 && f == 'w')
{
fullscreen = false;
}
}
}
//!
// @category video
//
// Don't scale up the screen.
//
if (M_CheckParm("-1"))
{
SetScaleFactor(1);
}
//!
// @category video
//
// Double up the screen to 2x its normal size.
//
if (M_CheckParm("-2"))
{
SetScaleFactor(2);
}
//!
// @category video
//
// Double up the screen to 3x its normal size.
//
if (M_CheckParm("-3"))
{
SetScaleFactor(3);
}
//!
// @category video
//
// Disable vertical mouse movement.
//
if (M_CheckParm("-novert"))
{
novert = true;
}
//!
// @category video
//
// Enable vertical mouse movement.
//
if (M_CheckParm("-nonovert"))
{
novert = false;
}
}
// Check if we have been invoked as a screensaver by xscreensaver.
void I_CheckIsScreensaver(void)
{
char *env;
env = getenv("XSCREENSAVER_WINDOW");
if (env != NULL)
{
screensaver_mode = true;
}
}
static void CreateCursors(void)
{
static Uint8 empty_cursor_data = 0;
// Save the default cursor so it can be recalled later
cursors[1] = SDL_GetCursor();
// Create an empty cursor
cursors[0] = SDL_CreateCursor(&empty_cursor_data,
&empty_cursor_data,
1, 1, 0, 0);
}
static void SetSDLVideoDriver(void)
{
// Allow a default value for the SDL video driver to be specified
// in the configuration file.
if (strcmp(video_driver, "") != 0)
{
char *env_string;
env_string = M_StringJoin("SDL_VIDEODRIVER=", video_driver, NULL);
putenv(env_string);
free(env_string);
}
}
static void SetWindowPositionVars(void)
{
char buf[64];
int x, y;
if (window_position == NULL || !strcmp(window_position, ""))
{
return;
}
if (!strcmp(window_position, "center"))
{
putenv("SDL_VIDEO_CENTERED=1");
}
else if (sscanf(window_position, "%i,%i", &x, &y) == 2)
{
M_snprintf(buf, sizeof(buf), "SDL_VIDEO_WINDOW_POS=%i,%i", x, y);
putenv(buf);
}
}
static void SetVideoMode(int w, int h)
{
byte *doompal;
int flags = 0;
doompal = W_CacheLumpName(DEH_String("PLAYPAL"), PU_CACHE);
// If we are already running, we need to free the screenbuffer
// surface before setting the new mode.
if (screenbuffer != NULL)
{
SDL_FreeSurface(screenbuffer);
screenbuffer = NULL;
}
// Close the current window.
if (screen != NULL)
{
SDL_DestroyWindow(screen);
screen = NULL;
}
// Set the video mode.
flags = 0;
if (fullscreen)
{
// This flags means "Never change the screen resolution! Instead,
// draw to the entire screen by scaling the texture appropriately".
flags |= SDL_WINDOW_FULLSCREEN_DESKTOP;
}
else
{
// In windowed mode, the window can be resized while the game is
// running. This feature is disabled on OS X, as it adds an ugly
// scroll handle to the corner of the screen.
flags |= SDL_WINDOW_RESIZABLE;
}
// Create window and renderer contexts. We set the window title
// later anyway and leave the window position "undefined". If "flags"
// contains the fullscreen flag (see above), then w and h are ignored.
screen = SDL_CreateWindow(NULL, SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
w, h, flags);
if (screen == NULL)
{
I_Error("Error creating window for video mode %ix%i: %s\n",
w, h, SDL_GetError());
}
// If we are running fullscreen, the whole screen is our "window".
if (fullscreen)
{
SDL_DisplayMode mode;
// We do not change the video mode to run fullscreen but scale to fill
// the desktop that "screen" is assigned to. So, use desktop dimensions
// to calculate the size of the upscaled texture.
SDL_GetDesktopDisplayMode(SDL_GetWindowDisplayIndex(screen), &mode);
h = mode.h;
w = mode.w;
}
// The SDL_RENDERER_TARGETTEXTURE flag is required to render the
// intermediate texture into the upscaled texture.
renderer = SDL_CreateRenderer(screen, -1, SDL_RENDERER_TARGETTEXTURE);
if (renderer == NULL)
{
I_Error("Error creating renderer for video mode %ix%i: %s\n",
w, h, SDL_GetError());
}
// Important: Set the "logical size" of the rendering context. At the same
// time this also defines the aspect ratio that is preserved while scaling
// and stretching the texture into the window.
SDL_RenderSetLogicalSize(renderer,
SCREENWIDTH,
aspect_ratio_correct ? SCREENHEIGHT_4_3 : SCREENHEIGHT);
I_InitWindowTitle();
I_InitWindowIcon();
// Blank out the full screen area in case there is any junk in
// the borders that won't otherwise be overwritten.
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
SDL_RenderPresent(renderer);
// Create the 8-bit paletted and the 32-bit RGBA screenbuffer surfaces.
screenbuffer = SDL_CreateRGBSurface(0,
SCREENWIDTH, SCREENHEIGHT, 8,
0, 0, 0, 0);
SDL_FillRect(screenbuffer, NULL, 0);
rgbabuffer = SDL_CreateRGBSurface(0,
SCREENWIDTH, SCREENHEIGHT, 32,
0, 0, 0, 0);
SDL_FillRect(rgbabuffer, NULL, 0);
// Set the scaling quality for rendering the intermediate texture into
// the upscaled texture to "nearest", which is gritty and pixelated and
// resembles software scaling pretty well.
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "nearest");
// Create the intermediate texture that the RGBA surface gets loaded into.
// The SDL_TEXTUREACCESS_STREAMING flag means that this texture's content
// is going to change frequently.
texture = SDL_CreateTexture(renderer,
SDL_PIXELFORMAT_ARGB8888,
SDL_TEXTUREACCESS_STREAMING,
SCREENWIDTH, SCREENHEIGHT);
// Initially create the upscaled texture for rendering to screen
CreateUpscaledTexture(w, h);
}
void I_InitGraphics(void)
{
SDL_Event dummy;
byte *doompal;
char *env;
// Pass through the XSCREENSAVER_WINDOW environment variable to
// SDL_WINDOWID, to embed the SDL window into the Xscreensaver
// window.
env = getenv("XSCREENSAVER_WINDOW");
if (env != NULL)
{
char winenv[30];
int winid;
sscanf(env, "0x%x", &winid);
M_snprintf(winenv, sizeof(winenv), "SDL_WINDOWID=%i", winid);
putenv(winenv);
}
SetSDLVideoDriver();
SetWindowPositionVars();
if (SDL_Init(SDL_INIT_VIDEO) < 0)
{
I_Error("Failed to initialize video: %s", SDL_GetError());
}
// Warning to OS X users... though they might never see it :(
#ifdef __MACOSX__
if (fullscreen)
{
printf("Some old versions of OS X might crash in fullscreen mode.\n"
"If this happens to you, switch back to windowed mode.\n");
}
#endif
//
// Enter into graphics mode.
//
// When in screensaver mode, run full screen and auto detect
// screen dimensions (don't change video mode)
//
if (screensaver_mode)
{
SetVideoMode(0, 0);
}
else
{
// SDL2-TODO: sanity check screen_width/screen_height against
// screen modes listed as available by LibSDL, and auto-adjust
// when the selected mode is not available.
SetVideoMode(screen_width, screen_height);
}
// Start with a clear black screen
// (screen will be flipped after we set the palette)
SDL_FillRect(screenbuffer, NULL, 0);
// Set the palette
doompal = W_CacheLumpName(DEH_String("PLAYPAL"), PU_CACHE);
I_SetPalette(doompal);
SDL_SetPaletteColors(screenbuffer->format->palette, palette, 0, 256);
CreateCursors();
// SDL2-TODO UpdateFocus();
UpdateGrab();
// On some systems, it takes a second or so for the screen to settle
// after changing modes. We include the option to add a delay when
// setting the screen mode, so that the game doesn't start immediately
// with the player unable to see anything.
if (fullscreen && !screensaver_mode)
{
SDL_Delay(startup_delay);
}
// The actual 320x200 canvas that we draw to. This is the pixel buffer of
// the 8-bit paletted screen buffer that gets blit on an intermediate
// 32-bit RGBA screen buffer that gets loaded into a texture that gets
// finally rendered into our window or full screen in I_FinishUpdate().
I_VideoBuffer = screenbuffer->pixels;
V_RestoreBuffer();
// Clear the screen to black.
memset(I_VideoBuffer, 0, SCREENWIDTH * SCREENHEIGHT);
// We need SDL to give us translated versions of keys as well
// SDL2-TODO SDL_EnableUNICODE(1);
// Repeat key presses - this is what Vanilla Doom does
// Not sure about repeat rate - probably dependent on which DOS
// driver is used. This is good enough though.
// SDL2-TODO SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);
// clear out any events waiting at the start and center the mouse
while (SDL_PollEvent(&dummy));
initialized = true;
// Call I_ShutdownGraphics on quit
I_AtExit(I_ShutdownGraphics, true);
}
// Bind all variables controlling video options into the configuration
// file system.
void I_BindVideoVariables(void)
{
M_BindIntVariable("use_mouse", &usemouse);
M_BindIntVariable("autoadjust_video_settings", &autoadjust_video_settings);
M_BindIntVariable("fullscreen", &fullscreen);
M_BindIntVariable("aspect_ratio_correct", &aspect_ratio_correct);
M_BindIntVariable("startup_delay", &startup_delay);
M_BindIntVariable("screen_width", &screen_width);
M_BindIntVariable("screen_height", &screen_height);
M_BindIntVariable("grabmouse", &grabmouse);
M_BindFloatVariable("mouse_acceleration", &mouse_acceleration);
M_BindIntVariable("mouse_threshold", &mouse_threshold);
M_BindStringVariable("video_driver", &video_driver);
M_BindStringVariable("window_position", &window_position);
M_BindIntVariable("usegamma", &usegamma);
M_BindIntVariable("vanilla_keyboard_mapping", &vanilla_keyboard_mapping);
M_BindIntVariable("novert", &novert);
M_BindIntVariable("png_screenshots", &png_screenshots);
// Disable fullscreen by default on OS X, as there is an SDL bug
// where some old versions of OS X (<= Snow Leopard) crash.
#ifdef __MACOSX__
fullscreen = 0;
screen_width = 800;
screen_height = 600;
#endif
}