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id_vw.c
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id_vw.c
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/* Keen Dreams (SDL2/Steam Port) Source Code
* Copyright (C) 2014 Javier M. Chavez
* Copyright (C) 2015 David Gow <[email protected]>
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
// ID_VW.C
#include "id_heads.h"
#include <SDL2/SDL.h>
#include <GL/glew.h>
/*
=============================================================================
LOCAL CONSTANTS
=============================================================================
*/
#define VIEWWIDTH 40
#define PIXTOBLOCK 4 // 16 pixels to an update block
#if GRMODE == EGAGR
#define SCREENXMASK (~7)
#define SCREENXPLUS (7)
#define SCREENXDIV (1)
#endif
#if GRMODE == CGAGR
#define SCREENXMASK (~3)
#define SCREENXDIV (4)
#endif
/*
=============================================================================
GLOBAL VARIABLES
=============================================================================
*/
cardtype videocard; // set by VW_Startup
grtype grmode; // CGAgr, EGAgr, VGAgr
SDL_Window *window;
SDL_GLContext glcontext;
unsigned bufferofs = 0; // hidden area to draw to before displaying
unsigned displayofs = 0; // origin of the visable screen
unsigned panx,pany; // panning adjustments inside port in pixels
unsigned pansx,pansy; // panning adjustments inside port in screen
// block limited pixel values (ie 0/8 for ega x)
unsigned panadjust; // panx/pany adjusted by screen resolution
unsigned screenseg; // normally 0xa000 / 0xb800
unsigned linewidth;
unsigned ylookup[VIRTUALHEIGHT];
boolean screenfaded;
pictabletype *pictable;
pictabletype *picmtable;
spritetabletype *spritetable;
/*
=============================================================================
LOCAL VARIABLES
=============================================================================
*/
void VWL_MeasureString (char *string, word *width, word *height,
fontstruct *font);
void VWL_DrawCursor (void);
void VWL_EraseCursor (void);
void VWL_DBSetup (void);
void VWL_UpdateScreenBlocks (void);
int bordercolor;
int cursorvisible;
int cursornumber,cursorwidth,cursorheight,cursorx,cursory;
memptr cursorsave;
unsigned cursorspot;
boolean cursorhw = true; // Are we using a hardware cursor?
boolean fakecga = false;
boolean aspectcorrect = true;
boolean hiddencard = false;
boolean noglcard = false;
extern unsigned bufferwidth,bufferheight; // used by font drawing stuff
//===========================================================================
/*
=======================
=
= VW_Startup
=
=======================
*/
static char *ParmStrings[] = {"HIDDENCARD", "WINDOWED", "NOASPECT", "NOCARD", "NOGLCARD", ""};
void VW_GL_SetIcon(SDL_Window *wnd);
void VW_Startup (void)
{
int i;
int fullscreen = true;
SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK | SDL_INIT_GAMECONTROLLER);
videocard = 0;
for (i = 1;i < _argc;i++)
{
int p = US_CheckParm(_argv[i],ParmStrings);
if (p == 0)
{
hiddencard = true;
videocard = EGAcard;
}
else if (p == 1)
{
fullscreen = false;
}
else if (p == 2)
{
aspectcorrect = false;
}
else if (p == 3 || p == 4)
{
noglcard = true;
}
}
if (!videocard)
videocard = VW_VideoID ();
#if GRMODE == EGAGR
grmode = EGAGR;
if (videocard != EGAcard && videocard != VGAcard)
Quit ("Improper video card! If you really have an EGA/VGA card that I am not \n"
"detecting, use the -HIDDENCARD command line parameter!");
EGAWRITEMODE(0);
#endif
#if GRMODE == CGAGR
grmode = CGAGR;
if (videocard < CGAcard || videocard > VGAcard)
Quit ("Improper video card! If you really have a CGA card that I am not \n"
"detecting, use the -HIDDENCARD command line parameter!");
MM_GetPtr (&(memptr)screenseg,0x10000l); // grab 64k for floating screen
#endif
cursorvisible = 0;
SDL_DisplayMode dm;
SDL_GetDesktopDisplayMode(0, &dm);
int h = 200;
while (h + 200 < dm.h)
h += 200;
int w = h * 4 / 3;
VWL_SetupVideoMemory();
window = SDL_CreateWindow("Keen Dreams", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, w, h, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
SDL_SetWindowMinimumSize(window, 320, 200);
if (fullscreen)
SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN_DESKTOP);
VW_GL_SetIcon(window);
glcontext = SDL_GL_CreateContext(window);
glewInit();
glViewport(0,0,320,200);
VW_GL_Init();
VW_SetDefaultColors();
}
//===========================================================================
/*
=======================
=
= VW_Shutdown
=
=======================
*/
void VW_Shutdown (void)
{
VW_SetScreenMode (TEXTGR);
#if GRMODE == EGAGR
VW_SetLineWidth (80);
#endif
}
//===========================================================================
/*
========================
=
= VW_SetScreenMode
= Call BIOS to set TEXT / CGAgr / EGAgr / VGAgr
=
========================
*/
void VW_SetScreenMode (int grmode)
{
switch (grmode)
{
case TEXTGR:
screenseg=0xb000;
break;
case CGAGR:
// screenseg is actually a main mem buffer
break;
case EGAGR:
screenseg=0xa000;
break;
#ifdef VGAGAME
case VGAGR:{
char extern VGAPAL; // deluxepaint vga pallet .OBJ file
void far *vgapal = &VGAPAL;
SetCool256 (); // custom 256 color mode
screenseg=0xa000;
_ES = FP_SEG(vgapal);
_DX = FP_OFF(vgapal);
_BX = 0;
_CX = 0x100;
_AX = 0x1012;
geninterrupt(0x10); // set the deluxepaint pallet
break;
#endif
}
VW_SetLineWidth(SCREENWIDTH);
}
/*
=============================================================================
SCREEN FADES
=============================================================================
*/
char colors[7][17]=
{{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0,1,2,3,4,5,6,7,0},
{0,0,0,0,0,0,0,0,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,0},
{0,1,2,3,4,5,6,7,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,0},
{0,1,2,3,4,5,6,7,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0},
{0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f}};
char cgacolors[17] =
{0,0x1b,0x1d,0x1f,0,0x1b,0x1d,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0};
void VW_ColorBorder (int color)
{
// XXX: Do interupt.
bordercolor = color;
}
void VW_SetDefaultColors(void)
{
if (fakecga)
VW_GL_SetEGAPalette(cgacolors);
else
{
colors[3][16] = bordercolor;
VW_GL_SetEGAPalette(colors[3]);
screenfaded = false;
}
}
void VW_FadeOut(void)
{
if (fakecga)
VW_GL_SetEGAPalette(cgacolors);
else
{
int i;
for (i=3;i>=0;i--)
{
colors[i][16] = bordercolor;
VW_GL_SetEGAPalette(colors[i]);
VW_WaitVBL(6);
}
screenfaded = true;
}
}
void VW_FadeIn(void)
{
if (fakecga)
VW_GL_SetEGAPalette(cgacolors);
else
{
int i;
for (i=0;i<4;i++)
{
colors[i][16] = bordercolor;
VW_GL_SetEGAPalette(colors[i]);
VW_WaitVBL(6);
}
screenfaded = false;
}
}
void VW_FadeUp(void)
{
if (fakecga)
VW_GL_SetEGAPalette(cgacolors);
else
{
int i;
for (i=3;i<6;i++)
{
colors[i][16] = bordercolor;
VW_GL_SetEGAPalette(colors[i]);
VW_WaitVBL(6);
}
screenfaded = true;
}
}
void VW_FadeDown(void)
{
if (fakecga)
VW_GL_SetEGAPalette(cgacolors);
else
{
int i;
for (i=5;i>2;i--)
{
colors[i][16] = bordercolor;
VW_GL_SetEGAPalette(colors[i]);
VW_WaitVBL(6);
}
screenfaded = false;
}
}
//===========================================================================
/*
====================
=
= VW_SetLineWidth
=
= Must be an even number of bytes
=
====================
*/
void VW_SetLineWidth (int width)
{
int i,offset;
#if GRMODE == EGAGR
//
// set wide virtual screen
//
#endif
//
// set up lookup tables
//
linewidth = width;
offset = 0;
for (i=0;i<VIRTUALHEIGHT;i++)
{
ylookup[i]=offset;
offset += width;
}
VW_GL_UpdateLineWidth();
}
//===========================================================================
/*
====================
=
= VW_ClearVideo
=
====================
*/
void VW_ClearVideo (int color)
{
#if GRMODE == EGAGR
EGAWRITEMODE(2);
EGAMAPMASK(15);
#endif
// XXX memset vmem 0xffff bytes to zero
#if GRMODE == EGAGR
EGAWRITEMODE(0);
#endif
}
//===========================================================================
#if NUMPICS>0
/*
====================
=
= VW_DrawPic
=
= X in bytes, y in pixels, chunknum is the #defined picnum
=
====================
*/
void VW_DrawPic(unsigned x, unsigned y, unsigned chunknum)
{
int picnum = chunknum - STARTPICS;
memptr source;
unsigned dest,width,height;
source = grsegs[chunknum];
dest = ylookup[y]+x+bufferofs;
width = pictable[picnum].width;
height = pictable[picnum].height;
VW_MemToScreen(source,dest,width,height);
}
#endif
#if NUMPICM>0
/*
====================
=
= VW_DrawMPic
=
= X in bytes, y in pixels, chunknum is the #defined picnum
=
====================
*/
void VW_DrawMPic(unsigned x, unsigned y, unsigned chunknum)
{
int picnum = chunknum - STARTPICM;
memptr source;
unsigned dest,width,height;
source = grsegs[chunknum];
dest = ylookup[y]+x+bufferofs;
width = pictable[picnum].width;
height = pictable[picnum].height;
VW_MaskBlock(source,0,dest,width,height,width*height);
}
#endif
//===========================================================================
#if NUMSPRITES>0
/*
====================
=
= VW_DrawSprite
=
= X and Y in pixels, it will match the closest shift possible
=
= To do:
= Add vertical clipping!
= Make the shifts act as center points, rather than break points
=
====================
*/
void VW_DrawSprite(int x, int y, unsigned chunknum)
{
spritetabletype far *spr;
unsigned dest,shift;
spr = &spritetable[chunknum-STARTSPRITES];
y+=spr->orgy>>G_P_SHIFT;
x+=spr->orgx>>G_P_SHIFT;
#if GRMODE == EGAGR
shift = 0;// XXX (x&7)/2;
#endif
#if GRMODE == CGAGR
shift = 0;
#endif
dest = bufferofs + ylookup[y];
if (x>=0)
dest += x/SCREENXDIV;
else
dest += (x+1)/SCREENXDIV;
VW_RawBlitToScreen (grsegs[chunknum],dest,
spr->width*8,spr->height);
}
#endif
/*
==================
=
= VW_Hlin
=
==================
*/
#if GRMODE == EGAGR
unsigned char leftmask[8] = {0xff,0x7f,0x3f,0x1f,0xf,7,3,1};
unsigned char rightmask[8] = {0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff};
void VW_Hlin(unsigned xl, unsigned xh, unsigned y, unsigned color)
{
uint8_t *screen = &vw_videomem[bufferofs];
unsigned x;
for(x = xl; x <= xh; ++x)
{
screen[(y*linewidth+x)%VW_VIDEOMEM_SIZE] = color;
}
}
#endif
#if GRMODE == CGAGR
unsigned char pixmask[4] = {0xc0,0x30,0x0c,0x03};
unsigned char leftmask[4] = {0xff,0x3f,0x0f,0x03};
unsigned char rightmask[4] = {0xc0,0xf0,0xfc,0xff};
unsigned char colorbyte[4] = {0,0x55,0xaa,0xff};
//
// could be optimized for rep stosw
//
void VW_Hlin(unsigned xl, unsigned xh, unsigned y, unsigned color)
{
unsigned dest,xlb,xhb,mid;
byte maskleft,maskright;
color = colorbyte[color]; // expand 2 color bits to 8
xlb=xl/4;
xhb=xh/4;
maskleft = leftmask[xl&3];
maskright = rightmask[xh&3];
mid = xhb-xlb-1;
dest = bufferofs+ylookup[y]+xlb;
if (xlb==xhb)
{
//
// entire line is in one byte
//
maskleft&=maskright;
return;
}
}
#endif
/*
==================
=
= VW_Bar
=
= Pixel addressable block fill routine
=
==================
*/
void VW_Bar (unsigned x, unsigned y, unsigned width, unsigned height,
unsigned color)
{
unsigned xh = x+width-1;
while (height--)
VW_Hlin (x,xh,y++,color);
}
//==========================================================================
/*
==================
=
= VW_MeasureString
=
==================
*/
#if NUMFONT+NUMFONTM>0
void
VWL_MeasureString (char far *string, word *width, word *height, fontstruct _seg *font)
{
*height = font->height;
for (*width = 0;*string;string++)
*width += font->width[*string]; // proportional width
}
void VW_MeasurePropString (char far *string, word *width, word *height)
{
VWL_MeasureString(string,width,height,(fontstruct _seg *)grsegs[STARTFONT]);
}
void VW_MeasureMPropString (char far *string, word *width, word *height)
{
VWL_MeasureString(string,width,height,(fontstruct _seg *)grsegs[STARTFONTM]);
}
#endif
/*
=============================================================================
CGA stuff
=============================================================================
*/
#if GRMODE == CGAGR
#define CGACRTCWIDTH 40
/*
==========================
=
= VW_CGAFullUpdate
=
==========================
*/
void VW_CGAFullUpdate (void)
{
byte *update;
boolean halftile;
unsigned x,y,middlerows,middlecollumns;
displayofs = bufferofs+panadjust;
// XXX fascinating CGA code, read in orig cource
updateptr = baseupdateptr;
*(unsigned *)(updateptr + UPDATEWIDE*PORTTILESHIGH) = UPDATETERMINATE;
}
#endif
/*
=============================================================================
CURSOR ROUTINES
These only work in the context of the double buffered update routines
=============================================================================
*/
/*
====================
=
= VWL_DrawCursor
=
= Background saves, then draws the cursor at cursorspot
=
====================
*/
void VWL_DrawCursor (void)
{
if (!cursorhw)
{
cursorspot = bufferofs + ylookup[cursory+pansy]+(cursorx+pansx)/SCREENXDIV;
VW_RawScreenToMem(cursorspot,cursorsave,cursorwidth,cursorheight);
VWB_DrawSprite(cursorx,cursory,cursornumber);
}
else
{
// Some touchscreen devices will force-hide the cursor, so reshow it every frame.
SDL_ShowCursor(cursorvisible);
}
}
//==========================================================================
/*
====================
=
= VWL_EraseCursor
=
====================
*/
void VWL_EraseCursor (void)
{
if (!cursorhw)
{
VW_RawMemToScreen(cursorsave,cursorspot,cursorwidth,cursorheight);
VW_MarkUpdateBlock ((cursorx+pansx)&SCREENXMASK,cursory+pansy,
( (cursorx+pansx)&SCREENXMASK)+cursorwidth,
cursory+pansy+cursorheight);
}
}
//==========================================================================
/*
====================
=
= VW_ShowCursor
=
====================
*/
void VW_ShowCursor (void)
{
cursorvisible++;
if (cursorhw)
{
SDL_ShowCursor(cursorvisible > 0);
SDL_SetRelativeMouseMode(!(cursorvisible > 0));
}
else
{
SDL_ShowCursor(false);
SDL_SetRelativeMouseMode(true);
}
}
//==========================================================================
/*
====================
=
= VW_HideCursor
=
====================
*/
void VW_HideCursor (void)
{
cursorvisible--;
if (cursorhw)
{
SDL_ShowCursor(cursorvisible > 0);
SDL_SetRelativeMouseMode(!(cursorvisible > 0));
}
else
{
SDL_ShowCursor(false);
SDL_SetRelativeMouseMode(true);
}
}
//==========================================================================
/*
====================
=
= VW_MoveCursor
=
====================
*/
void VW_MoveCursor (int x, int y)
{
if (cursorhw)
{
int vx, vy, vw, vh;
VW_GL_GetViewport(&vx, &vy, &vw, &vh);
SDL_WarpMouseInWindow(window, x*vw/320+vx, y*vh/200+vy);
}
cursorx = x;
cursory = y;
}
//==========================================================================
/*
====================
=
= VW_SetCursor
=
= Load in a sprite to be used as a cursor, and allocate background save space
=
====================
*/
void VW_SetCursor (int spritenum)
{
if (cursornumber)
{
MM_SetLock (&grsegs[cursornumber],false);
if (!cursorhw)
MM_FreePtr (&cursorsave);
}
cursornumber = spritenum;
if (!spritenum)
return;
CA_CacheGrChunk (spritenum);
MM_SetLock (&grsegs[cursornumber],true);
cursorwidth = spritetable[spritenum-STARTSPRITES].width*8;
cursorheight = spritetable[spritenum-STARTSPRITES].height;
int cursorscalex = 1, cursorscaley = 1;
int winw, winh;
VW_GL_GetViewport(0,0, &winw, &winh);
cursorscalex = winw/320;
cursorscaley = winh/200;
// Intel graphics hw fails on large cursors.
if (cursorscalex > 2) cursorscalex = 2;
if (cursorscaley > 2) cursorscaley = 2;
if (cursorhw)
{
SDL_Surface *mouseSurface = SDL_CreateRGBSurface(0, cursorwidth*cursorscalex, cursorheight*cursorscaley, 32, 0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000);
SDL_LockSurface(mouseSurface);
VW_PAL8ScaleToRGBA(((grsegs[cursornumber])), mouseSurface->pixels, cursorscalex, cursorscaley, mouseSurface->pitch, cursorwidth, cursorheight);
SDL_UnlockSurface(mouseSurface);
SDL_Cursor *mouseCursor = SDL_CreateColorCursor(mouseSurface, spritetable[cursornumber-STARTSPRITES].orgx*cursorscalex, spritetable[cursornumber-STARTSPRITES].orgy*cursorscaley);
SDL_SetCursor(mouseCursor);
}
else
MM_GetPtr (&cursorsave,cursorwidth*cursorheight);
}
/*
=============================================================================
Double buffer management routines
=============================================================================
*/
/*
======================
=
= VW_InitDoubleBuffer
=
======================
*/
void VW_InitDoubleBuffer (void)
{
#if GRMODE == EGAGR
VW_SetScreen (displayofs+panadjust,0); // no pel pan
#endif
}
/*
======================
=
= VW_FixRefreshBuffer
=
= Copies the view page to the buffer page on page flipped refreshes to
= avoid a one frame shear around pop up windows
=
======================
*/
void VW_FixRefreshBuffer (void)
{
#if GRMODE == EGAGR
VW_ScreenToScreen (displayofs,bufferofs,PORTTILESWIDE*4*CHARWIDTH,
PORTTILESHIGH*16);
#endif
}
/*
======================
=
= VW_QuitDoubleBuffer
=
======================
*/
void VW_QuitDoubleBuffer (void)
{
}
/*
=======================
=
= VW_MarkUpdateBlock
=
= Takes a pixel bounded block and marks the tiles in bufferblocks
= Returns 0 if the entire block is off the buffer screen
=
=======================
*/
int VW_MarkUpdateBlock (int x1, int y1, int x2, int y2)
{
int x,y,xt1,yt1,xt2,yt2,nextline;
byte *mark;
xt1 = x1>>PIXTOBLOCK;
yt1 = y1>>PIXTOBLOCK;
xt2 = x2>>PIXTOBLOCK;
yt2 = y2>>PIXTOBLOCK;
if (xt1<0)
xt1=0;
else if (xt1>=UPDATEWIDE-1)
return 0;
if (yt1<0)
yt1=0;
else if (yt1>UPDATEHIGH)
return 0;
if (xt2<0)
return 0;
else if (xt2>=UPDATEWIDE-1)
xt2 = UPDATEWIDE-2;
if (yt2<0)
return 0;
else if (yt2>=UPDATEHIGH)
yt2 = UPDATEHIGH-1;
mark = updateptr + uwidthtable[yt1] + xt1;
nextline = UPDATEWIDE - (xt2-xt1) - 1;
for (y=yt1;y<=yt2;y++)
{
for (x=xt1;x<=xt2;x++)
*mark++ = 1; // this tile will need to be updated
mark += nextline;
}
return 1;
}
/*
===========================
=
= VW_UpdateScreen
=
= Updates any changed areas of the double buffer and displays the cursor
=
===========================
*/
void VW_UpdateScreen (void)
{
if (cursorvisible>0)