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/* (C) 2001 Vasyl Tsvirkunov */
#include <windows.h>
#include "gx.h"
#include "screen.h"
#define SMOOTH
#define MAX_CLR 0x100
#ifdef SMOOTH
static UBYTE palRed[MAX_CLR];
static UBYTE palGreen[MAX_CLR];
static UBYTE palBlue[MAX_CLR];
#endif
static unsigned short pal[MAX_CLR];
GXDisplayProperties gxdp;
int active;
struct tScreenGeometry
{
long width;
long height;
long startoffset;
long sourceoffset;
long linestep;
long pixelstep;
long xSkipMask;
long xLimit;
long lineLimit;
};
tScreenGeometry geom[3];
int currentScreenMode = 0;
int useMode = 0;
int maxMode = 2;
void SetScreenMode(int mode)
{
currentScreenMode = mode;
if(currentScreenMode > maxMode)
currentScreenMode = 0;
}
int GetScreenMode()
{
return currentScreenMode;
}
void GraphicsSuspend()
{
if(active)
{
active = 0;
GXSuspend();
}
}
void GraphicsResume()
{
if(!active)
{
active = 1;
GXResume();
}
}
void GraphicsOff(void)
{
GXCloseDisplay();
active = 0;
}
int GraphicsOn(HWND hWndMain)
{
GXOpenDisplay(hWndMain, GX_FULLSCREEN);
gxdp = GXGetDisplayProperties();
if((gxdp.ffFormat & (kfDirect555 | kfDirect565)) == 0 || gxdp.cxWidth < 240 || gxdp.cyHeight < 240)
{
GraphicsOff();
return 1;
}
// portrait
geom[0].width = gxdp.cxWidth; // 240
geom[0].height = gxdp.cyHeight; // 320
geom[0].startoffset = 0;
geom[0].sourceoffset = 0;
geom[0].linestep = gxdp.cbyPitch;
geom[0].pixelstep = gxdp.cbxPitch;
geom[0].xSkipMask = gxdp.cxWidth < 320 ? 0x00000003 : 0xffffffff;
geom[0].xLimit = 320; // skip 1/4
geom[0].lineLimit = 320*200;
// left handed landscape
geom[1].width = gxdp.cyHeight; // 320
geom[1].height = gxdp.cxWidth; // 240
geom[1].startoffset = gxdp.cbyPitch*(gxdp.cyHeight-1);
geom[1].sourceoffset = 0;
geom[1].linestep = gxdp.cbxPitch;
geom[1].pixelstep = -gxdp.cbyPitch;
geom[1].xSkipMask = 0xffffffff;
geom[1].xLimit = 320; // no skip
geom[1].lineLimit = 320*200;
// right handed landscape
geom[2].width = gxdp.cyHeight; // 320
geom[2].height = gxdp.cxWidth; // 240
geom[2].startoffset = gxdp.cbxPitch*(gxdp.cxWidth-1);
geom[2].sourceoffset = 0;
geom[2].linestep = -gxdp.cbxPitch;
geom[2].pixelstep = gxdp.cbyPitch;
geom[2].xSkipMask = 0xffffffff;
geom[2].xLimit = 320; // no skip
geom[2].lineLimit = 320*200;
if(gxdp.cyHeight < 320)
maxMode = 0; // portrait only!
active = 1;
return 0;
}
void SetPalEntry(int ent, UBYTE r, UBYTE g, UBYTE b)
{
if (ent >= MAX_CLR)
return;
#ifdef SMOOTH
palRed[ent] = r;
palGreen[ent] = g;
palBlue[ent] = b;
#endif
if(gxdp.ffFormat & kfDirect565)
pal[ent] = ((r&0xf8)<<(11-3))|((g&0xfc)<<(5-2))|((b&0xf8)>>3);
else if(gxdp.ffFormat & kfDirect555)
pal[ent] = ((r&0xf8)<<(10-3))|((g&0xf8)<<(5-2))|((b&0xf8)>>3);
}
void Cls()
{
int x, y;
UBYTE* dst;
UBYTE *scraddr;
scraddr = (UBYTE*)GXBeginDraw();
if(scraddr)
{
for(y=0; y<geom[useMode].height; y++)
{
dst = scraddr+geom[useMode].startoffset;
for(x=0; x<geom[useMode].width; x++)
{
*(unsigned short*)dst = 0;
dst += geom[useMode].pixelstep;
}
scraddr += geom[useMode].linestep;
}
GXEndDraw();
}
}
int counter = 0;
void Blt(UBYTE * scr_ptr)
{
static UBYTE *src;
static UBYTE *dst;
static UBYTE *scraddr;
static UBYTE *scr_ptr_limit;
static UBYTE *src_limit;
static long pixelstep;
static long linestep;
static long skipmask;
#ifdef SMOOTH
static bool b565 = (gxdp.ffFormat & kfDirect565);
#endif
if(!active)
{
Sleep(100);
return;
}
/* Update screen mode, also thread protection by doing this */
if(useMode != currentScreenMode)
{
useMode = currentScreenMode;
Cls();
}
scraddr = (UBYTE*)GXBeginDraw();
if(scraddr)
{
scraddr += geom[useMode].startoffset;
scr_ptr += geom[useMode].sourceoffset;
scr_ptr_limit = scr_ptr + geom[useMode].lineLimit;
pixelstep = geom[useMode].pixelstep;
linestep = geom[useMode].linestep;
src_limit = scr_ptr + geom[useMode].xLimit;
skipmask = geom[useMode].xSkipMask;
/* Internal pixel loops */
#ifdef SMOOTH
if(skipmask == 3)
{
while(scr_ptr < scr_ptr_limit)
{
src = scr_ptr;
dst = scraddr;
while(src < src_limit)
{
UBYTE r, g, b;
r = (3*palRed[*(src+0)] + palRed[*(src+1)])>>2;
g = (3*palGreen[*(src+0)] + palGreen[*(src+1)])>>2;
b = (3*palBlue[*(src+0)] + palBlue[*(src+1)])>>2;
if(b565)
*(unsigned short*)dst = ((r&0xf8)<<(11-3))|((g&0xfc)<<(5-2))|((b&0xf8)>>3);
else
*(unsigned short*)dst = ((r&0xf8)<<(10-3))|((g&0xf8)<<(5-2))|((b&0xf8)>>3);
dst += pixelstep;
r = (palRed[*(src+1)] + palRed[*(src+2)])>>1;
g = (palGreen[*(src+1)] + palGreen[*(src+2)])>>1;
b = (palBlue[*(src+1)] + palBlue[*(src+2)])>>1;
if(b565)
*(unsigned short*)dst = ((r&0xf8)<<(11-3))|((g&0xfc)<<(5-2))|((b&0xf8)>>3);
else
*(unsigned short*)dst = ((r&0xf8)<<(10-3))|((g&0xf8)<<(5-2))|((b&0xf8)>>3);
dst += pixelstep;
r = (palRed[*(src+2)] + 3*palRed[*(src+3)])>>2;
g = (palGreen[*(src+2)] + 3*palGreen[*(src+3)])>>2;
b = (palBlue[*(src+2)] + 3*palBlue[*(src+3)])>>2;
if(b565)
*(unsigned short*)dst = ((r&0xf8)<<(11-3))|((g&0xfc)<<(5-2))|((b&0xf8)>>3);
else
*(unsigned short*)dst = ((r&0xf8)<<(10-3))|((g&0xf8)<<(5-2))|((b&0xf8)>>3);
dst += pixelstep;
src += 4;
}
scraddr += linestep;
scr_ptr += 320;
src_limit += 320;
}
}
else
#endif
if(skipmask != 0xffffffff)
{
while(scr_ptr < scr_ptr_limit)
{
src = scr_ptr;
dst = scraddr;
while(src < src_limit)
{
if((long)src & skipmask)
{
*(unsigned short*)dst = pal[*src];
dst += pixelstep;
}
src ++;
}
scraddr += linestep;
scr_ptr += 320;
src_limit += 320;
}
}
else
{
while(scr_ptr < scr_ptr_limit)
{
src = scr_ptr;
dst = scraddr;
while(src < src_limit)
{
*(unsigned short*)dst = pal[*src];
dst += pixelstep;
src ++;
}
scraddr += linestep;
scr_ptr += 320;
src_limit += 320;
}
}
GXEndDraw();
}
}
void Translate(int* px, int* py)
{
int x, y;
switch(currentScreenMode)
{
case 0: /* portrait */
*px = *px*4/3;
break;
case 1: /* landscape left */
x = 320 - *py;
y = *px;
*px = x;
*py = y;
break;
case 2: /* landscape right */
x = *py;
y = 240 - *px;
*px = x;
*py = y;
break;
}
}
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