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core, handle background color DMA (aka fantom bitmap)

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kub 2024-01-13 12:07:13 +01:00
parent 68e06234e3
commit 724db457da
4 changed files with 97 additions and 1 deletions
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86
pico/draw.c
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@ -1599,7 +1599,59 @@ void BackFill(int bgc, int sh, struct PicoEState *est)
// --------------------------------------------
void PicoDoHighPal555_8bit(int sh, int line, struct PicoEState *est)
static u16 *BgcDMAbase;
static u32 BgcDMAsrc, BgcDMAmask;
static int BgcDMAlen, BgcDMAoffs;
#ifndef _ASM_DRAW_C
static
#endif
// handle DMA to background color
int BgcDMA(u16 *pd, int len, struct PicoEState *est)
{
int xl = (len == 320 ? 38 : 33); // DMA slots during HSYNC
int upscale = (est->rendstatus & PDRAW_SOFTSCALE) && len < 320;
if (BgcDMAlen > 0) {
// BG color DMA under way. TODO for now handles the line as all background.
int i, l = len;
u16 *q = upscale ? DefOutBuff : pd;
u16 t;
if ((est->rendstatus & PDRAW_BORDER_32) && !upscale)
q += (320-len) / 2;
BgcDMAlen -= (l>>1)+xl;
if (BgcDMAlen < 0)
// partial line
l += 2*BgcDMAlen;
for (i = 0; i < l; i += 2) {
// TODO use ps to overwrite only real bg pixels
t = BgcDMAbase[BgcDMAsrc++ & BgcDMAmask];
q[i] = q[i+1] = PXCONV(t);
}
BgcDMAsrc += xl; // HSYNC DMA
t = est->HighPal[Pico.video.reg[7] & 0x3f];
while (i < len) q[i++] = t; // fill partial line with BG
if (upscale) {
switch (PicoIn.filter) {
case 3: h_upscale_bl4_4_5(pd, 320, q, 256, len, f_nop); break;
case 2: h_upscale_bl2_4_5(pd, 320, q, 256, len, f_nop); break;
case 1: h_upscale_snn_4_5(pd, 320, q, 256, len, f_nop); break;
default: h_upscale_nn_4_5(pd, 320, q, 256, len, f_nop); break;
}
}
return 1;
}
return 0;
}
// --------------------------------------------
static void PicoDoHighPal555_8bit(int sh, int line, struct PicoEState *est)
{
unsigned int *spal, *dpal;
unsigned int cnt = (sh ? 1 : est->SonicPalCount+1);
@ -1695,6 +1747,9 @@ void FinalizeLine555(int sh, int line, struct PicoEState *est)
else if ((PicoIn.AHW & PAHW_SMS) && (est->Pico->video.reg[0] & 0x20))
len -= 8, ps += 8;
if (BgcDMA(pd, len, est))
return;
if ((est->rendstatus & PDRAW_SOFTSCALE) && len < 320) {
if (len >= 240 && len <= 256) {
pd += (256-len)>>1;
@ -2111,6 +2166,35 @@ void PicoDrawRefreshSprites(void)
}
}
void PicoDrawBgcDMA(u16 *base, u32 source, u32 mask, int dlen, int sl)
{
struct PicoEState *est = &Pico.est;
int len = (est->Pico->video.reg[12]&1) ? 320 : 256;
int xl = (est->Pico->video.reg[12]&1) ? 38 : 33; // DMA slots during HSYNC
BgcDMAbase = base;
BgcDMAsrc = source;
BgcDMAmask = mask;
BgcDMAlen = dlen;
BgcDMAoffs = 0;
// handle slot offset in 1st line
if (sl-12 > 0) // active display output only starts at slot 12
BgcDMAoffs = 2*(sl-12);
else if (sl < 0) { // DMA starts before active display
BgcDMAsrc += 2*-sl;
BgcDMAlen -= 2*-sl;
}
// skip 1st line if it had been drawn already
if (Pico.est.DrawScanline > Pico.m.scanline) {
len -= BgcDMAoffs;
BgcDMAsrc += (len>>1)+xl;
BgcDMAlen -= (len>>1)+xl;
BgcDMAoffs = 0;
}
}
// also works for fast renderer
void PicoDrawUpdateHighPal(void)
{