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picodrive/pico/32x/draw.c

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/*
* PicoDrive
* (C) notaz, 2009,2010
* (C) irixxxx, 2019-2024
*
* This work is licensed under the terms of MAME license.
* See COPYING file in the top-level directory.
*/
#include "../pico_int.h"
// NB: 32X officially doesn't support H32 mode. However, it does work since the
// cartridge slot carries the EDCLK signal which is always H40 clock and is used
// as video clock by the 32X. The H32 MD image is overlaid with the 320 px 32X
// image which has the same on-screen width. How the /YS signal on the cartridge
// slot (signalling the display of background color) is processed in this case
// is however unclear and might lead to glitches due to race conditions by the
// different video clocks for H32 and H40.
// BGR555 to native conversion
#if defined(USE_BGR555)
#define PXCONV(t) ((t)&(mr|mg|mb|mp))
#define PXPRIO 0x8000 // prio in MSB
#elif defined(USE_BGR565)
#define PXCONV(t) (((t)&mr) | (((t)&(mg|mb)) << 1) | (((t)&mp) >> 10))
#define PXPRIO 0x0020 // prio in LS green bit
#else // RGB565
#define PXCONV(t) ((((t)&mr) << 11) | (((t)&mg) << 1) | (((t)&(mp|mb)) >> 10))
#define PXPRIO 0x0020 // prio in LS green bit
#endif
int (*PicoScan32xBegin)(unsigned int num);
int (*PicoScan32xEnd)(unsigned int num);
int Pico32xDrawMode;
void *DrawLineDestBase32x;
int DrawLineDestIncrement32x;
static void convert_pal555(int invert_prio)
{
u32 *ps = (void *)Pico32xMem->pal;
u32 *pd = (void *)Pico32xMem->pal_native;
u32 mr = 0x001f001f; // masks for red, green, blue, prio
u32 mg = 0x03e003e0;
u32 mb = 0x7c007c00;
u32 mp = 0x80008000;
u32 inv = 0;
int i;
if (invert_prio)
inv = 0x80008000;
for (i = 0x100/2; i > 0; i--, ps++, pd++) {
u32 t = *ps ^ inv;
*pd = PXCONV(t);
}
Pico32x.dirty_pal = 0;
}
// direct color mode
#define do_line_dc(pd, p32x, pmd, inv, pmd_draw_code) \
{ \
const u16 mr = 0x001f; \
const u16 mg = 0x03e0; \
const u16 mb = 0x7c00; \
const u16 mp = 0x0000; \
unsigned short t; \
int i = 320; \
\
while (i > 0) { \
for (; i > 0 && (*pmd & 0x3f) == mdbg; pd++, pmd++, i--) { \
t = *p32x++; \
*pd = PXCONV(t); \
} \
for (; i > 0 && (*pmd & 0x3f) != mdbg; pd++, pmd++, i--) { \
t = *p32x++ ^ inv; \
if (t & 0x8000) \
*pd = PXCONV(t); \
else \
pmd_draw_code; \
} \
} \
}
// packed pixel mode
#define do_line_pp(pd, p32x, pmd, pmd_draw_code) \
{ \
unsigned short t; \
int i = 320; \
while (i > 0) { \
for (; i > 0 && (*pmd & 0x3f) == mdbg; pd++, pmd++, i--) { \
t = pal[*(unsigned char *)(MEM_BE2((uintptr_t)(p32x++)))]; \
*pd = t; \
} \
for (; i > 0 && (*pmd & 0x3f) != mdbg; pd++, pmd++, i--) { \
t = pal[*(unsigned char *)(MEM_BE2((uintptr_t)(p32x++)))]; \
if (t & PXPRIO) \
*pd = t; \
else \
pmd_draw_code; \
} \
} \
}
// run length mode
#define do_line_rl(pd, p32x, pmd, pmd_draw_code) \
{ \
unsigned short len, t; \
int i; \
for (i = 320; i > 0; p32x++) { \
t = pal[*p32x & 0xff]; \
for (len = (*p32x >> 8) + 1; len > 0 && i > 0; len--, i--, pd++, pmd++) { \
if ((*pmd & 0x3f) == mdbg || (t & PXPRIO)) \
*pd = t; \
else \
pmd_draw_code; \
} \
} \
}
// this is almost never used (Wiz and menu bg gen only)
void FinalizeLine32xRGB555(int sh, int line, struct PicoEState *est)
{
unsigned short *pd = est->DrawLineDest;
unsigned short *pal = Pico32xMem->pal_native;
unsigned char *pmd = est->HighCol + 8;
unsigned short *dram, *p32x;
unsigned char mdbg;
FinalizeLine555(sh, line, est);
if ((Pico32x.vdp_regs[0] & P32XV_Mx) == 0 || // 32x blanking
(Pico.video.debug_p & PVD_KILL_32X))
{
return;
}
dram = (void *)Pico32xMem->dram[Pico32x.vdp_regs[0x0a/2] & P32XV_FS];
p32x = dram + dram[line];
mdbg = Pico.video.reg[7] & 0x3f;
if ((Pico32x.vdp_regs[0] & P32XV_Mx) == 2) { // Direct Color Mode
int inv_bit = (Pico32x.vdp_regs[0] & P32XV_PRI) ? 0x8000 : 0;
do_line_dc(pd, p32x, pmd, inv_bit,);
return;
}
if (Pico32x.dirty_pal)
convert_pal555(Pico32x.vdp_regs[0] & P32XV_PRI);
if ((Pico32x.vdp_regs[0] & P32XV_Mx) == 1) { // Packed Pixel Mode
unsigned char *p32xb = (void *)p32x;
if (Pico32x.vdp_regs[2 / 2] & P32XV_SFT)
p32xb++;
do_line_pp(pd, p32xb, pmd,);
}
else { // Run Length Mode
do_line_rl(pd, p32x, pmd,);
}
}
#define MD_LAYER_CODE \
*dst = palmd[*pmd]
#define PICOSCAN_PRE \
PicoScan32xBegin(l + (lines_sft_offs & 0xff)); \
dst = Pico.est.DrawLineDest; \
#define PICOSCAN_POST \
PicoScan32xEnd(l + (lines_sft_offs & 0xff)); \
Pico.est.DrawLineDest = (char *)Pico.est.DrawLineDest + DrawLineDestIncrement32x; \
#define make_do_loop(name, pre_code, post_code, md_code) \
/* Direct Color Mode */ \
static void do_loop_dc##name(unsigned short *dst, \
unsigned short *dram, int lines_sft_offs, int mdbg) \
{ \
int inv_bit = (Pico32x.vdp_regs[0] & P32XV_PRI) ? 0x8000 : 0; \
unsigned char *pmd = Pico.est.Draw2FB + \
328 * (lines_sft_offs & 0xff) + 8; \
unsigned short *palmd = Pico.est.HighPal; \
unsigned short *p32x; \
int lines = lines_sft_offs >> 16; \
int l; \
(void)palmd; \
for (l = 0; l < lines; l++, pmd += 8) { \
pre_code; \
p32x = dram + dram[l]; \
do_line_dc(dst, p32x, pmd, inv_bit, md_code); \
post_code; \
dst += DrawLineDestIncrement32x/2 - 320; \
} \
} \
\
/* Packed Pixel Mode */ \
static void do_loop_pp##name(unsigned short *dst, \
unsigned short *dram, int lines_sft_offs, int mdbg) \
{ \
unsigned short *pal = Pico32xMem->pal_native; \
unsigned char *pmd = Pico.est.Draw2FB + \
328 * (lines_sft_offs & 0xff) + 8; \
unsigned short *palmd = Pico.est.HighPal; \
unsigned char *p32x; \
int lines = lines_sft_offs >> 16; \
int l; \
(void)palmd; \
for (l = 0; l < lines; l++, pmd += 8) { \
pre_code; \
p32x = (void *)(dram + dram[l]); \
p32x += (lines_sft_offs >> 8) & 1; \
do_line_pp(dst, p32x, pmd, md_code); \
post_code; \
dst += DrawLineDestIncrement32x/2 - 320; \
} \
} \
\
/* Run Length Mode */ \
static void do_loop_rl##name(unsigned short *dst, \
unsigned short *dram, int lines_sft_offs, int mdbg) \
{ \
unsigned short *pal = Pico32xMem->pal_native; \
unsigned char *pmd = Pico.est.Draw2FB + \
328 * (lines_sft_offs & 0xff) + 8; \
unsigned short *palmd = Pico.est.HighPal; \
unsigned short *p32x; \
int lines = lines_sft_offs >> 16; \
int l; \
(void)palmd; \
for (l = 0; l < lines; l++, pmd += 8) { \
pre_code; \
p32x = dram + dram[l]; \
do_line_rl(dst, p32x, pmd, md_code); \
post_code; \
dst += DrawLineDestIncrement32x/2 - 320; \
} \
}
#ifdef _ASM_32X_DRAW
#undef make_do_loop
#define make_do_loop(name, pre_code, post_code, md_code) \
extern void do_loop_dc##name(unsigned short *dst, \
unsigned short *dram, int lines_offs, int mdbg); \
extern void do_loop_pp##name(unsigned short *dst, \
unsigned short *dram, int lines_offs, int mdbg); \
extern void do_loop_rl##name(unsigned short *dst, \
unsigned short *dram, int lines_offs, int mdbg);
#endif
make_do_loop(,,,)
make_do_loop(_md, , , MD_LAYER_CODE)
make_do_loop(_scan, PICOSCAN_PRE, PICOSCAN_POST, )
make_do_loop(_scan_md, PICOSCAN_PRE, PICOSCAN_POST, MD_LAYER_CODE)
typedef void (*do_loop_func)(unsigned short *dst, unsigned short *dram, int lines, int mdbg);
enum { DO_LOOP, DO_LOOP_MD, DO_LOOP_SCAN, DO_LOOP_MD_SCAN };
static const do_loop_func do_loop_dc_f[] = { do_loop_dc, do_loop_dc_md, do_loop_dc_scan, do_loop_dc_scan_md };
static const do_loop_func do_loop_pp_f[] = { do_loop_pp, do_loop_pp_md, do_loop_pp_scan, do_loop_pp_scan_md };
static const do_loop_func do_loop_rl_f[] = { do_loop_rl, do_loop_rl_md, do_loop_rl_scan, do_loop_rl_scan_md };
void PicoDraw32xLayer(int offs, int lines, int md_bg)
{
int have_scan = PicoScan32xBegin != NULL && PicoScan32xEnd != NULL;
const do_loop_func *do_loop;
unsigned short *dram;
int lines_sft_offs;
int which_func;
Pico.est.DrawLineDest = (char *)DrawLineDestBase32x + offs * DrawLineDestIncrement32x;
Pico.est.DrawLineDestIncr = DrawLineDestIncrement32x;
dram = Pico32xMem->dram[Pico32x.vdp_regs[0x0a/2] & P32XV_FS];
if (Pico32xDrawMode == PDM32X_BOTH)
PicoDrawUpdateHighPal();
if ((Pico32x.vdp_regs[0] & P32XV_Mx) == 2)
{
// Direct Color Mode
do_loop = do_loop_dc_f;
goto do_it;
}
if (Pico32x.dirty_pal)
convert_pal555(Pico32x.vdp_regs[0] & P32XV_PRI);
if ((Pico32x.vdp_regs[0] & P32XV_Mx) == 1)
{
// Packed Pixel Mode
do_loop = do_loop_pp_f;
}
else
{
// Run Length Mode
do_loop = do_loop_rl_f;
}
do_it:
if (Pico32xDrawMode == PDM32X_BOTH)
which_func = have_scan ? DO_LOOP_MD_SCAN : DO_LOOP_MD;
else
which_func = have_scan ? DO_LOOP_SCAN : DO_LOOP;
lines_sft_offs = (lines << 16) | offs;
if (Pico32x.vdp_regs[2 / 2] & P32XV_SFT)
lines_sft_offs |= 1 << 8;
do_loop[which_func](Pico.est.DrawLineDest, dram, lines_sft_offs, md_bg);
}
// mostly unused, games tend to keep 32X layer on
void PicoDraw32xLayerMdOnly(int offs, int lines)
{
int have_scan = PicoScan32xBegin != NULL && PicoScan32xEnd != NULL;
unsigned short *dst = (void *)((char *)DrawLineDestBase32x + offs * DrawLineDestIncrement32x);
unsigned char *pmd = Pico.est.Draw2FB + 328 * offs + 8;
unsigned short *pal = Pico.est.HighPal;
int poffs = 0, plen = 320;
int l, p;
PicoDrawUpdateHighPal();
dst += poffs;
for (l = 0; l < lines; l++) {
if (have_scan) {
PicoScan32xBegin(l + offs);
dst = (unsigned short *)Pico.est.DrawLineDest + poffs;
}
for (p = 0; p < plen; p += 4) {
dst[p + 0] = pal[*pmd++];
dst[p + 1] = pal[*pmd++];
dst[p + 2] = pal[*pmd++];
dst[p + 3] = pal[*pmd++];
}
dst = Pico.est.DrawLineDest = (char *)dst + DrawLineDestIncrement32x;
pmd += 328 - plen;
if (have_scan)
PicoScan32xEnd(l + offs);
}
}
void PicoDrawSetOutFormat32x(pdso_t which, int use_32x_line_mode)
{
if (which == PDF_RGB555) {
// CLUT pixels needed as well, for layer priority
PicoDrawSetInternalBuf(Pico.est.Draw2FB, 328);
PicoDrawSetOutBufMD(NULL, 0);
} else {
// store CLUT pixels, same layout as alt renderer
PicoDrawSetInternalBuf(NULL, 0);
PicoDrawSetOutBufMD(Pico.est.Draw2FB, 328);
}
if (use_32x_line_mode)
// we'll draw via FinalizeLine32xRGB555 (rare)
Pico32xDrawMode = PDM32X_OFF;
else
// in RGB555 mode the 32x layer is drawn over the MD layer, in the other
// modes 32x and MD layer are merged together by the 32x renderer
Pico32xDrawMode = (which == PDF_RGB555) ? PDM32X_32X_ONLY : PDM32X_BOTH;
}
void PicoDrawSetOutBuf32X(void *dest, int increment)
{
DrawLineDestBase32x = dest;
DrawLineDestIncrement32x = increment;
// in RGB555 mode this buffer is also used by the MD renderer
if (Pico32xDrawMode != PDM32X_BOTH)
PicoDrawSetOutBufMD(DrawLineDestBase32x, DrawLineDestIncrement32x);
}
// vim:shiftwidth=2:ts=2:expandtab
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