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render.c
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/*
only update window clip on window change (?)
fix leftmost window/nta render and window bug
sprite masking isn't right in sonic/micromachines 2, but
seems ok in galaxy force 2
*/
#include "shared.h"
#ifdef ALIGN_LONG
/* Or change the names if you depend on these from elsewhere.. */
#undef READ_LONG
#undef WRITE_LONG
static __inline__ uint32 READ_LONG(void *address)
{
if ((uint32)address & 3)
{
#ifdef LSB_FIRST /* little endian version */
return ( *((uint8 *)address) +
(*((uint8 *)address+1) << 8) +
(*((uint8 *)address+2) << 16) +
(*((uint8 *)address+3) << 24) );
#else /* big endian version */
return ( *((uint8 *)address+3) +
(*((uint8 *)address+2) << 8) +
(*((uint8 *)address+1) << 16) +
(*((uint8 *)address) << 24) );
#endif /* LSB_FIRST */
}
else
return *(uint32 *)address;
}
static __inline__ void WRITE_LONG(void *address, uint32 data)
{
if ((uint32)address & 3)
{
#ifdef LSB_FIRST
*((uint8 *)address) = data;
*((uint8 *)address+1) = (data >> 8);
*((uint8 *)address+2) = (data >> 16);
*((uint8 *)address+3) = (data >> 24);
#else
*((uint8 *)address+3) = data;
*((uint8 *)address+2) = (data >> 8);
*((uint8 *)address+1) = (data >> 16);
*((uint8 *)address) = (data >> 24);
#endif /* LSB_FIRST */
return;
}
else
*(uint32 *)address = data;
}
#endif /* ALIGN_LONG */
#ifdef ALIGN_LONG
/* Draw a single 8-pixel column */
#define DRAW_COLUMN(ATTR, LINE) \
atex = atex_table[(ATTR >> 13) & 7]; \
src = (uint32 *)&bg_pattern_cache[(ATTR & 0x1FFF) << 6 | (LINE)]; \
WRITE_LONG(dst, READ_LONG(src) | atex); \
dst++; \
src++; \
WRITE_LONG(dst, READ_LONG(src) | atex); \
dst++; \
src++; \
ATTR >>= 16; \
atex = atex_table[(ATTR >> 13) & 7]; \
src = (uint32 *)&bg_pattern_cache[(ATTR & 0x1FFF) << 6 | (LINE)]; \
WRITE_LONG(dst, READ_LONG(src) | atex); \
dst++; \
src++; \
WRITE_LONG(dst, READ_LONG(src) | atex); \
dst++; \
src++;
#else
/* Draw a single 8-pixel column */
#define DRAW_COLUMN(ATTR, LINE) \
atex = atex_table[(ATTR >> 13) & 7]; \
src = (uint32 *)&bg_pattern_cache[(ATTR & 0x1FFF) << 6 | (LINE)]; \
*dst++ = (*src++ | atex); \
*dst++ = (*src++ | atex); \
ATTR >>= 16; \
atex = atex_table[(ATTR >> 13) & 7]; \
src = (uint32 *)&bg_pattern_cache[(ATTR & 0x1FFF) << 6 | (LINE)]; \
*dst++ = (*src++ | atex); \
*dst++ = (*src++ | atex);
#endif /* ALIGN_LONG */
#ifdef ALIGN_LONG
/* Draw a single 16-pixel column */
#define DRAW_COLUMN_IM2(ATTR, LINE) \
atex = atex_table[(ATTR >> 13) & 7]; \
offs = (ATTR & 0x03FF) << 7 | (ATTR & 0x1800) << 6 | (LINE); \
if(ATTR & 0x1000) offs ^= 0x40; \
src = (uint32 *)&bg_pattern_cache[offs]; \
WRITE_LONG(dst, READ_LONG(src) | atex); \
dst++; \
src++; \
WRITE_LONG(dst, READ_LONG(src) | atex); \
dst++; \
src++; \
ATTR >>= 16; \
atex = atex_table[(ATTR >> 13) & 7]; \
offs = (ATTR & 0x03FF) << 7 | (ATTR & 0x1800) << 6 | (LINE); \
if(ATTR & 0x1000) offs ^= 0x40; \
src = (uint32 *)&bg_pattern_cache[offs]; \
WRITE_LONG(dst, READ_LONG(src) | atex); \
dst++; \
src++; \
WRITE_LONG(dst, READ_LONG(src) | atex); \
dst++; \
src++;
#else
/* Draw a single 16-pixel column */
#define DRAW_COLUMN_IM2(ATTR, LINE) \
atex = atex_table[(ATTR >> 13) & 7]; \
offs = (ATTR & 0x03FF) << 7 | (ATTR & 0x1800) << 6 | (LINE); \
if(ATTR & 0x1000) offs ^= 0x40; \
src = (uint32 *)&bg_pattern_cache[offs]; \
*dst++ = (*src++ | atex); \
*dst++ = (*src++ | atex); \
ATTR >>= 16; \
atex = atex_table[(ATTR >> 13) & 7]; \
offs = (ATTR & 0x03FF) << 7 | (ATTR & 0x1800) << 6 | (LINE); \
if(ATTR & 0x1000) offs ^= 0x40; \
src = (uint32 *)&bg_pattern_cache[offs]; \
*dst++ = (*src++ | atex); \
*dst++ = (*src++ | atex);
#endif /* ALIGN_LONG */
/*
gcc complains about this:
*lb++ = table[(*lb << 8) |(*src++ | palette)];
.. claiming the result on lb is undefined.
So we manually advance lb and use constant offsets into the line buffer.
*/
#define DRAW_SPRITE_TILE \
lb[0] = table[(lb[0] << 8) |(*src++ | palette)]; \
lb[1] = table[(lb[1] << 8) |(*src++ | palette)]; \
lb[2] = table[(lb[2] << 8) |(*src++ | palette)]; \
lb[3] = table[(lb[3] << 8) |(*src++ | palette)]; \
lb[4] = table[(lb[4] << 8) |(*src++ | palette)]; \
lb[5] = table[(lb[5] << 8) |(*src++ | palette)]; \
lb[6] = table[(lb[6] << 8) |(*src++ | palette)]; \
lb[7] = table[(lb[7] << 8) |(*src++ | palette)]
/* Pixel creation macros, input is four bits each */
/* 8:8:8 RGB */
#define MAKE_PIXEL_32(r,g,b) ((r) << 20 | (g) << 12 | (b) << 4)
/* 5:5:5 RGB */
#define MAKE_PIXEL_15(r,g,b) ((r) << 11 | (g) << 6 | (b) << 1)
/* 5:6:5 RGB */
#define MAKE_PIXEL_16(r,g,b) ((r) << 12 | (g) << 7 | (b) << 1)
/* 3:3:2 RGB */
#define MAKE_PIXEL_8(r,g,b) ((r) << 5 | (g) << 2 | ((b) >> 1))
/* Clip data */
static clip_t clip[2];
/* Attribute expansion table */
static const uint32 atex_table[] = {
0x00000000, 0x10101010, 0x20202020, 0x30303030,
0x40404040, 0x50505050, 0x60606060, 0x70707070
};
/* Sprite name look-up table */
uint8 name_lut[0x400];
/* Sprite line buffer data */
uint8 object_index_count;
struct {
uint16 ypos;
uint16 xpos;
uint16 attr;
uint8 size;
uint8 index;
}object_info[20];
/* Pixel look-up tables and table base address */
uint8 *lut[5];
uint8 *lut_base;
/* 8-bit pixel remapping data */
uint8 pixel_8[0x100];
uint8 pixel_8_lut[3][0x200];
/* 15-bit pixel remapping data */
uint16 pixel_15[0x100];
uint16 pixel_15_lut[3][0x200];
/* 16-bit pixel remapping data */
uint16 pixel_16[0x100];
uint16 pixel_16_lut[3][0x200];
/* 32-bit pixel remapping data */
uint32 pixel_32[0x100];
uint32 pixel_32_lut[3][0x200];
/* Line buffers */
uint8 tmp_buf[0x400]; /* Temporary buffer */
uint8 bg_buf[0x400]; /* Merged background buffer */
uint8 nta_buf[0x400]; /* Plane A / Window line buffer */
uint8 ntb_buf[0x400]; /* Plane B line buffer */
uint8 obj_buf[0x400]; /* Object layer line buffer */
/*--------------------------------------------------------------------------*/
/* Init, reset, shutdown routines */
/*--------------------------------------------------------------------------*/
int render_init(void)
{
int bx, ax, i;
/* Allocate and align pixel look-up tables */
lut_base = malloc((LUT_MAX * LUT_SIZE) + LUT_SIZE);
lut[0] = (uint8 *)(((uint32)lut_base + LUT_SIZE) & ~(LUT_SIZE - 1));
for(i = 1; i < LUT_MAX; i += 1)
{
lut[i] = lut[0] + (i * LUT_SIZE);
}
/* Make pixel look-up table data */
for(bx = 0; bx < 0x100; bx += 1)
for(ax = 0; ax < 0x100; ax += 1)
{
uint16 index = (bx << 8) | (ax);
lut[0][index] = make_lut_bg(bx, ax);
lut[1][index] = make_lut_obj(bx, ax);
lut[2][index] = make_lut_bg_ste(bx, ax);
lut[3][index] = make_lut_obj_ste(bx, ax);
lut[4][index] = make_lut_bgobj_ste(bx, ax);
}
/* Make pixel data tables */
for(i = 0; i < 0x200; i += 1)
{
int r, g, b;
r = (i >> 6) & 7;
g = (i >> 3) & 7;
b = (i >> 0) & 7;
pixel_8_lut[0][i] = MAKE_PIXEL_8(r>>1,g>>1,b>>1);
pixel_8_lut[1][i] = MAKE_PIXEL_8(r,g,b);
pixel_8_lut[2][i] = MAKE_PIXEL_8((r>>1)|4,(g>>1)|4,(b>>1)|4);
pixel_15_lut[0][i] = MAKE_PIXEL_15(r,g,b);
pixel_15_lut[1][i] = MAKE_PIXEL_15(r<<1,g<<1,b<<1);
pixel_15_lut[2][i] = MAKE_PIXEL_15(r|8,g|8,b|8);
pixel_16_lut[0][i] = MAKE_PIXEL_16(r,g,b);
pixel_16_lut[1][i] = MAKE_PIXEL_16(r<<1,g<<1,b<<1);
pixel_16_lut[2][i] = MAKE_PIXEL_16(r|8,g|8,b|8);
pixel_32_lut[0][i] = MAKE_PIXEL_32(r,g,b);
pixel_32_lut[1][i] = MAKE_PIXEL_32(r<<1,g<<1,b<<1);
pixel_32_lut[2][i] = MAKE_PIXEL_32(r|8,g|8,b|8);
}
/* Set up color update function */
color_update = NULL;
if(bitmap.remap)
{
switch(bitmap.depth)
{
case 8: color_update = color_update_8; break;
case 15: color_update = color_update_15; break;
case 16: color_update = color_update_16; break;
case 32: color_update = color_update_32; break;
}
}
/* Make sprite name look-up table */
make_name_lut();
return (1);
}
void make_name_lut(void)
{
int col, row;
int vcol, vrow;
int width, height;
int flipx, flipy;
int i, name;
memset(name_lut, 0, sizeof(name_lut));
for(i = 0; i < 0x400; i += 1)
{
vcol = col = i & 3;
vrow = row = (i >> 2) & 3;
height = (i >> 4) & 3;
width = (i >> 6) & 3;
flipx = (i >> 8) & 1;
flipy = (i >> 9) & 1;
if(flipx)
vcol = (width - col);
if(flipy)
vrow = (height - row);
name = vrow + (vcol * (height + 1));
if((row > height) || col > width)
name = -1;
name_lut[i] = name;
}
}
void render_reset(void)
{
memset(&clip, 0, sizeof(clip));
memset(bg_buf, 0, sizeof(bg_buf));
memset(tmp_buf, 0, sizeof(tmp_buf));
memset(nta_buf, 0, sizeof(nta_buf));
memset(ntb_buf, 0, sizeof(ntb_buf));
memset(obj_buf, 0, sizeof(obj_buf));
memset(&pixel_8, 0, sizeof(pixel_8));
memset(&pixel_15, 0, sizeof(pixel_15));
memset(&pixel_16, 0, sizeof(pixel_16));
memset(&pixel_32, 0, sizeof(pixel_32));
}
void render_shutdown(void)
{
if(lut_base) free(lut_base);
}
/*--------------------------------------------------------------------------*/
/* Line render function */
/*--------------------------------------------------------------------------*/
void render_line(int line)
{
uint8 *lb = (bitmap.remap) ? tmp_buf : &bitmap.data[(line * bitmap.pitch)];
if((reg[1] & 0x40) == 0x00)
{
/* Use the overscan color to clear the screen */
memset(&lb[bitmap.viewport.x], 0x40 | border, bitmap.viewport.w);
}
else
{
update_bg_pattern_cache();
window_clip(line);
if(im2_flag)
{
render_ntx_im2(0, line, lb);
render_ntx_im2(1, line, ntb_buf);
}
else
{
if(reg[0x0B] & 4)
{
render_ntx_vs(0, line, nta_buf);
render_ntx_vs(1, line, ntb_buf);
}
else
{
render_ntx(0, line, nta_buf);
render_ntx(1, line, ntb_buf);
}
}
if(im2_flag)
render_ntw_im2(line, nta_buf);
else
render_ntw(line, nta_buf);
if(reg[12] & 8)
{
merge(&nta_buf[0x20], &ntb_buf[0x20], &bg_buf[0x20], lut[2], (reg[12] & 1) ? 320 : 256);
memset(&obj_buf[0x20], 0, (reg[12] & 1) ? 320 : 256);
if(im2_flag)
render_obj_im2(line, obj_buf, lut[3]);
else
render_obj(line, obj_buf, lut[3]);
merge(&obj_buf[0x20], &bg_buf[0x20], &lb[0x20], lut[4], (reg[12] & 1) ? 320 : 256);
}
else
{
merge(&nta_buf[0x20], &ntb_buf[0x20], &lb[0x20], lut[0], (reg[12] & 1) ? 320 : 256);
if(im2_flag)
render_obj_im2(line, lb, lut[1]);
else
render_obj(line, lb, lut[1]);
}
}
if(reg[0] & 0x20)
{
memset(&lb[bitmap.viewport.x], 0x40 | border, 0x08);
}
if(bitmap.remap)
{
int width = (reg[12] & 1) ? 320 : 256;
void *out = (void *)&bitmap.data[(line * bitmap.pitch) + (bitmap.viewport.x * bitmap.granularity)];
switch(bitmap.depth)
{
case 8:
remap_8(lb+0x20, (uint8 *)out, pixel_8, width);
break;
case 15:
remap_16(lb+0x20, (uint16 *)out, pixel_15, width);
break;
case 16:
remap_16(lb+0x20, (uint16 *)out, pixel_16, width);
break;
case 32:
remap_32(lb+0x20, (uint32 *)out, pixel_32, width);
break;
}
}
}
/*--------------------------------------------------------------------------*/
/* Window rendering */
/*--------------------------------------------------------------------------*/
void render_ntw(int line, uint8 *buf)
{
int column, v_line, width;
uint32 *nt, *src, *dst, atex, atbuf;
v_line = (line & 7) << 3;
width = (reg[12] & 1) ? 7 : 6;
nt = (uint32 *)&vram[ntwb | ((line >> 3) << width)];
dst = (uint32 *)&buf[0x20 + (clip[1].left << 4)];
for(column = clip[1].left; column < clip[1].right; column += 1)
{
atbuf = nt[column];
DRAW_COLUMN(atbuf, v_line)
}
}
void render_ntw_im2(int line, uint8 *buf)
{
int column, v_line, width;
uint32 *nt, *src, *dst, atex, atbuf, offs;
v_line = ((line & 7) << 1 | ((status >> 4) & 1)) << 3;
width = (reg[12] & 1) ? 7 : 6;
nt = (uint32 *)&vram[ntwb | ((line >> 3) << width)];
dst = (uint32 *)&buf[0x20 + (clip[1].left << 4)];
for(column = clip[1].left; column < clip[1].right; column += 1)
{
atbuf = nt[column];
DRAW_COLUMN_IM2(atbuf, v_line)
}
}
/*--------------------------------------------------------------------------*/
/* Background plane rendering */
/*--------------------------------------------------------------------------*/
void render_ntx(int which, int line, uint8 *buf)
{
int column;
int start, end;
int index;
int shift;
int nametable_row_mask = (playfield_col_mask >> 1);
int v_line;
uint32 atex, atbuf, *src, *dst;
uint16 xascroll, xbscroll, xscroll;
int y_scroll;
uint32 *nt;
int vsr_shift;
uint32 *vs;
uint16 table;
table = (which) ? ntbb : ntab;
get_hscroll(line, &xascroll, &xbscroll);
xscroll = (which) ? xbscroll : xascroll;
shift = (xscroll & 0x0F);
index = ((playfield_col_mask + 1) >> 1) - ((xscroll >> 4) & nametable_row_mask);
if(which)
{
start = 0;
end = (reg[0x0C] & 1) ? 20 : 16;
}
else
{
// Looks correct if clip[0].left has 1 subtracted
// Otherwise window has gap between endpoint and where the first normal
// nta column starts
if(clip[0].enable == 0) return;
start = clip[0].left;
end = clip[0].right;
index = (index + clip[0].left) & nametable_row_mask;
}
vsr_shift = (which) ? 16 : 0;
vs = (uint32 *)&vsram[0];
y_scroll = (vs[0] >> vsr_shift) & 0xFFFF;
y_scroll = (line + (y_scroll & 0x3FF)) & playfield_row_mask;
v_line = (y_scroll & 7) << 3;
nt = (uint32 *)&vram[table + (((y_scroll >> 3) << playfield_shift) & y_mask)];
if(shift)
{
dst = (uint32 *)&buf[0x20-(0x10-shift)];
atbuf = nt[(index-1) & nametable_row_mask];
DRAW_COLUMN(atbuf, v_line)
}
buf = (buf + 0x20 + shift);
dst = (uint32 *)&buf[start<<4];
for(column = start; column < end; column += 1, index += 1)
{
atbuf = nt[index & nametable_row_mask];
DRAW_COLUMN(atbuf, v_line)
}
}
void render_ntx_im2(int which, int line, uint8 *buf)
{
int column;
int start, end;
int index;
int shift;
int nametable_row_mask = (playfield_col_mask >> 1);
int v_line;
uint32 atex, atbuf, *src, *dst;
uint16 xascroll, xbscroll, xscroll;
int y_scroll;
uint32 *nt;
int vsr_shift;
uint32 *vs;
uint16 table;
uint32 offs;
table = (which) ? ntbb : ntab;
get_hscroll(line, &xascroll, &xbscroll);
xscroll = (which) ? xbscroll : xascroll;
shift = (xscroll & 0x0F);
index = ((playfield_col_mask + 1) >> 1) - ((xscroll >> 4) & nametable_row_mask);
if(which)
{
start = 0;
end = (reg[0x0C] & 1) ? 20 : 16;
}
else
{
if(clip[0].enable == 0) return;
start = clip[0].left;
end = clip[0].right;
index = (index + clip[0].left) & nametable_row_mask;
}
vsr_shift = (which) ? 16 : 0;
vs = (uint32 *)&vsram[0];
y_scroll = (vs[0] >> vsr_shift) & 0xFFFF;
y_scroll = (line + ((y_scroll >> 1) & 0x3FF)) & playfield_row_mask;
v_line = (((y_scroll & 7) << 1) | ((status >> 4) & 1)) << 3;
nt = (uint32 *)&vram[table + (((y_scroll >> 3) << playfield_shift) & y_mask)];
if(shift)
{
dst = (uint32 *)&buf[0x20-(0x10-shift)];
atbuf = nt[(index-1) & nametable_row_mask];
DRAW_COLUMN_IM2(atbuf, v_line)
}
buf = (buf + 0x20 + shift);
dst = (uint32 *)&buf[start<<4];
for(column = start; column < end; column += 1, index += 1)
{
atbuf = nt[index & nametable_row_mask];
DRAW_COLUMN_IM2(atbuf, v_line)
}
}
void render_ntx_vs(int which, int line, uint8 *buf)
{
int column;
int start, end;
int index;
int shift;
int nametable_row_mask = (playfield_col_mask >> 1);
int v_line;
uint32 atex, atbuf, *src, *dst;
uint16 xascroll, xbscroll, xscroll;
int y_scroll;
uint32 *nt;
int vsr_shift;
uint32 *vs;
uint16 table;
table = (which) ? ntbb : ntab;
get_hscroll(line, &xascroll, &xbscroll);
xscroll = (which) ? xbscroll : xascroll;
shift = (xscroll & 0x0F);
index = ((playfield_col_mask + 1) >> 1) - ((xscroll >> 4) & nametable_row_mask);
if(which)
{
start = 0;
end = (reg[0x0C] & 1) ? 20 : 16;
}
else
{
if(clip[0].enable == 0) return;
start = clip[0].left;
end = clip[0].right;
index = (index + clip[0].left) & nametable_row_mask;
}
vsr_shift = (which) ? 16 : 0;
vs = (uint32 *)&vsram[0];
end = (reg[0x0C] & 1) ? 20 : 16;
if(shift)
{
dst = (uint32 *)&buf[0x20-(0x10-shift)];
y_scroll = (line & playfield_row_mask);
v_line = (y_scroll & 7) << 3;
nt = (uint32 *)&vram[table + (((y_scroll >> 3) << playfield_shift) & y_mask)];
atbuf = nt[(index-1) & nametable_row_mask];
DRAW_COLUMN(atbuf, v_line)
}
buf = (buf + 0x20 + shift);
dst = (uint32 *)&buf[start << 4];
for(column = start; column < end; column += 1, index += 1)
{
y_scroll = (vs[column] >> vsr_shift) & 0xFFFF;
y_scroll = (line + (y_scroll & 0x3FF)) & playfield_row_mask;
v_line = (y_scroll & 7) << 3;
nt = (uint32 *)&vram[table + (((y_scroll >> 3) << playfield_shift) & y_mask)];
atbuf = nt[index & nametable_row_mask];
DRAW_COLUMN(atbuf, v_line)
}
}
/*--------------------------------------------------------------------------*/
/* Helper functions (cache update, hscroll, window clip) */
/*--------------------------------------------------------------------------*/
void update_bg_pattern_cache(void)
{
int i;
uint8 x, y, c;
uint16 name;
if(!bg_list_index) return;
for(i = 0; i < bg_list_index; i += 1)
{
name = bg_name_list[i];
bg_name_list[i] = 0;
for(y = 0; y < 8; y += 1)
{
if(bg_name_dirty[name] & (1 << y))
{
uint8 *dst = &bg_pattern_cache[name << 6];
uint32 bp = *(uint32 *)&vram[(name << 5) | (y << 2)];
for(x = 0; x < 8; x += 1)
{
c = (bp >> ((x ^ 3) << 2)) & 0x0F;
dst[0x00000 | (y << 3) | (x)] = (c);
dst[0x20000 | (y << 3) | (x ^ 7)] = (c);
dst[0x40000 | ((y ^ 7) << 3) | (x)] = (c);
dst[0x60000 | ((y ^ 7) << 3) | (x ^ 7)] = (c);
}
}
}
bg_name_dirty[name] = 0;
}
bg_list_index = 0;
}
void get_hscroll(int line, uint16 *scrolla, uint16 *scrollb)
{
switch(reg[11] & 3)
{
case 0: /* Full-screen */
*scrolla = *(uint16 *)&vram[hscb + 0];
*scrollb = *(uint16 *)&vram[hscb + 2];
break;
case 1: /* First 8 lines */
*scrolla = *(uint16 *)&vram[hscb + ((line & 7) << 2) + 0];
*scrollb = *(uint16 *)&vram[hscb + ((line & 7) << 2) + 2];
break;
case 2: /* Every 8 lines */
*scrolla = *(uint16 *)&vram[hscb + ((line & ~7) << 2) + 0];
*scrollb = *(uint16 *)&vram[hscb + ((line & ~7) << 2) + 2];
break;
case 3: /* Every line */
*scrolla = *(uint16 *)&vram[hscb + (line << 2) + 0];
*scrollb = *(uint16 *)&vram[hscb + (line << 2) + 2];
break;
}
*scrolla &= 0x03FF;
*scrollb &= 0x03FF;
}
void window_clip(int line)
{
/* Window size and invert flags */
int hp = (reg[17] & 0x1F);
int hf = (reg[17] >> 7) & 1;
int vp = (reg[18] & 0x1F) << 3;
int vf = (reg[18] >> 7) & 1;
/* Display size */
int sw = (reg[12] & 1) ? 20 : 16;
/* Clear clipping data */
memset(&clip, 0, sizeof(clip));
/* Check if line falls within window range */
if(vf == (line >= vp))
{
/* Window takes up entire line */
clip[1].right = sw;
clip[1].enable = 1;
}
else
{
/* Perform horizontal clipping; the results are applied in reverse
if the horizontal inversion flag is set */
int a = hf;
int w = hf ^ 1;
if(hp)
{
if(hp > sw)
{
/* Plane W takes up entire line */
clip[w].right = sw;
clip[w].enable = 1;
}
else
{
/* Window takes left side, Plane A takes right side */
clip[w].right = hp;
clip[a].left = hp;
clip[a].right = sw;
clip[0].enable = clip[1].enable = 1;
}
}
else
{
/* Plane A takes up entire line */
clip[a].right = sw;
clip[a].enable = 1;
}
}
}
/*--------------------------------------------------------------------------*/
/* Look-up table functions */
/*--------------------------------------------------------------------------*/
/* Input (bx): d5-d0=color, d6=priority, d7=unused */
/* Input (ax): d5-d0=color, d6=priority, d7=unused */
/* Output: d5-d0=color, d6=priority, d7=unused */
int make_lut_bg(int bx, int ax)
{
int bf, bp, b;
int af, ap, a;
int x = 0;
int c;
bf = (bx & 0x7F);
bp = (bx >> 6) & 1;
b = (bx & 0x0F);
af = (ax & 0x7F);
ap = (ax >> 6) & 1;
a = (ax & 0x0F);
c = (ap ? (a ? af : (b ? bf : x)) : \
(bp ? (b ? bf : (a ? af : x)) : \
( (a ? af : (b ? bf : x)) )));
/* Strip palette bits from transparent pixels */
if((c & 0x0F) == 0x00) c = (c & 0xC0);
return (c);
}
/* Input (bx): d5-d0=color, d6=priority, d7=sprite pixel marker */
/* Input (sx): d5-d0=color, d6=priority, d7=unused */
/* Output: d5-d0=color, d6=zero, d7=sprite pixel marker */
int make_lut_obj(int bx, int sx)
{
int bf, bp, bs, b;
int sf, sp, s;
int c;
bf = (bx & 0x3F);
bs = (bx >> 7) & 1;
bp = (bx >> 6) & 1;
b = (bx & 0x0F);
sf = (sx & 0x3F);
sp = (sx >> 6) & 1;
s = (sx & 0x0F);
if(s == 0) return bx;
if(bs)
{
c = bf;
}
else
{
c = (sp ? (s ? sf : bf) : \
(bp ? (b ? bf : (s ? sf : bf)) : \
(s ? sf : bf) ));
}
/* Strip palette bits from transparent pixels */
if((c & 0x0F) == 0x00) c = (c & 0xC0);
return (c | 0x80);
}
/* Input (bx): d5-d0=color, d6=priority, d7=unused */
/* Input (sx): d5-d0=color, d6=priority, d7=unused */
/* Output: d5-d0=color, d6=priority, d7=intensity select (half/normal) */
int make_lut_bg_ste(int bx, int ax)
{
int bf, bp, b;
int af, ap, a;
int gi;
int x = 0;
int c;
bf = (bx & 0x7F);
bp = (bx >> 6) & 1;
b = (bx & 0x0F);
af = (ax & 0x7F);
ap = (ax >> 6) & 1;
a = (ax & 0x0F);
gi = (ap | bp) ? 0x80 : 0x00;
c = (ap ? (a ? af : (b ? bf : x )) : \
(bp ? (b ? bf : (a ? af : x )) : \
( (a ? af : (b ? bf : x)) )));
c |= gi;
/* Strip palette bits from transparent pixels */
if((c & 0x0F) == 0x00) c = (c & 0xC0);
return (c);
}
/* Input (bx): d5-d0=color, d6=priority, d7=sprite pixel marker */
/* Input (sx): d5-d0=color, d6=priority, d7=unused */
/* Output: d5-d0=color, d6=priority, d7=sprite pixel marker */
int make_lut_obj_ste(int bx, int sx)
{
int bf, bs;
int sf;
int c;
bf = (bx & 0x7F);
bs = (bx >> 7) & 1;
sf = (sx & 0x7F);
if((sx & 0x0F) == 0) return bx;
c = (bs) ? bf : sf;
/* Strip palette bits from transparent pixels */
if((c & 0x0F) == 0x00) c = (c & 0xC0);
return (c | 0x80);
}
/* Input (bx): d5-d0=color, d6=priority, d7=intensity (half/normal) */
/* Input (sx): d5-d0=color, d6=priority, d7=sprite marker */
/* Output: d5-d0=color, d6=intensity (half/normal), d7=(double/invalid) */
int make_lut_bgobj_ste(int bx, int sx)
{
int c;
int bf = (bx & 0x3F);
int bp = (bx >> 6) & 1;
int bi = (bx & 0x80) ? 0x40 : 0x00;
int b = (bx & 0x0F);
int sf = (sx & 0x3F);
int sp = (sx >> 6) & 1;
int si = (sx & 0x40);
int s = (sx & 0x0F);
if(bi & 0x40) si |= 0x40;
if(sp)
{
if(s)
{
if((sf & 0x3E) == 0x3E)
{
if(sf & 1)
{
c = (bf | 0x00);
}
else
{
c = (bx & 0x80) ? (bf | 0x80) : (bf | 0x40);
}
}
else
{
if(sf == 0x0E || sf == 0x1E || sf == 0x2E)
{
c = (sf | 0x40);
}
else
{
c = (sf | si);
}
}
}
else
{
c = (bf | bi);
}
}
else
{
if(bp)
{
if(b)
{
c = (bf | bi);
}
else
{
if(s)
{
if((sf & 0x3E) == 0x3E)
{
if(sf & 1)