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VIP optimizations

This commit is contained in:
Guy Perfect 2024-11-19 21:56:44 -06:00
parent bc864644f7
commit c90b8137de
3 changed files with 639 additions and 322 deletions
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58
core/vb.c
View File

@ -8,8 +8,11 @@
/*********************************** Types ***********************************/ /*********************************** Types ***********************************/
/* Output image */ /* VIP BG map cell */
typedef uint8_t Pixels[2][384*224]; typedef struct {
uint8_t *palette; /* Points to a VB.vip.gplt */
uint8_t *pixels; /* Points to a VB.vip.characters */
} Cell;
/* VSU channel */ /* VSU channel */
typedef struct { typedef struct {
@ -69,6 +72,53 @@ typedef struct {
uint32_t until; /* Clocks until channel component update */ uint32_t until; /* Clocks until channel component update */
} Channel; } Channel;
/* VIP character (hflp << 1 | vflp) */
typedef uint8_t Character[4][64];
/* VIP object */
typedef struct {
Cell cell; /* BG map-like attributes */
int16_t jp; /* Parallax */
int16_t jx; /* Screen base X */
int16_t jy; /* Screen Y */
uint8_t lron; /* Visible in left and right images */
} Object;
/* Output image */
typedef uint8_t Pixels[2][384*224];
/* VIP world */
typedef struct {
/* Attributes */
uint8_t bgm; /* Mode */
uint8_t end; /* Control world */
int16_t gp; /* World parallax */
int16_t gx; /* World base X */
int16_t gy; /* World Y */
int16_t mx; /* Scroll base X */
int16_t mp; /* Scroll parallax */
int16_t my; /* Scroll Y */
uint8_t over; /* Use overplane */
Cell *overplane; /* Overplane cell */
/* Non-attributes */
Cell *bg[64]; /* Background arrangement */
int32_t bgHeight; /* Height of background in pixels */
uint32_t bgMaskX; /* Horizontal background mask */
uint32_t bgMaskY; /* Vertical background mask */
uint32_t bgShift; /* Bits to shift when selecting a BG map */
int32_t bgWidth; /* Width of background in pixels */
uint32_t hAffine; /* H for affine mode */
uint32_t hNaffine; /* H for not affine mode */
uint32_t height; /* Height of world in pixels */
uint8_t lron; /* Visible in left and right images */
uint32_t paramBase; /* H-bias and affine parameter address */
uint32_t wAffine; /* W for affine mode */
uint32_t wNaffine; /* W for not affine mode */
uint32_t width; /* Width of world in pixels */
} World;
/* Simulation state */ /* Simulation state */
struct VB { struct VB {
@ -280,7 +330,11 @@ struct VB {
Pixels shadow; /* Drawing shadow image, column-major */ Pixels shadow; /* Drawing shadow image, column-major */
/* Other state */ /* Other state */
Cell cells[0x10000]; /* Pre-computed BG map attributes */
Character characters[2048]; /* Pre-computed character pixels */
Object objects[1024]; /* Pre-computed object attributes */
uint8_t ram[0x40000]; /* Video memory */ uint8_t ram[0x40000]; /* Video memory */
World worlds[32]; /* Pre-computed world attributes */
} vip; } vip;
/* VSU */ /* VSU */

895
core/vip.c
View File

@ -56,37 +56,18 @@ static const uint8_t BRIGHT8[] = {
/*********************************** Types ***********************************/ /*********************************** Types ***********************************/
/* World attribtues per eye */ /* Intersection of the screen and a world rectangle */
typedef struct { typedef struct {
int32_t bp; /* BG source parallax */ int32_t x1; /* Left edge inclusive */
int32_t left, right; /* Window bounds */ int32_t x2; /* Right edge exclusive */
int32_t wx; /* World horizontal position */ int32_t y1; /* Top edge inclusive */
} EyeAttribs; int32_t y2; /* Bottom edge exclusive */
} Window;
/* Parsed world attributes */
typedef struct {
int32_t base; /* Base BG map index */
uint8_t *bg; /* Background template */
int32_t bgm; /* World type */
int32_t bgw, bgh; /* Background dimension masks */
int32_t bottom, top; /* Window bounds */
int32_t gx, gp, gy; /* World screen position */
int32_t mx, mp, my; /* Background scroll */
uint8_t *over; /* Overplane character */
uint32_t params; /* Line parameters address */
int32_t scx, scy; /* Background dimensions */
int32_t w, h; /* Window size */
} WorldAttribs;
/***************************** Module Functions ******************************/ /***************************** Module Functions ******************************/
/* Retrieve a pointer to character data in host memory */
static uint8_t* vipCharacter(VB *sim, uint32_t c) {
return &sim->vip.ram[0x06000 | (c << 6 & 0x18000) | (c << 4 & 0x01FF0)];
}
/* Read a palette */ /* Read a palette */
static int32_t vipReadPalette(uint8_t *entries) { static int32_t vipReadPalette(uint8_t *entries) {
return entries[3] << 6 | entries[2] << 4 | entries[1] << 2; return entries[3] << 6 | entries[2] << 4 | entries[1] << 2;
@ -244,6 +225,178 @@ static int32_t vipReadIO(VB *sim, uint32_t address, int type) {
value; value;
} }
/* Write into BG map cell memory */
static void vipWriteCell(VB *sim, uint32_t offset, int type, int32_t value) {
Cell *cell;
/* Adjustments for byte and word writes */
switch (type) {
case VB_S8:
case VB_U8:
value = offset & 1 ?
value << 8 | sim->vip.ram[0x20000 | offset] :
value | (int32_t) sim->vip.ram[0x20001 | offset] << 8
;
break;
case VB_S32:
vipWriteCell(sim, offset + 2, VB_U16, value >> 16);
break;
}
/* Update pixel pointer */
cell = &sim->vip.cells[offset >> 1];
cell->palette = sim->vip.gplt[value >> 14 & 3];
cell->pixels = sim->vip.characters[value & 0x07FF][value >> 12 & 3];
}
/* Write into character memory */
static void vipWriteChr(VB *sim, uint32_t offset, int type, int32_t value) {
Character *chr; /* Pixel state */
int b, l, r, t; /* Pixel bounds */
int x, y, X, Y; /* Iterators */
/* Byte advance by data type */
static const uint8_t HORZ[] = { 4, 4, 8, 8, 8 };
static const uint8_t VERT[] = { 8, 8, 8, 8, 16 };
/* Working variables */
chr = &sim->vip.characters[offset >> 4];
l = (offset & 0x1) << 2;
t = (offset & 0xE) << 2;
r = l + HORZ[type];
b = t + VERT[type];
/* Process all pixels */
for (y = t, Y = 56 - y; y < b; y += 8, Y -= 8)
for (x = l, X = 7 - x; x < r; x += 1, X -= 1, value >>= 2) {
(*chr)[0][y | x] = (*chr)[1][Y | x] =
(*chr)[2][y | X] = (*chr)[3][Y | X] = value & 3;
}
}
/* Write into object attribute memory */
static void vipWriteObject(VB *sim, uint32_t offset, int type, int32_t value) {
Object *obj; /* Object state */
/* Adjustments for byte and word writes */
switch (type) {
case VB_S8:
case VB_U8:
value = offset & 1 ?
value << 8 | sim->vip.ram[0x3E000 | offset] :
value | (int32_t) sim->vip.ram[0x3E001 | offset] << 8
;
break;
case VB_S32:
vipWriteObject(sim, offset + 2, VB_U16, value >> 16);
break;
}
/* Processing by offset */
obj = &sim->vip.objects[offset >> 3];
switch (offset >> 1 & 3) {
case 0: obj->jx = SignExtend(value, 10); break;
case 1:
obj->jp = SignExtend(value, 10);
obj->lron = value >> 14 & 3;
break;
case 2:
value = (int8_t) value;
obj->jy = value > -8 ? value : value & 0xFF;
break;
case 3:
obj->cell.palette = sim->vip.jplt[value >> 14 & 3];
obj->cell.pixels =
sim->vip.characters[value & 0x07FF][value >> 12 & 3];
}
}
/* Write into world attribute memory */
static void vipWriteWorld(VB *sim, uint32_t offset, int type, int32_t value) {
uint32_t base; /* Base BG map index */
uint8_t *bg; /* Background template */
uint32_t count; /* Number of BG maps in background */
World *world; /* World state */
uint32_t z; /* Iterator */
/* Adjustments for byte and word writes */
switch (type) {
case VB_S8:
case VB_U8:
value = offset & 1 ?
value << 8 | sim->vip.ram[0x3D800 | offset] :
value | (int32_t) sim->vip.ram[0x3D801 | offset] << 8
;
break;
case VB_S32:
vipWriteWorld(sim, offset + 2, VB_U16, value >> 16);
break;
}
/* Processing by offset */
world = &sim->vip.worlds[offset >> 5];
switch (offset >> 1 & 15) {
case 0:
/* Parse attributes */
world->lron = value >> 14 & 3;
world->bgm = value >> 12 & 3;
world->over = value >> 7 & 1;
world->end = value >> 6 & 1;
/* Update background fields */
z = value >> 10 & 3;
world->bgMaskX = (1 << z) - 1;
world->bgWidth = 512 << z;
world->bgShift = z;
z = value >> 8 & 3;
world->bgMaskY = (1 << z) - 1;
world->bgHeight = 512 << z;
/* Update world dimensions */
if (world->bgm != 2) {
world->height = world->hNaffine;
world->width = world->wNaffine;
} else {
world->height = world->hAffine;
world->width = world->wAffine;
}
/* Update background arrangement */
count = (world->bgMaskX + 1) * (world->bgMaskY + 1);
base = value & 15 & ~(count > 8 ? 7 : count - 1);
bg = (uint8_t *) BG_TEMPLATES[value >> 8 & 15];
for (z = 0; z < count; z++)
world->bg[z] = &sim->vip.cells[(base + bg[z]) << 12];
break;
case 1: world->gx = SignExtend(value, 10); break;
case 2: world->gp = SignExtend(value, 10); break;
case 3: world->gy = (int16_t) value; break;
case 4: world->mx = SignExtend(value, 13); break;
case 5: world->mp = SignExtend(value, 15); break;
case 6: world->my = SignExtend(value, 13); break;
case 7: /* W */
value = SignExtend(value, 13) + 1;
world->wNaffine = value < 0 ? 0 : value;
value = SignExtend(value, 10) + 1;
world->wAffine = value < 0 ? 0 : value;
world->width = world->bgm != 2 ? world->wNaffine : world->wAffine;
break;
case 8: /* H */
value = (int16_t) value + 1;
world->hNaffine = value < 8 ? 8 : value;
world->hAffine = value < 0 ? 0 : value;
world->height = world->bgm != 2 ? world->hNaffine : world->hAffine;
break;
case 9: world->paramBase = 0x20000|(uint32_t)(uint16_t)value<<1;break;
case 10: world->overplane = &sim->vip.cells[(uint16_t) value]; break;
}
}
/* Write a typed value to an I/O register */ /* Write a typed value to an I/O register */
static void vipWriteIO( static void vipWriteIO(
VB *sim, uint32_t address, int type, int32_t value, int debug) { VB *sim, uint32_t address, int type, int32_t value, int debug) {
@ -627,313 +780,352 @@ static int vipEmulateDisplay(VB *sim, uint32_t clocks) {
/****************************** Pixel Processor ******************************/ /****************************** Pixel Processor ******************************/
/* Parse eye attributes and test window bounds */ /* Draw a cell into shadow memory */
static int vipParseEye(WorldAttribs *wttr, EyeAttribs *ettr, int eye) { static void vipDrawCell(uint8_t *shadow, Window *wnd,
Cell *cell, int32_t x, int32_t y) {
uint8_t *col, *row; /* Output pixel */
uint8_t pixel; /* Character pixel value */
int32_t px1, px2, py1, py2; /* Pixel bounds in cell */
int32_t px, py; /* Pixel origin in cell */
/* Validate the world isn't right of frame */ /* Identify the visible pixels */
ettr->wx = wttr->gx - (eye == 0 ? wttr->gp : -wttr->gp); py1 = y > wnd->y1 ? y : wnd->y1;
if (ettr->wx > 383) py2 = y + 8 < wnd->y2 ? y + 8 : wnd->y2;
return 1; px1 = x > wnd->x1 ? x : wnd->x1;
ettr->left = ettr->wx < 0 ? 0 : ettr->wx; px2 = x + 8 < wnd->x2 ? x + 8 : wnd->x2;
/* Validate the world isn't left of frame */ /* Process all columns of pixels */
ettr->right = ettr->wx + wttr->w - 1; col = &shadow[px1 * 224 + py1];
if (ettr->right < 0) for (px = px1; px < px2; px++, col += 224)
return 1; for (py = py1, row = col; py < py2; py++, row++) {
if (ettr->right > 383) pixel = cell->pixels[(py - y) << 3 | (px - x)];
ettr->right = 383; if (pixel != 0)
*row = cell->palette[pixel];
/* BG source parallax */
if (wttr->bgm != 2)
ettr->bp = eye == 0 ? -wttr->mp : wttr->mp;
return 0;
} }
/* Parse world attributes and test window bounds */
static int vipParseWorld(VB*sim,uint8_t*world,uint16_t bits,WorldAttribs*attr){
int32_t z; /* Scratch */
/* Validate the world isn't below the frame */
attr->gy = busReadBuffer(world + 6, VB_S16);
if (attr->gy > 223)
return 1;
/* Validate the world isn't above the frame, and height is positive */
attr->bgm = bits >> 12 & 3;
attr->h = busReadBuffer(world + 16, VB_S16) + 1;
z = attr->bgm == 2 ? 0 : 8;
if (attr->h < z)
attr->h = z;
if (attr->h == 0)
return 1;
attr->bottom = attr->gy + attr->h - 1;
attr->top = (int32_t) sim->vip.xp.sbcount << 3;
if (attr->bottom < attr->top)
return 1;
if (attr->bottom > 223)
attr->bottom = 223;
if (attr->top < attr->gy)
attr->top = attr->gy;
/* Validate width is positive */
attr->w = SignExtend(busReadBuffer(world + 14, VB_U16),
attr->bgm == 2 ? 10 : 13) + 1;
if (attr->w < 1)
return 1;
/* Parse attributes */
attr->bg = (uint8_t *) BG_TEMPLATES[bits >> 8 & 15];
attr->gx = SignExtend(busReadBuffer(world + 2, VB_U16), 10);
attr->gp = SignExtend(busReadBuffer(world + 4, VB_U16), 10);
attr->over = (bits & 0x0080) == 0 ? NULL :
&sim->vip.ram[0x00020000 | busReadBuffer(world + 10, VB_U16) << 1];
attr->scx = bits >> 10 & 3;
attr->scy = bits >> 8 & 3;
attr->bgw = (1 << attr->scx) - 1;
attr->bgh = (1 << attr->scy) - 1;
z = attr->scx + attr->scy;
attr->base = bits & 15 & ~((1 << (z < 3 ? z : 3)) - 1);
if (attr->bgm != 2) {
attr->mx = SignExtend(busReadBuffer(world + 8, VB_U16), 13);
attr->mp = SignExtend(busReadBuffer(world + 10, VB_U16), 15);
attr->my = SignExtend(busReadBuffer(world + 12, VB_U16), 13);
}
if (attr->bgm != 0) {
attr->params =
0x20000 +
(attr->top - attr->gy) * (attr->bgm == 1 ? 4 : 16) +
((uint32_t) busReadBuffer(world + 18, VB_U16) << 1)
;
} }
return 0; /* Draw a BG map into shadow memory */
static void vipDrawBGMap(uint8_t *shadow, Window *wnd,
uint8_t over, Cell *map, int32_t x, int32_t y) {
Cell *col, *row; /* Source cell */
int32_t cx1, cx2, cy1, cy2; /* Cell bounds in BG map pixels */
int32_t cx, cy; /* Cell origin in BG map pixels */
/* Identify the visible cells */
cy1 = (wnd->y1-y ) & ~7; if (cy1 < 0) cy1 = 0; if (cy1 > 512) cy1 = 512;
cy2 = (wnd->y2-y+7) & ~7; if (cy2 < 0) cy2 = 0; if (cy2 > 512) cy2 = 512;
cx1 = (wnd->x1-x ) & ~7; if (cx1 < 0) cx1 = 0; if (cx1 > 512) cx1 = 512;
cx2 = (wnd->x2-x+7) & ~7; if (cx2 < 0) cx2 = 0; if (cx2 > 512) cx2 = 512;
/* Process all cells as overplane */
if (over) {
for (cy = cy1; cy < cy2; cy += 8)
for (cx = cx1; cx < cx2; cx += 8)
vipDrawCell(shadow, wnd, map, x + cx, y + cy);
return;
}
/* Process all cells normally */
row = &map[cy1 << 3 | cx1 >> 3];
for (cy = cy1 ; cy < cy2; cy += 8, row += 64)
for (cx = cx1, col = row; cx < cx2; cx += 8, col++)
vipDrawCell(shadow, wnd, col, x + cx, y + cy);
}
/* Draw a background into shadow memory */
static void vipDrawBackground(uint8_t *shadow, Window *wnd,
World *world, int32_t x, int32_t y) {
int32_t bx1, bx2, by1, by2; /* BG map bounds in background pixels */
int32_t bx, by; /* BG map origin in background pixels */
/* Identify the visible BG maps */
by1 = (wnd->y1 - y ) & ~511;
by2 = (wnd->y2 - y - 1) & ~511;
bx1 = (wnd->x1 - x ) & ~511;
bx2 = (wnd->x2 - x - 1) & ~511;
/* Process all rows of BG maps */
for (by = by1; by <= by2; by += 512) {
/* Row is out of bounds */
if (world->over && (by < 0 || by >= world->bgHeight)) {
for (bx = bx1; bx <= bx2; bx++)
vipDrawBGMap(shadow, wnd, 1, world->overplane, x + bx, y + by);
continue;
}
/* Process all columns of BG maps */
for (bx = bx1; bx <= bx2; bx += 512) {
/* Column is out of bounds */
if (world->over && (bx < 0 || bx >= world->bgWidth)) {
vipDrawBGMap(shadow, wnd, 1, world->overplane, x + bx, y + by);
continue;
}
/* Column is in bounds */
vipDrawBGMap(shadow, wnd, 0, world->bg[
(by >> 9 & world->bgMaskY) << world->bgShift |
(bx >> 9 & world->bgMaskX)
], x + bx, y + by);
}
}
}
/* Draw a Normal world into shadow memory */
static void vipDrawNormal(VB *sim, World *world) {
int32_t mx, my; /* Background origin */
Window wnd; /* Window bounds in pixels */
int i; /* Iterator */
/* No visible content */
if (world->width == 0)
return;
/* Vertical window bounds */
wnd.y1 = (int32_t) sim->vip.xp.sbcount << 3;
if (world->gy > wnd.y1)
wnd.y1 = world->gy;
if (wnd.y1 >= 224)
return;
wnd.y2 = wnd.y1 + world->height;
if (wnd.y2 <= 0)
return;
my = wnd.y1 - world->my;
if (wnd.y1 < 0)
wnd.y1 = 0;
if (wnd.y2 > 224)
wnd.y2 = 224;
/* Process both eyes */
for (i = 0; i < 2; i++) {
/* Check visibility */
if (!(world->lron >> (i ^ 1) & 1))
continue;
/* Horizontal window bounds */
wnd.x1 = world->gx + (i == 0 ? -world->gp : world->gp);
if (wnd.x1 >= 384)
continue;
wnd.x2 = wnd.x1 + world->width;
if (wnd.x2 <= 0)
continue;
mx = wnd.x1 - world->mx - (i == 0 ? -world->mp : world->mp);
if (wnd.x1 < 0)
wnd.x1 = 0;
if (wnd.x2 > 384)
wnd.x2 = 384;
/* Draw the background into the window */
vipDrawBackground(sim->vip.shadow[i], &wnd, world, mx, my);
}
}
/* Draw an H-bias world into shadow memory */
static void vipDrawHBias(VB *sim, World *world) {
int32_t mx, my; /* Background origin */
uint8_t *param; /* World parameter memory */
Window wnd; /* Window bounds in pixels */
int32_t y1, y2; /* Vertical window bounds */
int i, y; /* Iterators */
/* No visible content */
if (world->width == 0)
return;
/* Vertical window bounds */
y1 = (int32_t) sim->vip.xp.sbcount << 3;
if (world->gy > y1)
y1 = world->gy;
if (y1 >= 224)
return;
y2 = y1 + world->height;
if (y2 <= 0)
return;
my = y1 - world->my;
if (y1 < 0)
y1 = 0;
if (y2 > 224)
y2 = 224;
/* Process both eyes */
for (i = 0; i < 2; i++) {
/* Check visibility */
if (!(world->lron >> (i ^ 1) & 1))
continue;
/* Horizontal window bounds */
wnd.x1 = world->gx + (i == 0 ? -world->gp : world->gp);
if (wnd.x1 >= 384)
continue;
wnd.x2 = wnd.x1 + world->width;
if (wnd.x2 <= 0)
continue;
mx = wnd.x1 - world->mx - (i == 0 ? -world->mp : world->mp);
if (wnd.x1 < 0)
wnd.x1 = 0;
if (wnd.x2 > 384)
wnd.x2 = 384;
/* Process all visible lines */
param = &sim->vip.ram[world->paramBase +
((y1 - world->gy) << 2) + (i << 1)];
for (y = y1; y < y2; y++, param += 2) {
/* Configure window bounds */
wnd.y1 = y;
wnd.y2 = y + 1;
/* Draw the background into the window */
vipDrawBackground(sim->vip.shadow[i], &wnd, world,
mx + busReadBuffer(param, VB_S16), my);
}
}
}
/* Draw an Affine world into shadow memory */
static void vipDrawAffine(VB *sim, World *world) {
Cell *cell; /* Source cell */
uint8_t *col, *row; /* Output pixel */
uint8_t pixel; /* Character pixel value */
uint8_t *param; /* World parameter memory */
int32_t px, py; /* Pixel source coordinates */
int32_t dx, dy, mp, mx, my; /* Affine parameters */
int32_t wx; /* Base world X coordinate */
int32_t x1, x2, y1, y2; /* Window bounds */
int i, x, y; /* Iterators */
/* No visible content */
if (world->width == 0 || world->height == 0)
return;
/* Vertical window bounds */
y1 = (int32_t) sim->vip.xp.sbcount << 3;
if (world->gy > y1)
y1 = world->gy;
if (y1 >= 224)
return;
y2 = y1 + world->height;
if (y2 <= 0)
return;
if (y1 < 0)
y1 = 0;
if (y2 > 224)
y2 = 224;
/* Process both eyes */
for (i = 0; i < 2; i++) {
/* Check visibility */
if (!(world->lron >> (i ^ 1) & 1))
continue;
/* Horizontal window bounds */
x1 = world->gx + (i == 0 ? -world->gp : world->gp);
if (x1 >= 384)
continue;
x2 = x1 + world->width;
if (x2 <= 0)
continue;
wx = x1;
if (x1 < 0)
x1 = 0;
if (x2 > 384)
x2 = 384;
wx = x1 - wx;
/* Process all visible rows */
param = &sim->vip.ram[world->paramBase | (y1 - world->gy) << 4];
row = &sim->vip.shadow[i][x1 * 224 + y1];
for (y = y1; y < y2; y++, param += 16, row++) {
/* Parse line parameters */
mx = (int32_t) busReadBuffer(param + 0, VB_S16) << 6;
mp = (int32_t) busReadBuffer(param + 2, VB_S16);
my = (int32_t) busReadBuffer(param + 4, VB_S16) << 6;
dx = (int32_t) busReadBuffer(param + 6, VB_S16);
dy = (int32_t) busReadBuffer(param + 8, VB_S16);
/* Adjust left-edge parameters */
if ((mp < 0) ^ i) {
mx += dx * (wx - mp);
my += dy * (wx - mp);
} else {
mx += dx * wx;
my += dy * wx;
}
/* Process all visible columns */
col = row;
for (x = x1; x < x2; x++, mx += dx, my += dy, col += 224) {
px = (int16_t) (mx >> 9);
py = (int16_t) (my >> 9);
/* Overplane */
if (world->over && (
px < 0 || px >= world->bgWidth ||
py < 0 || py >= world->bgHeight
)) cell = world->overplane;
/* Regular */
else cell = &world->bg[
(py >> 9 & world->bgMaskY) << world->bgShift |
(px >> 9 & world->bgMaskX)
][(py << 3 & 0xFC0) | (px >> 3 & 63)];
/* Sample the pixel */
pixel = cell->pixels[(py & 7) << 3 | (px & 7)];
if (pixel != 0)
*col = cell->palette[pixel];
}
}
}
} }
/* Draw an object group into shadow memory */ /* Draw an object group into shadow memory */
static void vipDrawObjects(VB *sim, int group) { static void vipDrawObjects(VB *sim, int group) {
uint8_t *dest; /* Pointer to object position in shadow memory */ Object *obj; /* Object state */
int fx; /* Output horizontal position */ int start; /* First object in the group */
int fy; /* Output vertical position */ int stop; /* Last object in the group */
uint8_t *obj; /* Pointer to object attributes in host memory */ Window wnd; /* Window bounds in pixels */
int32_t ox; /* Eye horizontal position */ int i, o; /* Iterators */
int pixel; /* Character input pixel */
int start; /* Index of first object in group */
int stop; /* Index of last object in group */
int sx; /* Input horizontal position */
int sy; /* Input vertical position */
int32_t top; /* Window boundary */
int i, o, x, y; /* Iterators */
/* Object attributes */ /* Establish the viewing window */
uint32_t attr1; /* Attribute bits */ wnd.x1 = 0;
uint32_t attr2; /* Attribute bits */ wnd.y1 = (int32_t) sim->vip.xp.sbcount << 3;
int jhflp; /* Is flipped horizontally */ wnd.x2 = 384;
int32_t jp; /* Stereo parallax */ wnd.y2 = 224;
int jvflp; /* Is flipped vetically */
int32_t jx; /* Base horizontal position */
int32_t jy; /* Vertical position */
uint8_t *plt; /* Palette */
uint8_t *src; /* Pointer to character source data in host memory */
/* Process all objects in the group */ /* Process all objects in the group */
start = group == 0 ? 0 : (sim->vip.spt[group - 1] + 1) & 1023; start = group == 0 ? 0 : (sim->vip.spt[group - 1] + 1) & 1023;
stop = sim->vip.spt[group]; stop = sim->vip.spt[group];
top = (int32_t) sim->vip.xp.sbcount << 3;
for (o = stop; o != -1; o = o == start ? -1 : (o - 1) & 1023) { for (o = stop; o != -1; o = o == start ? -1 : (o - 1) & 1023) {
obj = &sim->vip.ram[0x3E000 | o << 3]; obj = &sim->vip.objects[o];
/* Validate object is enabled */
attr1 = busReadBuffer(obj + 2, VB_U16);
if ((attr1 & 0xC000) == 0) /* JLON, JRON */
continue;
/* Validate Y position */
jy = (int8_t) obj[4];
if (jy < 7)
jy &= 0xFF;
if (jy < top - 7 || jy > 223)
continue;
/* Parse attributes */
jx = SignExtend(busReadBuffer(obj, VB_U16), 10);
jp = SignExtend(attr1, 10);
attr2 = busReadBuffer(obj + 6, VB_U16);
jhflp = attr2 >> 13 & 1;
jvflp = attr2 >> 12 & 1;
/* Locate palette and character state in host memory */
plt = sim->vip.jplt[attr2 >> 14];
src = vipCharacter(sim, attr2);
/* Draw the character */
for (i = 0; i < 2; i++) { for (i = 0; i < 2; i++) {
if ((attr1 >> (15 - i) & 1) == 0) /* J*ON */ if (!(obj->lron >> (i ^ 1) & 1))
continue; continue;
ox = jx - (i == 0 ? jp : -jp); vipDrawCell(sim->vip.shadow[i], &wnd, &obj->cell,
dest = &sim->vip.shadow[i][ox * 224 + jy]; obj->jx + (i == 0 ? -obj->jp : obj->jp), obj->jy);
/* Draw all columns */
for (x = 0; x < 8; x++, dest += 224) {
fx = ox + x;
if (fx < 0 || fx > 383)
continue;
sx = jhflp ? 7 - x : x;
/* Draw all rows */
for (y = 0; y < 8; y++) {
fy = jy + y;
if (fy < top || fy > 223)
continue;
sy = jvflp ? 7 - y : y;
pixel = src[sy << 1 | sx >> 2] >> ((sx & 3) << 1) & 3;
if (pixel != 0)
dest[y] = plt[pixel]; /* TODO: Research clocks */
} /* y */
} /* x */
} /* i */
} }
} }
/* Draw a background world into shadow memory */
static void vipDrawWorld(VB *sim, uint8_t *world, uint16_t bits) {
uint16_t bgAttr; /* BG map cell attributes */
int32_t bx; /* BG source X */
int32_t by; /* BG source Y */
uint8_t *cell; /* Pointer to BG map cell in host memory */
uint8_t *chr; /* Pointer to character data in host memory */
int32_t cx; /* BG cell/character source X */
int32_t cy; /* BG cell/character source Y */
uint8_t *dest; /* Pointer to output in shadow memory */
EyeAttribs ettr; /* Eye attributes */
uint32_t param; /* Current line parameter address */
int8_t pixel; /* Character pixel value */
int32_t i, x, y; /* Iterators */
/* World attributes */
WorldAttribs wttr; /* Common attributes */
int32_t dx; /* Affine per-pixel X delta */
int32_t dy; /* Affine per-pixel Y delta */
int32_t mp; /* BG source parallax */
int32_t mx; /* BG source X */
int32_t my; /* BG source Y */
int16_t hofst; /* H-bias shift */
/* Working variables */
ettr.bp = wttr.mp = wttr.mx = wttr.my = wttr.params = 0;
/* Parse attributes */
if (vipParseWorld(sim, world, bits, &wttr))
return; /* Window not in frame */
/* Draw the world */
for (i = 0; i < 2; i++) {
/* World is not visible */
if ((bits & (int32_t) 0x8000 >> i) == 0) /* LON, RON */
continue;
/* Process attributes */
if (vipParseEye(&wttr, &ettr, i))
continue;
/* Draw all rows */
for (y = wttr.top, param = wttr.params; y <= wttr.bottom; y++) {
/* Parse line parameters */
hofst = 0;
mp = wttr.mp;
mx = wttr.mx;
my = wttr.my;
switch (wttr.bgm) {
case 1: /* H-bias */
hofst = SignExtend(vipParam(param | i << 1), 13);
param += 4;
break;
case 2: /* Affine */
dx = (int32_t) (int16_t) vipParam(param|6) << 7;
dy = (int32_t) (int16_t) vipParam(param|8) << 7;
mp = (int32_t) (int16_t) vipParam(param|2);
mp = ettr.left - ettr.wx - ((mp < 0) ^ i ? mp : 0);
mx = ((int32_t) (int16_t) vipParam(param ) << 13) + dx*mp;
my = ((int32_t) (int16_t) vipParam(param|4) << 13) + dy*mp;
param += 16;
}
/* Select output in shadow memory */
dest = &sim->vip.shadow[i][ettr.left * 224 + y];
/* Draw all columns */
for (x = ettr.left; x <= ettr.right; x++, dest += 224) {
/* Locate the pixel in the background */
if (wttr.bgm != 2) { /* Normal, H-bias */
cx = x - ettr.wx + mx + ettr.bp + hofst;
cy = y - wttr.gy + my;
} else { /* Affine */
cx = (int16_t) (mx >> 16);
cy = (int16_t) (my >> 16);
mx += dx;
my += dy;
}
/* Locate the BG map in the background */
bx = SignExtend(cx >> 9, 23);
by = SignExtend(cy >> 9, 23);
cell = NULL;
/* BG map is out of bounds */
if (
bx < 0 || bx > wttr.bgw ||
by < 0 || by > wttr.bgh
) {
if (wttr.over == NULL) {
bx &= wttr.bgw;
by &= wttr.bgh;
} else cell = wttr.over;
}
/* Locate the cell in the BG map */
if (cell == NULL) {
cell = &sim->vip.ram[
0x20000 | ((
wttr.base +
wttr.bg[by << wttr.scx | bx]
) << 13) |
(cy << 4 & 0x1F80) |
(cx >> 2 & 0x007E)
];
}
/* Extract the pixel from the character */
bgAttr = busReadBuffer(cell, VB_U16);
chr = vipCharacter(sim, bgAttr);
cx = (bgAttr & 0x2000 ? 7 - cx : cx) & 7;
cy = (bgAttr & 0x1000 ? 7 - cy : cy) & 7;
pixel = chr[cy << 1 | cx >> 2] >> ((cx & 3) << 1) & 3;
/* Write the pixel into shadow memory */
if (pixel != 0)
*dest = sim->vip.gplt[bgAttr >> 14 & 3][pixel];
} /* x */
} /* y */
} /* i */
} }
/* Draw the current graphics configuration into shadow memory */ /* Draw the current graphics configuration into shadow memory */
static void vipRender(VB *sim) { static void vipRender(VB *sim) {
uint16_t attr; /* World attribute bits */
int group; /* Next object group index */ int group; /* Next object group index */
uint16_t *timing; /* Column timing in host memory */ uint16_t *timing; /* Column timing in host memory */
uint8_t *world; /* World attribute source in host memory */ World *world; /* World attribute source in host memory */
int32_t x, y; /* Iterators */ int32_t x, y; /* Iterators */
/* Erase all pixels */ /* Erase all pixels */
@ -943,25 +1135,25 @@ static void vipRender(VB *sim) {
/* Process all worlds */ /* Process all worlds */
group = 3; group = 3;
world = &sim->vip.ram[0x3DBE0]; /* World 31 */ for (x = 31; x >= 0; x--) {
for (x = 31; x >= 0; x--, world -= 32) { world = &sim->vip.worlds[x];
attr = busReadBuffer(world, VB_U16);
/* Non-graphical world */ /* Non-graphical world */
if (attr & 0x0040) /* END */ if (world->end)
break; /* Control world */ break; /* Control world */
if ((attr & 0xC000) == 0) /* LON, RON */ if (world->lron == 0)
continue; /* Dummy world */ continue; /* Dummy world */
/* Object world */ /* Processing by world type */
if ((attr >> 12 & 3) == 3) { switch (world->bgm) {
case 0: vipDrawNormal(sim, world); break;
case 1: vipDrawHBias (sim, world); break;
case 2: vipDrawAffine(sim, world); break;
case 3:
vipDrawObjects(sim, group); vipDrawObjects(sim, group);
group = (group - 1) & 3; group = (group - 1) & 3;
} }
/* Background world */
else if (attr & 0xC000) /* LON, RON */
vipDrawWorld(sim, world, attr);
} }
/* /*
@ -1134,6 +1326,10 @@ static void vipRead(VB *sim, uint32_t address, int type, int32_t *value) {
/* Simulate a hardware reset */ /* Simulate a hardware reset */
static void vipReset(VB *sim) { static void vipReset(VB *sim) {
Cell *cell; /* BG map cell state */
Character *chr; /* Character state */
Object *obj; /* Object state */
World *world; /* World state */
int x, y; /* Iterators */ int x, y; /* Iterators */
/* Normal */ /* Normal */
@ -1159,6 +1355,53 @@ static void vipReset(VB *sim) {
sim->vip.jplt[x][y] = 0; sim->vip.jplt[x][y] = 0;
} }
} }
for (x = 0; x < 0x10000; x++) {
cell = &sim->vip.cells[x];
cell->palette = sim->vip.gplt[0];
cell->pixels = sim->vip.characters[0][0];
}
for (x = 0; x < 2048; x++) {
chr = &sim->vip.characters[x];
for (y = 0; y < 64; y++)
(*chr)[0][y] = (*chr)[1][y] = (*chr)[2][y] = (*chr)[3][y] = 0;
}
for (x = 0; x < 32; x++) {
world = &sim->vip.worlds[x];
world->bgm = 0;
world->end = 0;
world->gp = 0;
world->gx = 0;
world->gy = 0;
world->mx = 0;
world->mp = 0;
world->my = 0;
world->over = 0;
world->overplane = &sim->vip.cells[0];
for (y = 0; y < 64; y++)
world->bg[0] = world->overplane;
world->bgHeight = 512;
world->bgMaskX = 0;
world->bgMaskY = 0;
world->bgShift = 0;
world->bgWidth = 512;
world->hAffine = 0;
world->hNaffine = 0;
world->height = 8;
world->lron = 0;
world->paramBase = 0;
world->wAffine = 0;
world->wNaffine = 0;
world->width = 0;
}
for (x = 0; x < 1024; x++) {
obj = &sim->vip.objects[x];
obj->cell.palette = sim->vip.jplt[0];
obj->cell.pixels = sim->vip.characters[0][0];
obj->jp = 0;
obj->jx = 0;
obj->jy = 0;
obj->lron = 0;
}
/* Display processor extra (the hardware does not do this) */ /* Display processor extra (the hardware does not do this) */
sim->vip.dp.fclk = 0; sim->vip.dp.fclk = 0;
@ -1206,9 +1449,28 @@ static void vipWrite(VB*sim,uint32_t address,int type,int32_t value,int debug){
address &= 0x0007FFFF; address &= 0x0007FFFF;
/* RAM */ /* RAM */
if (address < 0x40000) if (address < 0x40000) {
busWriteBuffer(&sim->vip.ram[address], type, value); busWriteBuffer(&sim->vip.ram[address], type, value);
/* Character memory */
if ((address & 0x26000) == 0x06000) {
address = (address & 0x18000) >> 2 | (address & 0x01FFF);
vipWriteChr(sim, address, type, value);
}
/* BG map memory */
if (address >= 0x20000)
vipWriteCell(sim, address & 0x1FFFF, type, value);
/* World memory */
if ((address & 0x3FC00) == 0x3D800)
vipWriteWorld(sim, address &0x003FF, type, value);
/* Object memory */
if (address >= 0x3E000)
vipWriteObject(sim, address & 0x01FFF, type, value);
}
/* Unmapped */ /* Unmapped */
else if (address < 0x5E000) else if (address < 0x5E000)
; ;
@ -1223,6 +1485,7 @@ static void vipWrite(VB*sim,uint32_t address,int type,int32_t value,int debug){
/* Mirrors of character memory */ /* Mirrors of character memory */
else { else {
vipWriteChr(sim, address & 0x07FFF, type, value);
address = 0x06000 | (address << 2 & 0x18000) | (address & 0x01FFF); address = 0x06000 | (address << 2 & 0x18000) | (address & 0x01FFF);
busWriteBuffer(&sim->vip.ram[address], type, value); busWriteBuffer(&sim->vip.ram[address], type, value);
} }

4
core/vsu.c
View File

@ -74,7 +74,7 @@ static void vsuNextFreqMod(VB *sim, Channel *chan) {
} }
/* Process one channel */ /* Process one channel */
static void vsuEmulateChannel(VB *sim, Channel *chan, uint32_t clocks) { static void vsuEmulateChannel(VB *sim, Channel *chan) {
uint32_t bit; /* Pseudorandom bit */ uint32_t bit; /* Pseudorandom bit */
/* Automatic shutoff */ /* Automatic shutoff */
@ -343,7 +343,7 @@ static void vsuEmulate(VB *sim, uint32_t clocks) {
/* Update channel state */ /* Update channel state */
if (chan->until == 0) if (chan->until == 0)
vsuEmulateChannel(sim, chan, chan->until); vsuEmulateChannel(sim, chan);
} }
} }