Prepare for new BG processors
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bcd80d291b
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67bcb6d508
259
core/vip.c
259
core/vip.c
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@ -54,6 +54,32 @@ static const uint8_t BRIGHT8[] = {
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/*********************************** Types ***********************************/
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/* World attribtues per eye */
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typedef struct {
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int32_t bp; /* BG source parallax */
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int32_t left, right; /* Window bounds */
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int32_t wx; /* World horizontal position */
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} EyeAttribs;
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/* Parsed world attributes */
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typedef struct {
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int32_t base; /* Base BG map index */
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uint8_t *bg; /* Background template */
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int32_t bgm; /* World type */
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int32_t bgw, bgh; /* Background dimension masks */
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int32_t bottom, top; /* Window bounds */
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int32_t gx, gp, gy; /* World screen position */
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int32_t mx, mp, my; /* Background scroll */
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int32_t over; /* Overplane flag */
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uint32_t params; /* Line parameters address */
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int32_t scx, scy; /* Background dimensions */
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int32_t w, h; /* Window size */
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} WorldAttribs;
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/***************************** Module Functions ******************************/
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/* Retrieve a pointer to character data in host memory */
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@ -597,6 +623,88 @@ static int vipEmulateDisplay(VB *sim, uint32_t clocks) {
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/****************************** Pixel Processor ******************************/
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/* Parse eye attributes and test window bounds */
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static int vipParseEye(WorldAttribs *wttr, EyeAttribs *ettr, int eye) {
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/* Validate the world isn't right of frame */
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ettr->wx = wttr->gx - (eye == 0 ? wttr->gp : -wttr->gp);
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if (ettr->wx > 383)
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return 1;
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ettr->left = ettr->wx < 0 ? 0 : ettr->wx;
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/* Validate the world isn't left of frame */
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ettr->right = ettr->wx + wttr->w - 1;
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if (ettr->right < 0)
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return 1;
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if (ettr->right > 383)
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ettr->right = 383;
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/* BG source parallax */
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if (wttr->bgm != 2)
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ettr->bp = eye == 0 ? -wttr->mp : wttr->mp;
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return 0;
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}
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/* Parse world attributes and test window bounds */
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static int vipParseWorld(VB*sim,uint8_t*world,uint16_t bits,WorldAttribs*attr){
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int32_t z; /* Scratch */
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/* Validate the world isn't below the frame */
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attr->gy = busReadBuffer(world + 6, VB_S16);
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if (attr->gy > 223)
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return 1;
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/* Validate the world isn't above the frame, and height is positive */
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attr->bgm = bits >> 12 & 3;
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attr->h = busReadBuffer(world + 16, VB_S16) + 1;
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z = attr->bgm == 2 ? 0 : 8;
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if (attr->h < z)
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attr->h = z;
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if (attr->h == 0)
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return 1;
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attr->bottom = attr->gy + attr->h - 1;
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attr->top = (int32_t) sim->vip.xp.sbcount << 3;
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if (attr->bottom < attr->top)
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return 1;
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if (attr->bottom > 223)
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attr->bottom = 223;
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if (attr->top < attr->gy)
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attr->top = attr->gy;
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/* Validate width is positive */
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attr->w = SignExtend(busReadBuffer(world + 14, VB_U16),
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attr->bgm == 2 ? 10 : 13) + 1;
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if (attr->w < 1)
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return 1;
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/* Parse attributes */
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attr->bg = (uint8_t *) BG_TEMPLATES[bits >> 8 & 15];
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attr->gx = SignExtend(busReadBuffer(world + 2, VB_U16), 10);
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attr->gp = SignExtend(busReadBuffer(world + 4, VB_U16), 10);
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attr->over = bits >> 7 & 1;
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attr->scx = bits >> 10 & 3;
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attr->scy = bits >> 8 & 3;
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attr->bgw = (1 << attr->scx) - 1;
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attr->bgh = (1 << attr->scy) - 1;
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z = attr->scx + attr->scy;
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attr->base = bits & 15 & ~((1 << (z < 3 ? z : 3)) - 1);
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if (attr->bgm != 2) {
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attr->mx = SignExtend(busReadBuffer(world + 8, VB_U16), 13);
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attr->mp = SignExtend(busReadBuffer(world + 10, VB_U16), 15);
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attr->my = SignExtend(busReadBuffer(world + 12, VB_U16), 13);
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}
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if (attr->bgm != 0) {
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attr->params =
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0x20000 +
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(attr->top - attr->gy) * (attr->bgm == 1 ? 4 : 16) +
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((uint32_t) busReadBuffer(world + 18, VB_U16) << 1)
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;
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}
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return 0;
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}
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/* Draw an object group into shadow memory */
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static void vipDrawObjects(VB *sim, int group) {
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uint8_t *dest; /* Pointer to object position in shadow memory */
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@ -687,124 +795,56 @@ static void vipDrawObjects(VB *sim, int group) {
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}
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/* Draw a background world into shadow memory */
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static void vipDrawWorld(VB *sim, uint8_t *world, uint16_t attr) {
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uint8_t *bg; /* Background arrangement */
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static void vipDrawWorld(VB *sim, uint8_t *world, uint16_t bits) {
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uint16_t bgAttr; /* BG map cell attributes */
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int32_t bgh; /* Height of background in BG maps, minus 1 */
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int32_t bgw; /* Width of background in BG maps, minus 1 */
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int32_t bottom; /* Window bottom edge position */
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int32_t bp; /* Eye BG map source parallax */
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int32_t bx; /* BG horizontal map source position */
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int32_t by; /* BG vertical map source position */
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int32_t bx; /* BG source X */
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int32_t by; /* BG source Y */
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uint8_t *cell; /* Pointer to BG map cell in host memory */
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uint8_t *chr; /* Pointer to character data in host memory */
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int32_t cx; /* BG cell/character horizontal pixel source position */
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int32_t cy; /* BG cell/character vertical pixel source position */
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int32_t cx; /* BG cell/character source X */
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int32_t cy; /* BG cell/character source Y */
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uint8_t *dest; /* Pointer to output in shadow memory */
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int32_t left; /* Window left edge position */
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EyeAttribs ettr; /* Eye attributes */
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uint32_t param; /* Current line parameter address */
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int8_t pixel; /* Character pixel value */
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int32_t right; /* Window right edge position */
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int32_t top; /* Window top edge position */
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int32_t wx; /* Eye horizontal position */
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int32_t i, x, y; /* Iterators */
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/* World attributes */
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int32_t base; /* BG map base index */
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int bgm; /* BG mode */
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WorldAttribs wttr; /* Common attributes */
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int32_t dx; /* Affine per-pixel X delta */
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int32_t dy; /* Affine per-pixel Y delta */
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int16_t gp; /* Window stereo parallax */
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int16_t gx; /* Window base horizontal position */
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int16_t gy; /* Window vertical position */
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int16_t h; /* Window height */
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int32_t mp; /* BG source parallax */
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int32_t mx; /* BG source X */
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int32_t my; /* BG source Y */
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int16_t hofst; /* H-bias shift */
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int32_t mp; /* BG map source stereo parallax */
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int32_t mx = 0; /* BG map horizontal source */
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int32_t my = 0; /* BG map vertical source */
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int32_t scx; /* Background width shift amount */
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int32_t scy; /* Background height shift amount */
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uint8_t *over; /* Pointer to overplane "cell" in host memory */
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uint32_t params = 0; /* Base address of line parameters */
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int16_t w; /* Window width */
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/* Validate the world isn't below the frame */
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gy = busReadBuffer(world + 6, VB_S16);
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if (gy > 223)
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return;
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/* Validate the world isn't above the frame, and height is positive */
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bgm = attr >> 12 & 3;
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y = bgm == 2 ? 0 : 8;
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h = busReadBuffer(world + 16, VB_S16) + 1;
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if (h < y)
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h = y;
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if (h == 0)
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return;
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bottom = gy + h - 1;
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top = (int32_t) sim->vip.xp.sbcount << 3;
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if (bottom < top)
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return;
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if (bottom > 223)
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bottom = 223;
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if (top < gy)
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top = gy;
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/* Validate width is positive */
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w = SignExtend(busReadBuffer(world + 14, VB_U16), bgm == 2 ? 10 : 13) + 1;
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if (w < 1)
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return;
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/* Working variables */
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ettr.bp = wttr.mp = wttr.mx = wttr.my = wttr.params = 0;
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/* Parse attributes */
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bg = (uint8_t *) BG_TEMPLATES[attr >> 8 & 15];
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gx = SignExtend(busReadBuffer(world + 2, VB_U16), 10);
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gp = SignExtend(busReadBuffer(world + 4, VB_U16), 10);
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over = (attr & 0x0080) ? world + 20 : NULL;
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scx = attr >> 10 & 3;
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scy = attr >> 8 & 3;
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bgw = (1 << scx) - 1;
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bgh = (1 << scy) - 1;
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base = attr & 15 & ~((1 << (scx + scy < 3 ? scx + scy : 3)) - 1);
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if (bgm != 2) {
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mx = SignExtend(busReadBuffer(world + 8, VB_U16), 13);
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mp = SignExtend(busReadBuffer(world + 10, VB_U16), 15);
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my = SignExtend(busReadBuffer(world + 12, VB_U16), 13);
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}
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if (bgm != 0) {
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params = 0x20000 + (top - gy) * (bgm == 1 ? 4 : 16) +
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((uint32_t) busReadBuffer(world + 18, VB_U16) << 1);
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}
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else hofst = 0;
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if (vipParseWorld(sim, world, bits, &wttr))
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return; /* Window not in frame */
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/* Draw the world */
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for (i = 0; i < 2; i++) {
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/* Validate world is enabled */
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if ((attr & (int32_t) 0x8000 >> i) == 0) /* LON, RON */
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/* World is not visible */
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if ((bits & (int32_t) 0x8000 >> i) == 0) /* LON, RON */
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continue;
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/* Validate the world isn't right of frame */
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wx = gx - (i == 0 ? gp : -gp);
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if (wx > 383)
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return;
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left = wx < 0 ? 0 : wx;
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/* Validate the world isn't left of frame */
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right = wx + w - 1;
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if (right < 0)
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return;
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if (right > 383)
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right = 383;
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/* BG source parallax */
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if (bgm != 2)
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bp = i == 0 ? -mp : mp;
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/* Process attributes */
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if (vipParseEye(&wttr, &ettr, i))
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continue;
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/* Draw all rows */
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for (y = top, param = params; y <= bottom; y++) {
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for (y = wttr.top, param = wttr.params; y <= wttr.bottom; y++) {
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/* Parse line parameters */
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switch (bgm) {
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hofst = 0;
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mp = wttr.mp;
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mx = wttr.mx;
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my = wttr.my;
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switch (wttr.bgm) {
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case 1: /* H-bias */
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hofst = SignExtend(vipParam(param | i << 1), 13);
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param += 4;
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@ -813,22 +853,22 @@ static void vipDrawWorld(VB *sim, uint8_t *world, uint16_t attr) {
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dx = (int32_t) (int16_t) vipParam(param|6) << 7;
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dy = (int32_t) (int16_t) vipParam(param|8) << 7;
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mp = (int32_t) (int16_t) vipParam(param|2);
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mp = left - wx - ((mp < 0) ^ i ? mp : 0);
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mp = ettr.left - ettr.wx - ((mp < 0) ^ i ? mp : 0);
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mx = ((int32_t) (int16_t) vipParam(param ) << 13) + dx*mp;
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my = ((int32_t) (int16_t) vipParam(param|4) << 13) + dy*mp;
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param += 16;
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}
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/* Select output in shadow memory */
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dest = &sim->vip.shadow[i][left * 224 + y];
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dest = &sim->vip.shadow[i][ettr.left * 224 + y];
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/* Draw all columns */
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for (x = left; x <= right; x++, dest += 224) {
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for (x = ettr.left; x <= ettr.right; x++, dest += 224) {
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/* Locate the pixel in the background */
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if (bgm != 2) { /* Normal, H-bias */
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cx = x - wx + mx + bp + hofst;
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cy = y - gy + my;
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if (wttr.bgm != 2) { /* Normal, H-bias */
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cx = x - ettr.wx + mx + ettr.bp + hofst;
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cy = y - wttr.gy + my;
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} else { /* Affine */
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cx = (int16_t) (mx >> 16);
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cy = (int16_t) (my >> 16);
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@ -842,22 +882,23 @@ static void vipDrawWorld(VB *sim, uint8_t *world, uint16_t attr) {
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cell = NULL;
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/* BG map is out of bounds */
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if (bx < 0 || bx > bgw || by < 0 || by > bgh) {
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if (over == NULL) {
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bx &= bgw;
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by &= bgh;
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}
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else {
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cell = over;
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if (
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bx < 0 || bx > wttr.bgw ||
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by < 0 || by > wttr.bgh
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) {
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if (wttr.over)
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continue; /* TODO: Research overplane */
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}
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bx &= wttr.bgw;
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by &= wttr.bgh;
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}
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/* Locate the cell in the BG map */
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if (cell == NULL) {
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cell = &sim->vip.ram[
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0x20000 |
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(base + bg[by << scx | bx]) << 13 |
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0x20000 | ((
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wttr.base +
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wttr.bg[by << wttr.scx | bx]
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) << 13) |
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(cy << 4 & 0x1F80) |
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(cx >> 2 & 0x007E)
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];
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