Optimize scrolling to not redraw tiles when not needed
This commit is contained in:
parent
c2d648d284
commit
d676190aaf
98
testbed.c
98
testbed.c
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@ -391,7 +391,7 @@ int tifLoad(FILE *f, TifImageMeta_t meta, unsigned int *planeBuf, int maxY, int
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unsigned int *rp = gp + planeStride;
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unsigned int *rp = gp + planeStride;
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unsigned int *ip = rp + planeStride;
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unsigned int *ip = rp + planeStride;
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unsigned int *mp = ip + planeStride;
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unsigned int *mp = ip + planeStride;
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unsigned char bv, gv, rv, iv;
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unsigned int bv, gv, rv, iv;
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if (meta.width > MAX_WIDTH || (meta.width % 16) != 0 || planes < 4 || planes > 5) {
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if (meta.width > MAX_WIDTH || (meta.width % 16) != 0 || planes < 4 || planes > 5) {
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return 0;
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return 0;
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@ -412,7 +412,7 @@ int tifLoad(FILE *f, TifImageMeta_t meta, unsigned int *planeBuf, int maxY, int
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int gpair = (pixelpair & 0x02) >> 1 | (pixelpair & 0x20) >> 4;
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int gpair = (pixelpair & 0x02) >> 1 | (pixelpair & 0x20) >> 4;
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int rpair = (pixelpair & 0x04) >> 2 | (pixelpair & 0x40) >> 5;
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int rpair = (pixelpair & 0x04) >> 2 | (pixelpair & 0x40) >> 5;
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int ipair = (pixelpair & 0x08) >> 3 | (pixelpair & 0x80) >> 6;
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int ipair = (pixelpair & 0x08) >> 3 | (pixelpair & 0x80) >> 6;
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int shift = (3 - (ipixelpair % 4)) << 1;
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int shift = (7 - (ipixelpair % 8)) << 1;
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bv |= bpair << shift;
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bv |= bpair << shift;
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gv |= gpair << shift;
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gv |= gpair << shift;
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@ -425,7 +425,8 @@ int tifLoad(FILE *f, TifImageMeta_t meta, unsigned int *planeBuf, int maxY, int
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*rp++ = rv;
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*rp++ = rv;
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*ip++ = iv;
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*ip++ = iv;
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if (planes == 5) {
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if (planes == 5) {
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*mp++ = bv & gv & rv & iv;
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iv = ~(bv & gv & rv & iv);
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*mp++ = iv;
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}
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}
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bv = gv = rv = iv = 0;
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bv = gv = rv = iv = 0;
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}
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}
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@ -448,6 +449,18 @@ int tifLoad(FILE *f, TifImageMeta_t meta, unsigned int *planeBuf, int maxY, int
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/*** T I L E S ***/
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/*** T I L E S ***/
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// Tiles are 16x16 bitmaps, stored as arrays of words.
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// Each tile has 4 or 5 planes (depending on whether it is a tile or sprite)
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// which are stored adjacant to each other; ie. a 16-word array of blue,
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// followed by a 16-word array of green, etc.
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// Tiles in RAM are stored byte-swapped to aid in fast bit-shifting, and must
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// be byte-swapped before being written to video memory.
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// Because bit-shifting operations happen on little-endian words:
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// 01234567 89ABCDEF << 3 => 34567XXX BCDEF012
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// which is wrong. So instead we do:
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// 89ABCDEF 01234567 << 3 => BCDEFXXX 3456789A byteswap => 3456789A BCDEFXXX
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#define PAGE_TILES_W 21
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#define PAGE_TILES_W 21
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#define PAGE_TILES_H 13
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#define PAGE_TILES_H 13
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#define PAGE_TILES_COUNT (PAGE_TILES_H * PAGE_TILES_W)
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#define PAGE_TILES_COUNT (PAGE_TILES_H * PAGE_TILES_W)
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@ -503,6 +516,7 @@ void loadMap(unsigned char *map, unsigned int w, unsigned int h) {
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screen.map = map;
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screen.map = map;
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screen.w = w;
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screen.w = w;
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screen.h = h;
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screen.h = h;
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memset(screen.dirty, D_BGTILE, PAGE_TILES_COUNT * 2);
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}
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}
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int prepareBuffer(int pageX, int pageY) {
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int prepareBuffer(int pageX, int pageY) {
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@ -523,6 +537,7 @@ int prepareBuffer(int pageX, int pageY) {
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void drawSpriteToBuf(unsigned int *sprite, int pageX, int pageY, int shift, int yStart) {
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void drawSpriteToBuf(unsigned int *sprite, int pageX, int pageY, int shift, int yStart) {
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unsigned int *buf, *mask;
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unsigned int *buf, *mask;
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unsigned int maskval;
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int y, h, plane;
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int y, h, plane;
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if (pageX < 0 || pageY < 0 ||
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if (pageX < 0 || pageY < 0 ||
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pageX >= PAGE_TILES_W || pageY >= PAGE_TILES_H ||
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pageX >= PAGE_TILES_W || pageY >= PAGE_TILES_H ||
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@ -532,19 +547,20 @@ void drawSpriteToBuf(unsigned int *sprite, int pageX, int pageY, int shift, int
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}
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}
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buf = screen.buffer[prepareBuffer(pageX, pageY)];
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buf = screen.buffer[prepareBuffer(pageX, pageY)];
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/* if (yStart < 0) {
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if (yStart < 0) {
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sprite = &sprite[-yStart];
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sprite = &sprite[-yStart];
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h = yStart + 16;
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h = yStart + 16;
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} else {
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} else {
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buf = &buf[yStart];
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buf = &buf[yStart];
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h = 16 - yStart;
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h = 16 - yStart;
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}
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}
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mask = &sprite[16 * 4];
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mask = &sprite[BUF_WSTRIDE * 4];
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if (shift < 0) {
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if (shift < 0) {
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shift = -shift;
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shift = -shift;
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for (plane = 0; plane < 4; plane ++) {
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for (plane = 0; plane < 4; plane ++) {
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for (y = 0; y < h; y ++) {
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for (y = 0; y < h; y ++) {
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buf[y] = (buf[y] & ~(mask[y] << shift)) | (sprite[y] << shift);
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maskval = mask[y] << shift;
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buf[y] = (buf[y] & ~maskval) | ((sprite[y] << shift) & maskval);
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}
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}
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sprite += BUF_WSTRIDE;
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sprite += BUF_WSTRIDE;
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buf += BUF_WSTRIDE;
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buf += BUF_WSTRIDE;
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@ -552,12 +568,13 @@ void drawSpriteToBuf(unsigned int *sprite, int pageX, int pageY, int shift, int
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} else {
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} else {
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for (plane = 0; plane < 4; plane ++) {
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for (plane = 0; plane < 4; plane ++) {
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for (y = 0; y < h; y ++) {
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for (y = 0; y < h; y ++) {
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buf[y] = (buf[y] & ~(mask[y] >> shift)) | (sprite[y] >> shift);
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maskval = mask[y] >> shift;
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buf[y] = (buf[y] & ~maskval) | ((sprite[y] >> shift) & maskval);
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}
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}
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sprite += BUF_WSTRIDE;
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sprite += BUF_WSTRIDE;
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buf += BUF_WSTRIDE;
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buf += BUF_WSTRIDE;
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}
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}
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}*/
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}
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}
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}
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void drawSprite(unsigned int *sprite, int x, int y) {
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void drawSprite(unsigned int *sprite, int x, int y) {
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@ -572,15 +589,32 @@ void drawSprite(unsigned int *sprite, int x, int y) {
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drawSpriteToBuf(sprite, pageX + 1, pageY + 1, pageOffsetX - 16, pageOffsetY - 16);
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drawSpriteToBuf(sprite, pageX + 1, pageY + 1, pageOffsetX - 16, pageOffsetY - 16);
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}
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}
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void scroll(int x, int y) {
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void scroll(int newX, int newY) {
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x = min(max(x, 0), (screen.w << 4) - 320);
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newX = min(max(newX, 0), (screen.w << 4) - 320);
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y = min(max(y, 0), (screen.h << 4) - 176);
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newY = min(max(newY, 0), (screen.h << 4) - 176);
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if ((screen.scrollX & 0xfff0) != (x & 0xfff0) ||
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if ((screen.scrollX & 0xfff0) != (newX & 0xfff0) ||
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(screen.scrollY & 0xfff0) != (y & 0xfff0)) {
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(screen.scrollY & 0xfff0) != (newY & 0xfff0)) {
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memset(screen.dirty, D_BGTILE, 2 * PAGE_TILES_COUNT);
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int mapX, mapY;
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unsigned char page;
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for (page = 0; page < 2; page ++) {
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int mapOffsetOld = (screen.scrollX >> 4) + ((screen.scrollY >> 4) * screen.w);
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int mapOffsetNew = (newX >> 4) + ((newY >> 4) * screen.w);
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unsigned char *dirty = screen.dirty[page];
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for (mapY = 0; mapY < PAGE_TILES_H; mapY ++) {
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for (mapX = 0; mapX < PAGE_TILES_W; mapX ++) {
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if (*dirty != D_NOTHING ||
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screen.map[mapOffsetOld + mapX] != screen.map[mapOffsetNew + mapX]) {
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*dirty = D_BGTILE;
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}
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}
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screen.scrollX = x;
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dirty ++;
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screen.scrollY = y;
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}
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mapOffsetNew += screen.w;
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mapOffsetOld += screen.w;
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}
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}
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}
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screen.scrollX = newX;
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screen.scrollY = newY;
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}
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}
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void drawScreen() {
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void drawScreen() {
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@ -591,7 +625,7 @@ void drawScreen() {
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unsigned int drawOffset = screen.pageOffset[screen.currentPage];
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unsigned int drawOffset = screen.pageOffset[screen.currentPage];
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unsigned int scrollOffset = drawOffset + (offsetX >> 3) + (offsetY * PAGE_STRIDE);
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unsigned int scrollOffset = drawOffset + (offsetX >> 3) + (offsetY * PAGE_STRIDE);
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unsigned char *dirty = screen.dirty[screen.currentPage];
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unsigned char *dirty = screen.dirty[screen.currentPage];
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unsigned int x, y, di, plane;
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unsigned int x, y, di, plane, bmp;
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setAllPlanes();
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setAllPlanes();
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setWriteMode(1);
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setWriteMode(1);
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@ -600,7 +634,9 @@ void drawScreen() {
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for (y = startY; y < startY + PAGE_TILES_H; y ++) {
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for (y = startY; y < startY + PAGE_TILES_H; y ++) {
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for (x = startX; x < startX + PAGE_TILES_W; x ++) {
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for (x = startX; x < startX + PAGE_TILES_W; x ++) {
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if (dirty[di++] == D_BGTILE) {
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if (dirty[di++] == D_BGTILE) {
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blitTile(screen.tilesOffset + screen.map[x + (y * screen.w)], drawOffset);
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blitTile(
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screen.tilesOffset + (screen.map[x + (y * screen.w)] << 5),
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drawOffset);
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}
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}
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drawOffset += 2;
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drawOffset += 2;
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}
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}
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@ -612,7 +648,8 @@ void drawScreen() {
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for (di = screen.firstBuffer; di != screen.nextBuffer; di = nextBufferIndex(di)) {
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for (di = screen.firstBuffer; di != screen.nextBuffer; di = nextBufferIndex(di)) {
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drawOffset = screen.bufferOffset[di] >> 1;
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drawOffset = screen.bufferOffset[di] >> 1;
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for (y = 0; y < 16; y ++) {
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for (y = 0; y < 16; y ++) {
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WVID[drawOffset] = screen.buffer[di][y + (BUF_WSTRIDE * plane)];
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bmp = screen.buffer[di][y + (BUF_WSTRIDE * plane)];
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WVID[drawOffset] = (bmp << 8) | (bmp >> 8);
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drawOffset += PAGE_STRIDE >> 1;
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drawOffset += PAGE_STRIDE >> 1;
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}
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}
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}
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}
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@ -630,9 +667,10 @@ void drawScreen() {
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#define NUM_TILES 128
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#define NUM_TILES 128
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#define NUM_SPRITES 64
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#define NUM_SPRITES 64
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#define OFF_TILES 0x4840
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#define OFF_TILES 0x4840
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#define TILE_STRIDE 64
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unsigned int tiles[NUM_TILES][4*16];
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#define SPRITE_STRIDE 80
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unsigned int sprites[NUM_SPRITES][5*16];
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unsigned int tiles[NUM_TILES * TILE_STRIDE];
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unsigned int sprites[NUM_SPRITES * SPRITE_STRIDE];
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unsigned char map[10000];
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unsigned char map[10000];
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@ -643,7 +681,7 @@ void fillMap() {
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for (y = 0; y < 100; y ++) {
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for (y = 0; y < 100; y ++) {
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for (x = 0; x < 100; x ++) {
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for (x = 0; x < 100; x ++) {
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map[x + (y * 100)] = (((x + y + z) >> 2) % 4) << 5;
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map[x + (y * 100)] = ((x + y + z) >> 2) % 4;
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}
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}
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}
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}
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}
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}
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@ -665,8 +703,8 @@ void game_init() {
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f = fopen("TILES.TIF", "rb");
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f = fopen("TILES.TIF", "rb");
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meta = tifLoadMeta(f);
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meta = tifLoadMeta(f);
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tifLoadEGA(f, meta, OFF_TILES, NUM_TILES * 16, 16);
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tifLoad(f, meta, tiles, NUM_TILES * 16, 16, 4);
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tifLoad(f, meta, tiles, NUM_TILES * 16, 16, 4);
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tifLoadEGA(f, meta, OFF_TILES, NUM_TILES * 16, 16);
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fclose(f);
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fclose(f);
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f = fopen("SPRITE.TIF", "rb");
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f = fopen("SPRITE.TIF", "rb");
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@ -691,13 +729,13 @@ int main() {
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while (!keyPressed(K_ESC)) {
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while (!keyPressed(K_ESC)) {
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if (keyPressed(K_LEFT)) x -= 1;
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if (keyPressed(K_LEFT)) x -= 3;
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if (keyPressed(K_RIGHT)) x += 1;
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if (keyPressed(K_RIGHT)) x += 3;
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if (keyPressed(K_UP)) y -= 1;
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if (keyPressed(K_UP)) y -= 3;
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if (keyPressed(K_DOWN)) y += 1;
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if (keyPressed(K_DOWN)) y += 3;
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scroll(x - 152, y - 90);
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scroll(x - 152, y - 90);
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drawSprite(sprites[0], 50, 50);
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drawSprite(&sprites[0 * SPRITE_STRIDE], 50, 50);
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drawSprite(sprites[1], x, y);
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drawSprite(&sprites[1 * SPRITE_STRIDE], x, y);
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drawScreen();
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drawScreen();
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z++;
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z++;
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BIN
testbed.exe
BIN
testbed.exe
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