mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 07:17:45 -04:00
sms, improve vdp (mode 1, collision code cleanup)
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kub
parent
280bfc3ca7
commit
4dbd5223b1
1 changed files with 90 additions and 32 deletions
122
pico/mode4.c
122
pico/mode4.c
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@ -27,18 +27,21 @@ static int CollisionDetect(u8 *mb, u16 sx, unsigned int pack, int zoomed)
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0xc0,0xc3,0xcc,0xcf,0xf0,0xf3,0xfc,0xff };
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u8 *mp = mb + (sx>>3);
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unsigned col, m;
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// create a pixel bitmap of the sprite pixels from the 4 bitplanes in pack
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pack = ((pack | (pack>>16)) | ((pack | (pack>>16))>>8)) & 0xff;
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if (zoomed) pack = morton[pack&0x0f] | (morton[(pack>>4)&0x0f] << 8);
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// get the corresponding data from the sprite map
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m = mp[0] | (mp[1]<<8);
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if (zoomed) m |= (mp[2]<<16);
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// collision if bits in pixel bitmap overlap bits in sprite map
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col = m & (pack<<(sx&7));
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// update sprite map data with our pixel bitmap
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m |= pack<<(sx&7);
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mp[0] = m, mp[1] = m>>8;
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if (zoomed) mp[2] = m>>16;
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// check sprite map for collision and update map with current sprite
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if (!zoomed) { // 8 sprite pixels
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m = mp[0] | (mp[1]<<8);
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col = m & (pack<<(sx&7)); // collision if current sprite overlaps sprite map
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m |= pack<<(sx&7);
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mp[0] = m, mp[1] = m>>8;
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} else { // 16 sprite pixels in zoom mode
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pack = morton[pack&0x0f] | (morton[(pack>>4)&0x0f] << 8);
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m = mp[0] | (mp[1]<<8) | (mp[2]<<16);
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col = m & (pack<<(sx&7));
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m |= pack<<(sx&7);
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mp[0] = m, mp[1] = m>>8, mp[2] = m>>16;
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}
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// invisible overscan area, not tested for collision
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mb[0] = mb[33] = 0;
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return col;
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@ -53,7 +56,7 @@ static void TileBGM4(u16 sx, int pal)
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pd[0] = pd[1] = pal * 0x01010101;
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}
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// 8 pixels are arranged to have 1 bit in each byte of a 32 bit word. To pull
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// 8 pixels are arranged are arranged in 4 bitplanes in a 32 bit word. To pull
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// the 4 bitplanes together multiply with each bit distance (multiples of 1<<7)
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#define PLANAR_PIXELBG(x,p) \
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t = (pack>>(7-p)) & 0x01010101; \
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@ -191,6 +194,8 @@ static void DrawSpritesM4(int scanline)
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pack = CPU_LE2(*(u32 *)(PicoMem.vram + sprites_addr[s]));
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if (zoomed) TileDoubleSprM4(sprites_x[s], pack, 0x10);
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else TileNormSprM4(sprites_x[s], pack, 0x10);
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// make sprite pixel map by merging the 4 bitplanes
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pack = ((pack | (pack>>16)) | ((pack | (pack>>16))>>8)) & 0xff;
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if (!m) m = CollisionDetect(mb, sprites_x[s], pack, zoomed);
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}
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if (m)
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@ -209,20 +214,20 @@ static void DrawStripM4(const u16 *nametab, int cells_dx, int tilex_ty)
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unsigned int pack;
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unsigned code;
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code = nametab[tilex_ty& 0x1f];
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code = nametab[tilex_ty & 0x1f];
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if (code != oldcode) {
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oldcode = code;
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// Get tile address/2:
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addr = (code & 0x1ff) << 4;
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addr += tilex_ty>> 16;
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addr += tilex_ty >> 16;
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if (code & 0x0400)
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addr ^= 0xe; // Y-flip
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pal = (code>>7) & 0x30; // prio | palette select
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}
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pack = CPU_LE2(*(u32 *)(PicoMem.vram + addr)); /* Get 4 bitplanes / 8 pixels */
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pack = CPU_LE2(*(u32 *)(PicoMem.vram + addr)); // Get 4 bitplanes / 8 pixels
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if (pack == 0) TileBGM4(cells_dx, pal);
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else if (code & 0x0200) TileFlipBGM4(cells_dx, pack, pal);
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else TileNormBGM4(cells_dx, pack, pal);
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@ -296,17 +301,17 @@ static void DrawDisplayM4(int scanline)
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}
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/* Mode 2 */
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/*========*/
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/* TMS Modes */
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/*===========*/
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/* Background */
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/* Background, Graphics modes */
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#define TMS_PIXELBG(x,p) \
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t = (pack>>(7-p)) & 0x01; \
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t = (pal >> (t << 2)) & 0x0f; \
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pd[x] = t;
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static void TileNormBgM2(u16 sx, unsigned int pack, int pal)
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static void TileNormBgGr(u16 sx, unsigned int pack, int pal)
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{
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u8 *pd = Pico.est.HighCol + sx;
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unsigned int t;
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@ -328,7 +333,7 @@ static void TileNormBgM2(u16 sx, unsigned int pack, int pal)
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if (t) \
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pd[x] = pal;
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static void TileNormSprM2(u16 sx, unsigned int pack, int pal)
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static void TileNormSprTMS(u16 sx, unsigned int pack, int pal)
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{
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u8 *pd = Pico.est.HighCol + sx;
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unsigned int t;
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@ -343,7 +348,7 @@ static void TileNormSprM2(u16 sx, unsigned int pack, int pal)
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TMS_PIXELSP(7, 7)
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}
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static void TileDoubleSprM2(u16 sx, unsigned int pack, int pal)
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static void TileDoubleSprTMS(u16 sx, unsigned int pack, int pal)
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{
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u8 *pd = Pico.est.HighCol + sx;
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unsigned int t;
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@ -367,7 +372,7 @@ static void TileDoubleSprM2(u16 sx, unsigned int pack, int pal)
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}
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/* Draw sprites into a scanline, max 4 */
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static void DrawSpritesM2(int scanline)
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static void DrawSpritesTMS(int scanline)
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{
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struct PicoVideo *pv = &Pico.video;
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unsigned char mb[256/8+2] = {0};
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@ -425,14 +430,14 @@ static void DrawSpritesM2(int scanline)
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c = sat[MEM_LE2(i+3)] & 0x0f;
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if (x > 0) {
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pack = PicoMem.vramb[MEM_LE2(sprites_addr[s])];
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if (zoomed) TileDoubleSprM2(x, pack, c);
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else TileNormSprM2(x, pack, c);
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if (zoomed) TileDoubleSprTMS(x, pack, c);
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else TileNormSprTMS(x, pack, c);
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if (!m) m = CollisionDetect(mb, x, pack, zoomed);
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}
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if((pv->reg[1] & 0x2) && (x+=w) > 0) {
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pack = PicoMem.vramb[MEM_LE2(sprites_addr[s]+0x10)];
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if (zoomed) TileDoubleSprM2(x, pack, c);
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else TileNormSprM2(x, pack, c);
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if (zoomed) TileDoubleSprTMS(x, pack, c);
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else TileNormSprTMS(x, pack, c);
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if (!m) m = CollisionDetect(mb, x, pack, zoomed);
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}
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}
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@ -440,6 +445,9 @@ static void DrawSpritesM2(int scanline)
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pv->status |= SR_C;
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}
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/* Mode 2 */
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/*========*/
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/* Draw the background into a scanline; cells, dx, tilex, ty merged to reduce registers */
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static void DrawStripM2(const u8 *nametab, const u8 *coltab, const u8 *pattab, int cells_dx, int tilex_ty)
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{
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@ -449,10 +457,10 @@ static void DrawStripM2(const u8 *nametab, const u8 *coltab, const u8 *pattab, i
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unsigned int pack, pal;
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unsigned code;
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code = nametab[tilex_ty& 0x1f] << 3;
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code = nametab[tilex_ty & 0x1f] << 3;
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pal = coltab[code];
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pack = pattab[code];
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TileNormBgM2(cells_dx, pack, pal);
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TileNormBgGr(cells_dx, pack, pal);
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}
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}
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@ -484,7 +492,56 @@ static void DrawDisplayM2(int scanline)
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// sprites
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if (!(pv->debug_p & PVD_KILL_S_LO))
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DrawSpritesM2(scanline);
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DrawSpritesTMS(scanline);
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}
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/* Mode 1 */
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/*========*/
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/* Draw the background into a scanline; cells, dx, tilex, ty merged to reduce registers */
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static void DrawStripM1(const u8 *nametab, const u8 *coltab, const u8 *pattab, int cells_dx, int tilex_ty)
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{
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// Draw tiles across screen:
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for (; cells_dx > 0; cells_dx += 8, tilex_ty++, cells_dx -= 0x10000)
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{
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unsigned int pack, pal;
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unsigned code;
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code = nametab[tilex_ty & 0x1f];
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pal = coltab[code >> 3];
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pack = pattab[code << 3];
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TileNormBgGr(cells_dx, pack, pal);
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}
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}
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/* Draw a scanline */
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static void DrawDisplayM1(int scanline)
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{
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struct PicoVideo *pv = &Pico.video;
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u8 *nametab, *coltab, *pattab;
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int tilex, dx, cells;
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int cellskip = 0; // XXX
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int maxcells = 32;
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// name, color, pattern table:
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nametab = PicoMem.vramb + ((pv->reg[2]<<10) & 0x3c00);
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coltab = PicoMem.vramb + ((pv->reg[3]<< 6) & 0x3fc0);
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pattab = PicoMem.vramb + ((pv->reg[4]<<11) & 0x3800);
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nametab += (scanline>>3) << 5;
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pattab += (scanline & 0x7);
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tilex = cellskip & 0x1f;
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cells = maxcells - cellskip;
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dx = (cellskip << 3) + line_offset + 8;
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// tiles
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if (!(pv->debug_p & PVD_KILL_B))
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DrawStripM1(nametab, coltab, pattab, dx | (cells << 16), tilex | (scanline << 16));
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// sprites
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if (!(pv->debug_p & PVD_KILL_S_LO))
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DrawSpritesTMS(scanline);
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}
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@ -568,8 +625,9 @@ void PicoLineSMS(int line)
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// Draw screen:
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BackFill(Pico.video.reg[7] & 0x0f, 0, &Pico.est);
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if (Pico.video.reg[1] & 0x40) {
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if (Pico.video.reg[0] & 0x04) DrawDisplayM4(line);
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else DrawDisplayM2(line);
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if (Pico.video.reg[0] & 0x04) DrawDisplayM4(line);
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else if (Pico.video.reg[0] & 0x02) DrawDisplayM2(line);
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else DrawDisplayM1(line);
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}
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if (FinalizeLineSMS != NULL)
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