1 // This is part of Pico Library
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3 // (c) Copyright 2006 notaz, All rights reserved.
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4 // Free for non-commercial use.
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6 // For commercial use, separate licencing terms must be obtained.
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9 // this is a frame-based renderer, alternative to Dave's line based which is in Draw.c
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12 #include "PicoInt.h"
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15 #pragma warning (disable:4706) // Disable assignment within conditional
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18 // port_config.h include must define these 2 defines:
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19 // #define START_ROW 1 // which row of tiles to start rendering at?
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20 // #define END_ROW 27 // ..end
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21 // one row means 8 pixels. If above example was used, (27-1)*8=208 lines would be rendered.
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23 #define TILE_ROWS END_ROW-START_ROW
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28 extern unsigned char *framebuff; // in format (8+320)x(8+224+8) (eights for borders)
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31 static int HighCacheA[41*(TILE_ROWS+1)+1+1]; // caches for high layers
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32 static int HighCacheB[41*(TILE_ROWS+1)+1+1];
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34 unsigned short *PicoCramHigh=Pico.cram; // pointer to CRAM buff (0x40 shorts), converted to native device color (works only with 16bit for now)
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35 void (*PicoPrepareCram)()=0; // prepares PicoCramHigh for renderer to use
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38 // stuff available in asm:
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40 void BackFillFull(int reg7);
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41 void DrawLayerFull(int plane, int *hcache, int planestart, int planeend);
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42 void DrawTilesFromCacheF(int *hc);
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43 void DrawWindowFull(int start, int end, int prio);
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44 void DrawSpriteFull(unsigned int *sprite);
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48 static int TileXnormYnorm(unsigned char *pd,int addr,unsigned char pal)
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50 unsigned int pack=0; unsigned int t=0, blank = 1;
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53 for(i=8; i; i--, addr+=2, pd += 320+8) {
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54 pack=*(unsigned int *)(Pico.vram+addr); // Get 8 pixels
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57 t=pack&0x0000f000; if (t) pd[0]=(unsigned char)((t>>12)|pal);
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58 t=pack&0x00000f00; if (t) pd[1]=(unsigned char)((t>> 8)|pal);
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59 t=pack&0x000000f0; if (t) pd[2]=(unsigned char)((t>> 4)|pal);
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60 t=pack&0x0000000f; if (t) pd[3]=(unsigned char)((t )|pal);
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61 t=pack&0xf0000000; if (t) pd[4]=(unsigned char)((t>>28)|pal);
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62 t=pack&0x0f000000; if (t) pd[5]=(unsigned char)((t>>24)|pal);
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63 t=pack&0x00f00000; if (t) pd[6]=(unsigned char)((t>>20)|pal);
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64 t=pack&0x000f0000; if (t) pd[7]=(unsigned char)((t>>16)|pal);
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68 return blank; // Tile blank?
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71 static int TileXflipYnorm(unsigned char *pd,int addr,unsigned char pal)
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73 unsigned int pack=0; unsigned int t=0, blank = 1;
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76 for(i=8; i; i--, addr+=2, pd += 320+8) {
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77 pack=*(unsigned int *)(Pico.vram+addr); // Get 8 pixels
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80 t=pack&0x000f0000; if (t) pd[0]=(unsigned char)((t>>16)|pal);
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81 t=pack&0x00f00000; if (t) pd[1]=(unsigned char)((t>>20)|pal);
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82 t=pack&0x0f000000; if (t) pd[2]=(unsigned char)((t>>24)|pal);
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83 t=pack&0xf0000000; if (t) pd[3]=(unsigned char)((t>>28)|pal);
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84 t=pack&0x0000000f; if (t) pd[4]=(unsigned char)((t )|pal);
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85 t=pack&0x000000f0; if (t) pd[5]=(unsigned char)((t>> 4)|pal);
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86 t=pack&0x00000f00; if (t) pd[6]=(unsigned char)((t>> 8)|pal);
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87 t=pack&0x0000f000; if (t) pd[7]=(unsigned char)((t>>12)|pal);
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90 return blank; // Tile blank?
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93 static int TileXnormYflip(unsigned char *pd,int addr,unsigned char pal)
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95 unsigned int pack=0; unsigned int t=0, blank = 1;
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99 for(i=8; i; i--, addr-=2, pd += 320+8) {
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100 pack=*(unsigned int *)(Pico.vram+addr); // Get 8 pixels
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101 if(!pack) continue;
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103 t=pack&0x0000f000; if (t) pd[0]=(unsigned char)((t>>12)|pal);
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104 t=pack&0x00000f00; if (t) pd[1]=(unsigned char)((t>> 8)|pal);
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105 t=pack&0x000000f0; if (t) pd[2]=(unsigned char)((t>> 4)|pal);
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106 t=pack&0x0000000f; if (t) pd[3]=(unsigned char)((t )|pal);
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107 t=pack&0xf0000000; if (t) pd[4]=(unsigned char)((t>>28)|pal);
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108 t=pack&0x0f000000; if (t) pd[5]=(unsigned char)((t>>24)|pal);
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109 t=pack&0x00f00000; if (t) pd[6]=(unsigned char)((t>>20)|pal);
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110 t=pack&0x000f0000; if (t) pd[7]=(unsigned char)((t>>16)|pal);
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114 return blank; // Tile blank?
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117 static int TileXflipYflip(unsigned char *pd,int addr,unsigned char pal)
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119 unsigned int pack=0; unsigned int t=0, blank = 1;
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123 for(i=8; i; i--, addr-=2, pd += 320+8) {
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124 pack=*(unsigned int *)(Pico.vram+addr); // Get 8 pixels
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125 if(!pack) continue;
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127 t=pack&0x000f0000; if (t) pd[0]=(unsigned char)((t>>16)|pal);
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128 t=pack&0x00f00000; if (t) pd[1]=(unsigned char)((t>>20)|pal);
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129 t=pack&0x0f000000; if (t) pd[2]=(unsigned char)((t>>24)|pal);
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130 t=pack&0xf0000000; if (t) pd[3]=(unsigned char)((t>>28)|pal);
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131 t=pack&0x0000000f; if (t) pd[4]=(unsigned char)((t )|pal);
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132 t=pack&0x000000f0; if (t) pd[5]=(unsigned char)((t>> 4)|pal);
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133 t=pack&0x00000f00; if (t) pd[6]=(unsigned char)((t>> 8)|pal);
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134 t=pack&0x0000f000; if (t) pd[7]=(unsigned char)((t>>12)|pal);
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137 return blank; // Tile blank?
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141 // start: (tile_start<<16)|row_start, end: [same]
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142 static void DrawWindowFull(int start, int end, int prio)
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144 struct PicoVideo *pvid=&Pico.video;
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145 int nametab, nametab_step, trow, tilex, blank=-1, code;
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146 unsigned char *scrpos = framebuff;
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147 int tile_start, tile_end; // in cells
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150 tile_start = start>>16;
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151 tile_end = end>>16;
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152 start = start<<16>>16;
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155 // Find name table line:
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156 if (pvid->reg[12]&1)
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158 nametab=(pvid->reg[3]&0x3c)<<9; // 40-cell mode
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159 nametab_step = 1<<6;
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163 nametab=(pvid->reg[3]&0x3e)<<9; // 32-cell mode
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164 nametab_step = 1<<5;
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166 nametab += nametab_step*start;
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169 code=Pico.vram[nametab+tile_start];
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170 if ((code>>15) != prio) return; // hack: just assume that whole window uses same priority
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173 scrpos+=8*328*(start-START_ROW);
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175 // do a window until we reach planestart row
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176 for(trow = start; trow < end; trow++, nametab+=nametab_step) { // current tile row
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177 for (tilex=tile_start; tilex<tile_end; tilex++)
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179 int code,addr,zero=0;
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180 // unsigned short *pal=NULL;
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183 code=Pico.vram[nametab+tilex];
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184 if (code==blank) continue;
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186 // Get tile address/2:
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187 addr=(code&0x7ff)<<4;
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189 // pal=PicoCramHigh+((code>>9)&0x30);
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190 pal=(unsigned char)((code>>9)&0x30);
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192 switch((code>>11)&3) {
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193 case 0: zero=TileXnormYnorm(scrpos+(tilex<<3),addr,pal); break;
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194 case 1: zero=TileXflipYnorm(scrpos+(tilex<<3),addr,pal); break;
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195 case 2: zero=TileXnormYflip(scrpos+(tilex<<3),addr,pal); break;
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196 case 3: zero=TileXflipYflip(scrpos+(tilex<<3),addr,pal); break;
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198 if(zero) blank=code; // We know this tile is blank now
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206 static void DrawLayerFull(int plane, int *hcache, int planestart, int planeend)
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208 struct PicoVideo *pvid=&Pico.video;
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209 static char shift[4]={5,6,6,7}; // 32,64 or 128 sized tilemaps
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210 int width, height, ymask, htab;
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211 int nametab, hscroll=0, vscroll, cells;
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212 unsigned char *scrpos;
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213 int blank=-1, xmask, nametab_row, trow;
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216 cells = (planeend>>16)-(planestart>>16);
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217 planestart = planestart<<16>>16;
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218 planeend = planeend<<16>>16;
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220 // Work out the Tiles to draw
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222 htab=pvid->reg[13]<<9; // Horizontal scroll table address
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223 // if ( pvid->reg[11]&2) htab+=Scanline<<1; // Offset by line
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224 // if ((pvid->reg[11]&1)==0) htab&=~0xf; // Offset by tile
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225 htab+=plane; // A or B
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227 if(!(pvid->reg[11]&3)) { // full screen scroll
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228 // Get horizontal scroll value
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229 hscroll=Pico.vram[htab&0x7fff];
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230 htab = 0; // this marks that we don't have to update scroll value
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233 // Work out the name table size: 32 64 or 128 tiles (0-3)
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234 width=pvid->reg[16];
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235 height=(width>>4)&3; width&=3;
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237 xmask=(1<<shift[width ])-1; // X Mask in tiles
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238 ymask=(height<<5)|0x1f; // Y Mask in tiles
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239 if(width == 1) ymask&=0x3f;
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240 else if(width>1) ymask =0x1f;
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242 // Find name table:
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243 if (plane==0) nametab=(pvid->reg[2]&0x38)<< 9; // A
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244 else nametab=(pvid->reg[4]&0x07)<<12; // B
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246 scrpos = framebuff;
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247 scrpos+=8*328*(planestart-START_ROW);
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249 // Get vertical scroll value:
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250 vscroll=Pico.vsram[plane]&0x1ff;
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251 scrpos+=(8-(vscroll&7))*328;
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252 if(vscroll&7) planeend++; // we have vertically clipped tiles due to vscroll, so we need 1 more row
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254 *hcache++ = 8-(vscroll&7); // push y-offset to tilecache
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257 for(trow = planestart; trow < planeend; trow++) { // current tile row
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258 int cellc=cells,tilex,dx;
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260 // Find the tile row in the name table
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261 //ts.line=(vscroll+Scanline)&ymask;
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262 //ts.nametab+=(ts.line>>3)<<shift[width];
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263 nametab_row = nametab + (((trow+(vscroll>>3))&ymask)<<shift[width]); // pointer to nametable entries for this row
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265 // update hscroll if needed
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267 int htaddr=htab+(trow<<4);
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268 if(trow) htaddr-=(vscroll&7)<<1;
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269 hscroll=Pico.vram[htaddr&0x7fff];
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272 // Draw tiles across screen:
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273 tilex=(-hscroll)>>3;
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274 dx=((hscroll-1)&7)+1;
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275 if(dx != 8) cellc++; // have hscroll, do more cells
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277 for (; cellc; dx+=8,tilex++,cellc--)
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279 int code=0,addr=0,zero=0;
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280 // unsigned short *pal=NULL;
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283 code=Pico.vram[nametab_row+(tilex&xmask)];
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284 if (code==blank) continue;
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287 if (code>>15) { // high priority tile
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288 *hcache++ = code|(dx<<16)|(trow<<27); // cache it
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290 if ((code>>15) != currpri) {
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295 // Get tile address/2:
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296 addr=(code&0x7ff)<<4;
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298 // pal=PicoCramHigh+((code>>9)&0x30);
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299 pal=(unsigned char)((code>>9)&0x30);
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301 switch((code>>11)&3) {
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302 case 0: zero=TileXnormYnorm(scrpos+dx,addr,pal); break;
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303 case 1: zero=TileXflipYnorm(scrpos+dx,addr,pal); break;
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304 case 2: zero=TileXnormYflip(scrpos+dx,addr,pal); break;
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305 case 3: zero=TileXflipYflip(scrpos+dx,addr,pal); break;
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307 if(zero) blank=code; // We know this tile is blank now
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313 *hcache = 0; // terminate cache
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317 static void DrawTilesFromCacheF(int *hc)
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319 int code, addr, zero = 0;
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320 unsigned int prevy=0xFFFFFFFF;
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321 // unsigned short *pal;
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323 short blank=-1; // The tile we know is blank
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324 unsigned char *scrpos = framebuff, *pd = 0;
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326 // *hcache++ = code|(dx<<16)|(trow<<27); // cache it
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327 scrpos+=(*hc++)*328 - START_ROW*328*8;
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329 while((code=*hc++)) {
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330 if((short)code == blank) continue;
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333 if(((unsigned)code>>27) != prevy) {
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334 prevy = (unsigned)code>>27;
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335 pd = scrpos + prevy*328*8;
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338 // Get tile address/2:
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339 addr=(code&0x7ff)<<4;
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340 // pal=PicoCramHigh+((code>>9)&0x30);
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341 pal=(unsigned char)((code>>9)&0x30);
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343 switch((code>>11)&3) {
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344 case 0: zero=TileXnormYnorm(pd+((code>>16)&0x1ff),addr,pal); break;
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345 case 1: zero=TileXflipYnorm(pd+((code>>16)&0x1ff),addr,pal); break;
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346 case 2: zero=TileXnormYflip(pd+((code>>16)&0x1ff),addr,pal); break;
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347 case 3: zero=TileXflipYflip(pd+((code>>16)&0x1ff),addr,pal); break;
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350 if(zero) blank=(short)code;
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355 // sx and sy are coords of virtual screen with 8pix borders on top and on left
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356 static void DrawSpriteFull(unsigned int *sprite)
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358 int width=0,height=0;
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359 // unsigned short *pal=NULL;
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361 int tile,code,tdeltax,tdeltay;
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362 unsigned char *scrpos;
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367 sy=(sy&0x1ff)-0x78; // Y
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368 width=(height>>2)&3; height&=3;
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369 width++; height++; // Width and height in tiles
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372 sx=((code>>16)&0x1ff)-0x78; // X
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374 tile=code&0x7ff; // Tile number
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375 tdeltax=height; // Delta to increase tile by going right
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376 tdeltay=1; // Delta to increase tile by going down
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377 if (code&0x0800) { tdeltax=-tdeltax; tile+=height*(width-1); } // Flip X
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378 if (code&0x1000) { tdeltay=-tdeltay; tile+=height-1; } // Flip Y
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380 //delta<<=4; // Delta of address
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381 // pal=PicoCramHigh+((code>>9)&0x30); // Get palette pointer
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382 pal=(unsigned char)((code>>9)&0x30);
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384 // goto first vertically visible tile
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385 while(sy <= START_ROW*8) { sy+=8; tile+=tdeltay; height--; }
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387 scrpos = framebuff;
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388 scrpos+=(sy-START_ROW*8)*328;
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390 for (; height > 0; height--, sy+=8, tile+=tdeltay)
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392 int w = width, x=sx, t=tile;
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394 if(sy >= END_ROW*8+8) return; // offscreen
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396 for (; w; w--,x+=8,t+=tdeltax)
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399 if(x>=328) break; // Offscreen
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401 t&=0x7fff; // Clip tile address
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402 switch((code>>11)&3) {
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403 case 0: TileXnormYnorm(scrpos+x,t<<4,pal); break;
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404 case 1: TileXflipYnorm(scrpos+x,t<<4,pal); break;
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405 case 2: TileXnormYflip(scrpos+x,t<<4,pal); break;
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406 case 3: TileXflipYflip(scrpos+x,t<<4,pal); break;
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416 static void DrawAllSpritesFull(int prio, int maxwidth)
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418 struct PicoVideo *pvid=&Pico.video;
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419 int table=0,maskrange=0;
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421 unsigned int *sprites[80]; // Sprites
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422 int y_min=START_ROW*8, y_max=END_ROW*8; // for a simple sprite masking
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424 table=pvid->reg[5]&0x7f;
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425 if (pvid->reg[12]&1) table&=0x7e; // Lowest bit 0 in 40-cell mode
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426 table<<=8; // Get sprite table address/2
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428 for (i=u=0; u < 80; u++)
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430 unsigned int *sprite=NULL;
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431 int code, code2, sx, sy, height;
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433 sprite=(unsigned int *)(Pico.vram+((table+(link<<2))&0x7ffc)); // Find sprite
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438 // check if it is not hidden vertically
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439 sy = (code&0x1ff)-0x80;
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440 height = (((code>>24)&3)+1)<<3;
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441 if(sy+height <= y_min || sy > y_max) goto nextsprite;
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445 sx = (code2>>16)&0x1ff;
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447 int to = sy+height; // sy ~ from
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449 // try to merge with previous range
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450 if((maskrange>>16)+1 >= sy && (maskrange>>16) <= to && (maskrange&0xffff) < sy) sy = (maskrange&0xffff);
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451 else if((maskrange&0xffff)-1 <= to && (maskrange&0xffff) >= sy && (maskrange>>16) > to) to = (maskrange>>16);
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453 // support only very simple masking (top and bottom of screen)
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454 if(sy <= y_min && to+1 > y_min) y_min = to+1;
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455 else if(to >= y_max && sy-1 < y_max) y_max = sy-1;
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456 else maskrange=sy|(to<<16);
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462 if(((code2>>15)&1) != prio) goto nextsprite; // wrong priority
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464 // check if sprite is not hidden horizontally
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465 sx -= 0x78; // Get X coordinate + 8
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466 if(sx <= -8*3 || sx >= maxwidth) goto nextsprite;
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468 // sprite is good, save it's index
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469 sprites[i++]=sprite;
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472 // Find next sprite
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473 link=(code>>16)&0x7f;
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474 if(!link) break; // End of sprites
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477 // Go through sprites backwards:
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478 for (i-- ;i>=0; i--)
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480 DrawSpriteFull(sprites[i]);
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484 #ifndef _ASM_DRAW_C
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485 static void BackFillFull(int reg7)
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487 unsigned int back, i;
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488 unsigned int *p=(unsigned int *)framebuff;
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490 // Start with a background color:
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491 // back=PicoCramHigh[reg7&0x3f];
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496 for(i = (8+320)*(8+(END_ROW-START_ROW)*8)/16; i; i--) {
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497 *p++ = back; // do 16 pixels per iteration
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505 static void DrawDisplayFull()
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507 struct PicoVideo *pvid=&Pico.video;
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508 int win, edge=0, hvwin=0; // LSb->MSb: hwin&plane, vwin&plane, full
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509 int planestart=START_ROW, planeend=END_ROW; // plane A start/end when window shares display with plane A (in tile rows or columns)
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510 int winstart=START_ROW, winend=END_ROW; // same for window
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511 int maxw, maxcolc; // max width and col cells
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513 if(pvid->reg[12]&1) {
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514 maxw = 328; maxcolc = 40;
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516 maxw = 264; maxcolc = 32;
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519 // horizontal window?
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520 if((win=pvid->reg[0x12])) {
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521 hvwin=1; // hwindow shares display with plane A
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524 // fullscreen window
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526 } else if(win < 0x80) {
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527 // window on the top
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528 if(edge <= START_ROW) hvwin=0; // window not visible in our drawing region
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529 else if(edge >= END_ROW) hvwin=4;
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530 else planestart = winend = edge;
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531 } else if(win > 0x80) {
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532 // window at the bottom
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533 if(edge >= END_ROW) hvwin=0;
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534 else planeend = winstart = edge;
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538 // check for vertical window, but only if win is not fullscreen
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540 win=pvid->reg[0x11];
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544 else if(edge < (maxcolc>>1)) {
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545 // window is on the right
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547 planeend|=edge<<17;
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548 winstart|=edge<<17;
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549 winend|=maxcolc<<16;
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552 if(edge >= (maxcolc>>1)) hvwin=4;
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554 // window is on the left
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557 planestart|=edge<<17;
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558 planeend|=maxcolc<<16;
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563 if(hvwin==1) { winend|=maxcolc<<16; planeend|=maxcolc<<16; }
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566 DrawLayerFull(1, HighCacheB, START_ROW, (maxcolc<<16)|END_ROW);
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569 // fullscreen window
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570 DrawWindowFull(START_ROW, (maxcolc<<16)|END_ROW, 0);
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575 // we have plane A and both v and h windows
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576 DrawLayerFull(0, HighCacheA, planestart, planeend);
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577 DrawWindowFull( winstart&~0xff0000, (winend&~0xff0000)|(maxcolc<<16), 0); // h
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578 DrawWindowFull((winstart&~0xff)|START_ROW, (winend&~0xff)|END_ROW, 0); // v
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583 // both window and plane A visible, window is vertical XOR horizontal
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584 DrawLayerFull(0, HighCacheA, planestart, planeend);
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585 DrawWindowFull(winstart, winend, 0);
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589 // fullscreen plane A
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590 DrawLayerFull(0, HighCacheA, START_ROW, (maxcolc<<16)|END_ROW);
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593 DrawAllSpritesFull(0, maxw);
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596 if(HighCacheB[1]) DrawTilesFromCacheF(HighCacheB);
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597 if(HighCacheA[1]) DrawTilesFromCacheF(HighCacheA);
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600 // fullscreen window
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601 DrawWindowFull(START_ROW, (maxcolc<<16)|END_ROW, 1);
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605 // we have plane A and both v and h windows
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606 DrawWindowFull( winstart&~0xff0000, (winend&~0xff0000)|(maxcolc<<16), 1); // h
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607 DrawWindowFull((winstart&~0xff)|START_ROW, (winend&~0xff)|END_ROW, 1); // v
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612 // both window and plane A visible, window is vertical XOR horizontal
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613 DrawWindowFull(winstart, winend, 1);
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620 DrawAllSpritesFull(1, maxw);
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624 void PicoFrameFull()
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627 if(PicoPrepareCram) PicoPrepareCram();
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630 BackFillFull(Pico.video.reg[7]);
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631 if (Pico.video.reg[1]&0x40) DrawDisplayFull();
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