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/** |
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* S->C: map1a <coord1>[darkness1][face1a][face1b][face1c]<coord2>[darkness2][face2a]... |
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* |
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* This is an update of the map command to support large map sizes. |
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* The old map command supported a maximum map size of 15x15 - |
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* anything larger than that required a new command. |
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* |
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* Given that this larger map now needs 2 bytes for the coordinates - |
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* the same as for the images, trying to optimize one vs the other |
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* does not makes much sense. |
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* |
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* The map1a is an enhancement to the map1 command. |
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* |
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* All data is in standard binary form. |
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*/ |
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void |
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command_parser::on_map1a (std::istream &args) |
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{ |
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while (args.peek () != EOF) |
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{ |
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// the coord values are flags + x + y values. The value itself, but |
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// the data represented looks like this: |
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u16 const coord = read_u16 (args); |
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|
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// first 6 bits: The x coordinate |
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s16 const coord_x = (coord >> 10) & 63; |
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// next 6 bits: the y coordinate |
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s16 const coord_y = (coord >> 4) & 63; |
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// last 4 bits: MSB - true if we send darkness |
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// MSB-1 - will send floor face |
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// MSB-2 - will send intermediate face |
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// MSB-3 (aka LSB) - will send top face |
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u08 const flags = coord & 15; |
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|
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s16 const x = map.x + coord_x; |
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s16 const y = map.y + coord_y; |
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|
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auto &cell = map (x, y); |
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|
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if (flags) |
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{ |
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if (!cell.darkness) |
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cell.darkness = 256; |
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|
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if (flags & 8) |
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{ |
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if (setup.extmap) |
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{ |
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u08 ext; |
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|
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do |
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{ |
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ext = read_u08 (args); |
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u08 const cmd = ext & 0x7f; |
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|
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if (cmd < 4) |
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cell.darkness = 255 - ext * 64 + 1; |
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if (cmd == 5) // health |
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{ |
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cell.stat_width = 1; |
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cell.stat_hp = read_u08 (args); |
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} |
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else if (cmd == 6) // monster width |
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{ |
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cell.stat_width = read_u08 (args) + 1; |
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} |
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else if (cmd == 0x47) |
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{ |
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u08 bytes = read_u08 (args); |
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switch (bytes) |
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{ |
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case 1: |
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cell.player = read_u08 (args); |
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break; |
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case 2: |
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cell.player = read_u16 (args); |
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break; |
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case 3: |
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cell.player = read_u24 (args); |
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break; |
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case 4: |
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cell.player = read_u32 (args); |
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break; |
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default: |
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args.ignore (bytes); |
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break; |
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} |
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} |
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else if (cmd == 8) // cell flags |
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cell.flags = read_u08 (args); |
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else if (ext & 0x40) // unknown, multibyte => skip |
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args.ignore (read_u08 (args)); |
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} |
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while (ext & 0x80); |
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} |
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else // no extmap |
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cell.darkness = read_u08 (args); |
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} |
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|
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for (int z = 0; z < 3; ++z) |
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if (flags & (4 >> z)) |
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cell.face[z] = read_u16 (args); |
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} |
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else |
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{ |
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// If all the flag values are 0, this then means the space is considered |
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// blocked from view, and should be drawn as black. This conserves |
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// bandwidth for sending blocked spaces, which occur pretty frequently. |
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// Once a space is marked as block, if it re-appears within view, the 3 |
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// layers should be marked is blank. |
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cell.clear (); |
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} |
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|
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assert (args); |
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} |
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PARSE_END; |
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|
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emit map (map); |
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} |
