mirror of https://github.com/bsnes-emu/bsnes.git
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
#include "decompressor.cpp"
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void SPC7110::dcu_load_address() {
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unsigned table = r4801 | r4802 << 8 | r4803 << 16;
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unsigned index = r4804 << 2;
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unsigned addr = table + index;
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dcu_mode = datarom_read(addr + 0);
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dcu_addr = datarom_read(addr + 1) << 16;
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dcu_addr |= datarom_read(addr + 2) << 8;
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dcu_addr |= datarom_read(addr + 3) << 0;
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}
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void SPC7110::dcu_begin_transfer() {
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if(dcu_mode == 3) return; //invalid mode
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add_clocks(20);
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decompressor->initialize(dcu_mode, dcu_addr);
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decompressor->decode();
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unsigned seek = r480b & 2 ? r4805 | r4806 << 8 : 0;
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while(seek--) decompressor->decode();
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r480c |= 0x80;
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dcu_offset = 0;
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}
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uint8 SPC7110::dcu_read() {
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if((r480c & 0x80) == 0) return 0x00;
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if(dcu_offset == 0) {
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for(unsigned row = 0; row < 8; row++) {
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switch(decompressor->bpp) {
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case 1:
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dcu_tile[row] = decompressor->result;
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break;
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case 2:
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dcu_tile[row * 2 + 0] = decompressor->result >> 0;
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dcu_tile[row * 2 + 1] = decompressor->result >> 8;
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break;
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case 4:
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dcu_tile[row * 2 + 0] = decompressor->result >> 0;
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dcu_tile[row * 2 + 1] = decompressor->result >> 8;
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dcu_tile[row * 2 + 16] = decompressor->result >> 16;
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dcu_tile[row * 2 + 17] = decompressor->result >> 24;
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break;
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}
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unsigned seek = r480b & 1 ? r4807 : 1;
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while(seek--) decompressor->decode();
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}
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}
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uint8 data = dcu_tile[dcu_offset++];
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dcu_offset &= 8 * decompressor->bpp - 1;
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return data;
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}
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