mirror of https://github.com/nmlgc/ReC98.git
59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
#pragma option -zCSHARED
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#include "th04/formats/cdg_impl.hpp"
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void pascal cdg_put_noalpha_8(screen_x_t left, vram_y_t top, int slot)
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{
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#define cdg reinterpret_cast<CDG near *>(_SI)
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#define tmp static_cast<upixel_t>(_AX)
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#define cdg_dword_w static_cast<vram_byte_amount_t>(_BP)
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#define dst_offset static_cast<vram_byte_amount_t>(_BX)
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#define planes_left static_cast<char>(_AL)
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register vram_byte_amount_t stride;
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_asm { push ds };
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_AX = cdg_dst_segment(_AX, top, _BX);
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_ES = _AX;
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_AX += (SEG_PLANE_E - SEG_PLANE_B); // AX == SEG_PLANE_E
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asm { push ax; }
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_AX -= SEG_PLANE_DIST_E; // AX == SEG_PLANE_E
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asm { push ax; }
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_AX -= SEG_PLANE_DIST_BRG; // AX == SEG_PLANE_R
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asm { push ax; }
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cdg = cdg_slot_offset(slot);
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dst_offset = cdg_dst_offset(dst_offset, cdg, left);
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tmp = cdg->vram_dword_w;
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cdg_dword_w = tmp;
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// One additional full line, since we move from the end of one CDG line to
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// the beginning of the previous one.
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stride = ((tmp * 4) + ROW_SIZE);
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reinterpret_cast<dots8_t __seg *>(tmp) = cdg->seg_colors();
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_DS = tmp;
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_SI = 0;
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planes_left = PLANE_COUNT;
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_asm { cld; }
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_asm { nop; }
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do {
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cdg_put_plane_raw(_ES, dst_offset, _DS, _SI, cdg_dword_w);
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// SI is now at the beginning of the next plane
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--planes_left;
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if(FLAGS_ZERO) {
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break;
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}
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_asm { pop es; }
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} while(1);
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_asm { pop ds };
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#undef planes_left
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#undef dst_offset
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#undef cdg_dword_w
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#undef tmp
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#undef cdg
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}
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#pragma codestring "\x90"
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