Zack Buhman
6640c37a1d
- add code loading for m68k
- incomplete scsp experiments
- the register definitions should be fairly complete,
though I did not produce actual sound yet
- fix type.h definitions
- incomplete cdblock register definitions
38 lines
1.3 KiB
C
38 lines
1.3 KiB
C
//
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// vdp2: define and place a single character on NBG0
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//
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vdp2.reg.BGON = BGON__N0ON;
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vdp2.reg.CHCTLA = ( CHCTLA__N0CHCN__16_COLOR // 4 bits per pixel, palettized
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| CHCTLA__N0BMEN__CELL_FORMAT
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| CHCTLA__N0CHSZ__1x1_CELL
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);
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vdp2.reg.PNCN0 = PNCN0__N0PNB__2WORD;
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vdp2.reg.PLSZ = PLSZ__N0PLSZ__1x1;
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vdp2.vram.u16[16 + 0] = (1 << 12); // top left pixel of character # 1
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vdp2.vram.u16[16 + 15] = (2 << 0 ); // bottom right pixel of character # 1
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vdp2.cram.u16[1] = (0x31 << 5); // green
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vdp2.cram.u16[2] = (0x31 << 10); // blue
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// given:
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// Plane Size: 1h X 1v
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// Pattern Name Data Size: 2 Words
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// only bits 5~0 are used for map address calculation
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// so MPOFN is effectively ignored
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vdp2.reg.MPOFN = MPOFN__N0MP(0); // bits 8~6
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vdp2.reg.MPABN0 = MPABN0__N0MPB(0) | MPABN0__N0MPA(1); // bits 5~0
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vdp2.reg.MPCDN0 = MPABN0__N0MPB(0) | MPABN0__N0MPA(1); // bits 5~0
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// zeroize NBG0 plane; this should be less than 0x8000 above
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s32 plane_size = 64 * 64 * 4; // is this correct ?
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fill_32(&vdp2.vram.u32[(0x4000 / 4)], 0, plane_size);
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// Table 4.8 Address value of map designated register by setting
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// (bit 5~0) * 0x4000
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vdp2.vram.u32[(0x4000 / 4)] = PATTERN_NAME_TABLE_2WORD__CHARACTER(1);
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