141 lines
4.2 KiB
C
141 lines
4.2 KiB
C
#include "vdp2.h"
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#include "vdp1.h"
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void start(void) {
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//
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// vdp2: enable and set Back Screen color
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//
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vdp2.reg.TVMD = ( TVMD__DISP | TVMD__BDCLMD | TVMD__LSMD__NON_INTERLACE
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| TVMD__VRESO__240 | TVMD__HRESO__NORMAL_320);
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vdp2.reg.BGON = 0;
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// BKTAU/BKTAL are shifted left 1: (0x4000 << 1 = 0x8000)
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vdp2.reg.BKTA = REG_UL(BKTAU__BKCLMD_SINGLE_COLOR, 0x4000);
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// background color, rgb15
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vdp2.vram.u16[0x8000 / 2] = (0x05 << 0); // dark red
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//
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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__N0BMSZ__512x512_DOT
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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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// 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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//
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// vdp1:
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//
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// The VBE setting must be set immediately after the V-blank IN interrupt.
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//
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// TVM settings must be performed from the second H-blank IN interrupt after
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// the V-blank IN interrupt to the H-blank IN interrupt immediately after the
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// V-blank OUT interrupt.
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vdp1.reg.TVMR = ( TVMR__TVM__NTSC_PAL
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| TVMR__TVM__FRAMEBUFFER_NONROTATION
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| TVMR__TVM__16BPP
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);
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// make FCM and FCT settings immediately after V-blank OUT
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vdp1.reg.FBCR = 0;
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// "A command table must always be stored at address 00000H to 0001EH."
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// we can't trigger a plot yet because we have no (valid) table.
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//vdp1.reg.PTMR = PTMR__PTM__FRAME_CHANGE;
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vdp1.reg.EWDR = 0; // black
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// upper-left
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vdp1.reg.EWLR = PTMR__EWLR__16BPP_X1(0) | PTMR__EWLR__Y1(0);
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// lower-right
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vdp1.reg.EWRR = PTMR__EWRR__16BPP_X3(319) | PTMR__EWRR__Y3(239);
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vdp1.vram.cmd[0].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__USER_CLIP_COORDINATES;
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vdp1.vram.cmd[0].LINK = 0;
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vdp1.vram.cmd[0].XA = 0;
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vdp1.vram.cmd[0].YA = 0;
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vdp1.vram.cmd[0].XC = 319;
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vdp1.vram.cmd[0].YC = 239;
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vdp1.vram.cmd[1].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__SYSTEM_CLIP_COORDINATES;
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vdp1.vram.cmd[1].LINK = 0;
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vdp1.vram.cmd[1].XC = 319;
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vdp1.vram.cmd[1].YC = 239;
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vdp1.vram.cmd[2].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__LOCAL_COORDINATE;
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vdp1.vram.cmd[2].LINK = 0;
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vdp1.vram.cmd[2].XA = 0;
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vdp1.vram.cmd[2].YA = 0;
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vdp1.vram.cmd[3].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__POLYGON;
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vdp1.vram.cmd[3].LINK = 0;
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vdp1.vram.cmd[3].PMOD = CTRL__PMOD__ECD | CTRL__PMOD__SPD;
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vdp1.vram.cmd[3].COLR = 0x2; // palette color #2
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vdp1.vram.cmd[3].XA = 50;
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vdp1.vram.cmd[3].YA = 50;
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vdp1.vram.cmd[3].XB = 150;
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vdp1.vram.cmd[3].YB = 50;
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vdp1.vram.cmd[3].XC = 150;
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vdp1.vram.cmd[3].YC = 150;
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vdp1.vram.cmd[3].XD = 50;
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vdp1.vram.cmd[3].YD = 150;
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vdp1.vram.cmd[4].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__POLYGON;
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vdp1.vram.cmd[4].LINK = 0;
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vdp1.vram.cmd[4].PMOD = CTRL__PMOD__ECD | CTRL__PMOD__SPD;
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vdp1.vram.cmd[4].COLR = (1 << 15) | (0x31 << 10) | (0x31 << 0); // RGB15 magenta
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vdp1.vram.cmd[4].XA = 100;
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vdp1.vram.cmd[4].YA = 50;
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vdp1.vram.cmd[4].XB = 150;
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vdp1.vram.cmd[4].YB = 100;
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vdp1.vram.cmd[4].XC = 100;
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vdp1.vram.cmd[4].YC = 150;
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vdp1.vram.cmd[4].XD = 50;
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vdp1.vram.cmd[4].YD = 100;
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vdp1.vram.cmd[5].CTRL = CTRL__END;
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// priorities
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vdp2.reg.PRISA = 0x0101;
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vdp2.reg.PRISB = 0x0101;
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vdp2.reg.PRISC = 0x0101;
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vdp2.reg.PRISD = 0x0101;
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// start drawing
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vdp1.reg.PTMR = PTMR__PTM__FRAME_CHANGE;
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while (1) {}
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}
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