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further simplify polygon example

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This commit is contained in:
Zack Buhman 2023-01-28 14:58:40 -08:00
parent 60a7776b22
commit a5f5aed460
1 changed files with 25 additions and 25 deletions
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50
vdp1/polygon.cpp
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@ -30,45 +30,45 @@ void main()
constexpr uint16_t black = 0x0000; constexpr uint16_t black = 0x0000;
vdp1.reg.EWDR = black; vdp1.reg.EWDR = black;
// the EWLR/EWRR macros use somewhat nontrivial math for the X1 coordinates // the EWLR/EWRR macros use somewhat nontrivial math for the X coordinates
// erase upper-left coordinate // erase upper-left coordinate
vdp1.reg.EWLR = EWLR__16BPP_X1(0) | EWLR__Y1(0); vdp1.reg.EWLR = EWLR__16BPP_X1(0) | EWLR__Y1(0);
// erase lower-right coordinate // erase lower-right coordinate
vdp1.reg.EWRR = EWRR__16BPP_X3(319) | EWRR__Y3(239); vdp1.reg.EWRR = EWRR__16BPP_X3(319) | EWRR__Y3(239);
vdp1.vram.cmd[0].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__USER_CLIP_COORDINATES; vdp1.vram.cmd[0].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__SYSTEM_CLIP_COORDINATES;
vdp1.vram.cmd[0].LINK = 0; vdp1.vram.cmd[0].LINK = 0;
vdp1.vram.cmd[0].XA = 0;
vdp1.vram.cmd[0].YA = 0;
vdp1.vram.cmd[0].XC = 319; vdp1.vram.cmd[0].XC = 319;
vdp1.vram.cmd[0].YC = 239; vdp1.vram.cmd[0].YC = 239;
vdp1.vram.cmd[1].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__SYSTEM_CLIP_COORDINATES; vdp1.vram.cmd[1].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__LOCAL_COORDINATE;
vdp1.vram.cmd[1].LINK = 0; vdp1.vram.cmd[1].LINK = 0;
vdp1.vram.cmd[1].XC = 319; vdp1.vram.cmd[1].XA = 0;
vdp1.vram.cmd[1].YC = 239; vdp1.vram.cmd[1].YA = 0;
vdp1.vram.cmd[2].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__LOCAL_COORDINATE;
vdp1.vram.cmd[2].LINK = 0;
vdp1.vram.cmd[2].XA = 0;
vdp1.vram.cmd[2].YA = 0;
constexpr uint16_t magenta = (0x31 << 10) | (0x31 << 0); constexpr uint16_t magenta = (0x31 << 10) | (0x31 << 0);
vdp1.vram.cmd[3].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__POLYGON; vdp1.vram.cmd[2].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__POLYGON;
vdp1.vram.cmd[3].LINK = 0; vdp1.vram.cmd[2].LINK = 0;
vdp1.vram.cmd[3].PMOD = CTRL__PMOD__ECD | CTRL__PMOD__SPD; // "Set [ECD] to '1' for polygons, polylines, and lines"
vdp1.vram.cmd[3].COLR = (1 << 15) | magenta; // non-palettized (rgb15) color data // "Be sure to set [SPD] to '1' for polygons, polylines, and lines"
vdp1.vram.cmd[3].XA = 100; //
vdp1.vram.cmd[3].YA = 50; // The "user clip mode" bit is not set in PMOD here, so setting "user clip
vdp1.vram.cmd[3].XB = 150; // coordinates" has no effect on this draw command. However, "system clip
vdp1.vram.cmd[3].YB = 100; // coordinates" and "local coordinates" are always applied, and must be set to
vdp1.vram.cmd[3].XC = 100; // reasonable values.
vdp1.vram.cmd[3].YC = 150; vdp1.vram.cmd[2].PMOD = PMOD__ECD | PMOD__SPD;
vdp1.vram.cmd[3].XD = 50; vdp1.vram.cmd[2].COLR = COLR__RGB | magenta; // non-palettized (rgb15) color data
vdp1.vram.cmd[3].YD = 100; vdp1.vram.cmd[2].XA = 100;
vdp1.vram.cmd[2].YA = 50;
vdp1.vram.cmd[2].XB = 150;
vdp1.vram.cmd[2].YB = 100;
vdp1.vram.cmd[2].XC = 100;
vdp1.vram.cmd[2].YC = 150;
vdp1.vram.cmd[2].XD = 50;
vdp1.vram.cmd[2].YD = 100;
vdp1.vram.cmd[4].CTRL = CTRL__END; vdp1.vram.cmd[3].CTRL = CTRL__END;
// start drawing (execute the command list) on every frame // start drawing (execute the command list) on every frame
vdp1.reg.PTMR = PTMR__PTM__FRAME_CHANGE; vdp1.reg.PTMR = PTMR__PTM__FRAME_CHANGE;