mirror of https://github.com/nmlgc/ReC98.git
58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
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/// Stage 4 Boss - Marisa
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/// ---------------------
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#include "platform.h"
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#include "pc98.h"
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#include "th01/math/subpixel.hpp"
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#include "th04/math/motion.hpp"
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#include "th04/main/playfld.hpp"
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#include "th04/main/phase.hpp"
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#include "th04/main/boss/boss.hpp"
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/// State
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/// -----
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#define flystep_pointreflected_frame boss_statebyte[13]
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/// -----
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// On [flystep_pointreflected_frame] 0, this function sets up [boss] movement
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// towards the point reflection of Marisa's position across a fixed position
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// near the top of the sealed moon in the background. The velocity is
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// calculated to reach this exact point at [duration - 12], with Marisa braking
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// on the last 12 frames by halving that velocity each frame. Every call to
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// this function, including the one on frame 0, then applies this velocity to
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// [boss].
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// [duration] values <12 will move Marisa into the opposite direction instead.
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// Returns `true` if the function was called for [duration] frames.
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//
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// ZUN bug: Not defined for [duration] values of 12 or 13, which will crash the
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// game with a division by zero ("Divide Error"). The two patterns that pass a
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// variable [duration] to this function also only happen to call this function
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// every 4 frames rather than every frame, introducing additional jerkiness.
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bool pascal near marisa_flystep_pointreflected(int duration)
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{
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enum {
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POINT_X = TO_SP(PLAYFIELD_W / 2),
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POINT_Y = TO_SP((PLAYFIELD_H * 7) / 23),
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BRAKE_DURATION = 12,
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};
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if(flystep_pointreflected_frame == 0) {
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boss.pos.velocity.x.v = (
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(POINT_X - boss.pos.cur.x) / ((duration / 2) - (BRAKE_DURATION / 2))
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);
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boss.pos.velocity.y.v = (
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(POINT_Y - boss.pos.cur.y) / ((duration / 2) - (BRAKE_DURATION / 2))
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);
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}
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flystep_pointreflected_frame++;
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if(flystep_pointreflected_frame >= (duration - BRAKE_DURATION)) {
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boss.pos.velocity.x.v /= 2;
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boss.pos.velocity.y.v /= 2;
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}
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if(flystep_pointreflected_frame >= duration) {
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return true;
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}
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boss.pos.update_seg3();
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return false;
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}
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