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LEFTONE/core/lobullet/linear.c

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#include "./linear.h"
#include <stdbool.h>
#include "util/coly2d/shape.h"
#include "util/math/algorithm.h"
#include "util/math/vector.h"
#include "core/locommon/position.h"
#include "core/loshader/bullet.h"
#include "./base.h"
#define FADE_DURATION_ 200
static bool lobullet_linear_update_(lobullet_base_t* base) {
assert(base != NULL);
const uint64_t t = base->ticker->time - base->param.since;
const float tf = t/1000.f;
if (t >= base->param.duration) {
return false;
}
const uint64_t rt = base->param.duration - t;
const float alpha = rt < FADE_DURATION_? rt*1.f/FADE_DURATION_: 1;
/* ---- movement ---- */
vec2_t v1;
vec2_mul(&v1, &base->param.velocity, tf);
vec2_t v2;
vec2_mul(&v2, &base->param.acceleration, tf*tf/2);
base->super.super.pos = base->param.basepos;
vec2_addeq(&base->super.super.pos.fract, &v1);
vec2_addeq(&base->super.super.pos.fract, &v2);
locommon_position_reduce(&base->super.super.pos);
/* ---- velocity ---- */
vec2_mul(&base->super.velocity, &base->param.acceleration, tf);
vec2_addeq(&base->super.velocity, &base->param.velocity);
/* ---- parameters ---- */
const float angle = base->param.angle + base->param.angular_velocity*tf;
base->cache = (typeof(base->cache)) {
.toxic = true,
.knockback = base->param.knockback,
.instance = {
.size = base->param.size,
.theta = angle,
.color = base->param.color,
.time = alpha,
},
};
base->super.shape = (coly2d_shape_t) {
.size = base->param.size,
.angle = angle,
};
return true;
}
bool lobullet_linear_circle_update(lobullet_base_t* base) {
assert(base != NULL);
if (!lobullet_linear_update_(base)) return false;
base->cache.instance.bullet_id = LOSHADER_BULLET_ID_LIGHT;
base->super.shape.type = COLY2D_SHAPE_TYPE_ELLIPSE;
return true;
}
bool lobullet_linear_triangle_update(lobullet_base_t* base) {
assert(base != NULL);
if (!lobullet_linear_update_(base)) return false;
base->cache.instance.bullet_id = LOSHADER_BULLET_ID_TRIANGLE;
base->super.shape.type = COLY2D_SHAPE_TYPE_TRIANGLE;
return true;
}
bool lobullet_linear_square_update(lobullet_base_t* base) {
assert(base != NULL);
if (!lobullet_linear_update_(base)) return false;
base->cache.instance.bullet_id = LOSHADER_BULLET_ID_SQUARE;
base->super.shape.type = COLY2D_SHAPE_TYPE_RECT;
return true;
}
void lobullet_linear_build_(
lobullet_base_t* base,
const lobullet_base_param_t* param) {
assert(base != NULL);
assert(param != NULL);
base->super.super.pos = param->basepos;
base->param = *param;
base->param.since = base->ticker->time;
}