binding-of-isaac/src/proj.c

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <math.h>
#include <stdbool.h>
#include <ncurses.h>
#include <unistd.h>
#include <termios.h>
#include <limits.h>
#include <time.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>

#include "structure.h"
#include "hash.h"
#include "base.h"
#include "move.h"
#include "entities.h"
#include "proj.h"

projectile** bullets ;
int bullets_id ;

double psize = 1.5;

pt_2d build_pt(double x, double y, double z) {
    pt_2d res;
    res.x = x ;
    res.y = y ;
    res.z = z ;
    return res;
}

void init_proj() {
    bullets = malloc(sizeof(projectile*)*MAX_SIZE);
    for(int k = 0; k < MAX_SIZE; k++) {
        bullets[k] = malloc(sizeof(projectile));
        bullets[k]->pos = build_pt(0.0, 0.0, 0.0);
        bullets[k]->vel = build_pt(0.0, 0.0, 0.0);
        bullets[k]->acc = build_pt(0.0, 0.0, 0.0);
        bullets[k]->size = 1.0;
        bullets[k]->ttl = 1.0;
        bullets[k]->red = 0;
        bullets[k]->green = 0;
        bullets[k]->blue = 0;
        bullets[k]->damage = 0;
    }
    bullets_id = 0;
}

bool is_proj_colliding_with_map(double x, double y, double z, double size) {
    for(int k = 0; k < current_room->map_size; k++) {
        if(distance_pt_cube_0_3d(x+size/2, y+size/2, z+size/2, current_room->map[k]) <= size/2) {
            return true ;
        }
    }
    return false ;
}

bool is_proj_colliding_with_tp(double x, double y, double z, double size) {
    for(int k = 0; k < current_room->tps_size; k++) {
        for(int d = 0; d < 8; d++) {
            if(distance_pt_cube_0_3d(x+size/2, y+size/2, z+size/2, current_room->tps[k].hitbox) <= size/2) {
                return true ;
            }
        }
    }
    return false ;
}

bool is_proj_colliding_w_player(double x, double y, double z, double size) {
    return (distance_pt_pt_3d(x, y, z, camx, camy, camz) <= size);
}

double ppx, ppy, ppz;
double projx, projy;
void addProjectileToDraw(projectile* proj) {
    if(triangles_i < MAX_SIZE-1) {
        project_to_camera(proj->pos.x, proj->pos.y, proj->pos.z, &ppx, &ppy, &ppz);
        if(ppz >= draw_constant) {
            projx = 1500.0 * (1.0 + (ppx / (1.5 * ppz * tan_fov))) / 2.0;
            projy = 1000.0 * (1.0 + (ppy / (ppz * tan_fov))) / 2.0;
            double rpsize = (40.0*psize/maxd(0.07, ppz));
            //printf("%lf\n", rpsize);
            triangles_to_render[triangles_i][0] = build_pt(projx-rpsize/2, projy-rpsize/2, 0.0);
            triangles_to_render[triangles_i][1] = build_pt(projx-rpsize/2, projy+rpsize/2, 0.0);
            triangles_to_render[triangles_i][2] = build_pt(projx+rpsize/2, projy+rpsize/2, 0.0);
            triangles_og_coords[triangles_i][0] = build_pt(ppx, ppy, ppz);
            triangles_og_coords[triangles_i][1] = build_pt(ppx, ppy, ppz);
            triangles_og_coords[triangles_i][2] = build_pt(ppx, ppy, ppz);
            reds[triangles_i] = proj->red;
            greens[triangles_i] = proj->green;
            blues[triangles_i] = proj->blue;
            triangles_i += 1;

            triangles_to_render[triangles_i][0] = build_pt(projx-rpsize/2, projy-rpsize/2, 0.0);
            triangles_to_render[triangles_i][1] = build_pt(projx+rpsize/2, projy-rpsize/2, 0.0);
            triangles_to_render[triangles_i][2] = build_pt(projx+rpsize/2, projy+rpsize/2, 0.0);
            triangles_og_coords[triangles_i][0] = build_pt(ppx, ppy, ppz);
            triangles_og_coords[triangles_i][1] = build_pt(ppx, ppy, ppz);
            triangles_og_coords[triangles_i][2] = build_pt(ppx, ppy, ppz);
            reds[triangles_i] = proj->red;
            greens[triangles_i] = proj->green;
            blues[triangles_i] = proj->blue;
            triangles_i += 1;
        }
    }
}

void drawProj() {
    for(int k = 0; k < bullets_id; k++) {
        addProjectileToDraw(bullets[k]);
    }
}

void appendProj(double x, double y, double z, double vx, double vy, double vz, double ax, double ay, double az, int r, int g, int b, int dmg, double ttl) {
    if(bullets_id < MAX_SIZE) {
        bullets[bullets_id]->red = r ;
        bullets[bullets_id]->green = g ;
        bullets[bullets_id]->blue = b ;
        bullets[bullets_id]->size = 1.0 ;
        bullets[bullets_id]->damage = dmg ;
        bullets[bullets_id]->ttl = ttl ;
        bullets[bullets_id]->pos = build_pt(x, y, z) ;
        bullets[bullets_id]->vel = build_pt(vx, vy, vz) ;
        bullets[bullets_id]->acc = build_pt(ax, ay, az) ;
        bullets_id += 1;
    }
}

void removeProj(int k) {
    bullets[k]->red = bullets[bullets_id]->red;
    bullets[k]->green = bullets[bullets_id]->green;
    bullets[k]->blue = bullets[bullets_id]->blue;
    bullets[k]->size = bullets[bullets_id]->size;
    bullets[k]->pos = bullets[bullets_id]->pos;
    bullets[k]->vel = bullets[bullets_id]->vel;
    bullets[k]->acc = bullets[bullets_id]->acc;
    bullets[k]->ttl = bullets[bullets_id]->ttl;
    bullets[k]->damage = bullets[bullets_id]->damage;
    bullets_id -= 1;
}

void updateAllProj(float dtime) {
    for(int k = 0; k < bullets_id; k++) {
        bullets[k]->vel.x += ((double)dtime)*(bullets[k]->acc.x);
        bullets[k]->vel.y += ((double)dtime)*(bullets[k]->acc.y);
        bullets[k]->vel.z += ((double)dtime)*(bullets[k]->acc.z);
        bullets[k]->pos.x += ((double)dtime)*(bullets[k]->vel.x);
        bullets[k]->pos.y += ((double)dtime)*(bullets[k]->vel.y);
        bullets[k]->pos.z += ((double)dtime)*(bullets[k]->vel.z);
        bullets[k]->ttl -= 20.0*(double)dtime;
        //if(k==0) printf("[%d] %lf\n", k, bullets[k]->ttl);
        if(is_proj_colliding_w_player(bullets[k]->pos.x - bullets[k]->size/2.0, bullets[k]->pos.y - bullets[k]->size/2.0, bullets[k]->pos.z - bullets[k]->size/2.0, bullets[k]->size)) {
            if(bullets[k]->damage != 0) {
                player_hp -= bullets[k]->damage ;
                fade_dmg = 255 ;
            }
            removeProj(k);
            k -= 1;
        } else if(bullets[k]->ttl <= 0.0 || (
            is_proj_colliding_with_map(bullets[k]->pos.x - bullets[k]->size/2.0, bullets[k]->pos.y - bullets[k]->size/2.0, bullets[k]->pos.z - bullets[k]->size/2.0, bullets[k]->size) ||
            is_proj_colliding_with_tp(bullets[k]->pos.x - bullets[k]->size/2.0, bullets[k]->pos.y - bullets[k]->size/2.0, bullets[k]->pos.z - bullets[k]->size/2.0, bullets[k]->size)
        )) {
            removeProj(k);
            k -= 1;
        }
    }
}

void resetProj() {
    bullets_id = 0;
}

void free_proj() {
    for(int k = 0; k < MAX_SIZE; k++) {
        free(bullets[k]);
    }
    free(bullets);
}