voxel-test/control.c

#include "cubes.h"
#include "gen.h"
#include "inv.h"
#include "linmath.h"
#include <GLFW/glfw3.h>

int is_space;
int ticks = 0;

int collision(struct chunk chunk, vec3 pos, vec3 dir_temp, int col, int n) {
  vec3 closestVert = {floor(pos[0]), floor(pos[1] + 0.5), floor(pos[2])};
  if (col) {
    double xd = dir_temp[0] / (closestVert[0] - (pos[0] - 0.5));
    double yd = dir_temp[1] / (closestVert[1] - (pos[1]));
    double zd = dir_temp[2] / (closestVert[2] - (pos[2] - 0.5));
    if (xd < 0 && n == 0) {
      pos[0] = (closestVert[0] + 0.5);
      dir_temp[0] = 0;
      return 1;
    }
    if (yd < 0 && n == 1) {
      dir_temp[1] = 0.015 / 2;
      pos[1] = closestVert[1];
      return 1;
    }
    if (zd < 0 && n == 2) {
      pos[2] = (closestVert[2] + 0.5);
      dir_temp[2] = 0;
      return 1;
    }
  }

  return 0;
}

struct v3f control_handler(double cx, double cy, vec3 pos, vec3 dir_temp,
                           GLFWwindow *window, struct chunk chunk) {

  double delta = glfwGetTime();
  if (delta > 1 / 60.0)
    delta = 1 / 60.0;
  glfwSetTime(0);
  delta *= 30;
  vec3 direction = {cosf(cy) * sinf(cx), sinf(cy), cosf(cy) * cosf(cx)};
  vec3 right = {sinf(cx - 3.14f / 2.0f) * 0.015 * delta, 0,
                cosf(cx - 3.14f / 2.0f) * 0.015 * delta};

  vec3 front = {sinf(cx) * 0.015 * delta, 0, cosf(cx) * 0.015 * delta};
  vec3 pos_temp = {0, 0, 0};

  vec3_dup(pos_temp, pos);

  vec3_scale(dir_temp, dir_temp, pow(0.9, delta));

  vec3 off = {0, 0, 0};
  int col = 0;
  for (int a = -2; a < 1; a++) {
    off[1] = a;
    for (int b = -1; b < 1; b++) {
      off[0] = (b + 0.5) * 0.8;
      for (int c = -1; c < 1; c++) {
        off[2] = (c + 0.5) * 0.8;
        col = col || gen_cube(pos[0] + off[0], pos[1] + off[1], pos[2] + off[2],
                              chunk, 0, -1);
      }
    }
  }

  vec3_add(pos, pos, dir_temp);

  dir_temp[1] -= 0.03 * delta;
  int is_col = 0;
  if (collision(chunk, pos, dir_temp, col, 1)) {
    is_col = 1;
    col = 0;

    off[1] = -2;
    for (int b = -1; b < 1; b++) {
      off[0] = (b + 0.5) * 0.95;
      for (int c = -1; c < 1; c++) {
        off[2] = (c + 0.5) * 0.95;
        col = col || gen_cube(pos[0] + off[0], pos[1] + off[1], pos[2] + off[2],
                              chunk, 0, -1);
      }
    }

    if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS && !col) {
      dir_temp[1] = 0.5 * delta;
    }
  }

  collision(chunk, pos, dir_temp, col, 0);
  collision(chunk, pos, dir_temp, col, 2);
  if (col) {
    ticks = 4;
  }
  ticks--;
  if (ticks < 0) {
    ticks = 0;
    if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
      vec3_sub(dir_temp, dir_temp, front);
    }

    if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
      vec3_add(dir_temp, dir_temp, front);
    }

    if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS) {
      vec3_add(dir_temp, dir_temp, right);
    }

    if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS) {
      vec3_sub(dir_temp, dir_temp, right);
    }
  }

  struct v3f dirOut;
  vec3_dup(dirOut.pos, direction);

  if (is_col && fabs(dir_temp[1]) < 0.1) {
    pos[1] -= dir_temp[1];
  }

  return dirOut;
}

struct v3f control_rtrace(double cx, double cy, vec3 pos, int mode) {
  struct chunk placeChunk;
  vec3 direction = {cosf(cy) * sinf(cx) * 0.1, sinf(cy) * 0.1,
                    cosf(cy) * cosf(cx) * 0.1};

  vec3 temp_pos;
  vec3 temp_dir;
  vec3_dup(temp_pos, pos);

  for (int i = 0; i < CHUNK_LENGTH * 4; i++) {

    double xd =
        fabs(direction[0]) / (((direction[0] > 0) ? (1.0 - fmod(temp_pos[0], 1))
                                                  : fmod(temp_pos[0], 1)) +
                              0.01);
    double yd =
        fabs(direction[1]) / (((direction[1] > 0) ? (1.0 - fmod(temp_pos[1], 1))
                                                  : fmod(temp_pos[1], 1)) +
                              0.01);
    double zd =
        fabs(direction[2]) / (((direction[2] > 0) ? (1.0 - fmod(temp_pos[2], 1))
                                                  : fmod(temp_pos[2], 1)) +
                              0.01);

    if (xd > yd && xd > zd && !isnan(xd)) {
      vec3_scale(temp_dir, direction, fabs(1 / xd + 0.01));
    } else if (yd > zd && !isnan(yd)) {
      vec3_scale(temp_dir, direction, fabs(1 / yd + 0.01));
    } else if (!isnan(zd)) {
      vec3_scale(temp_dir, direction, fabs(1 / zd + 0.01));
    }

    vec3_add(temp_pos, temp_pos, temp_dir);

    if (gen_cube(temp_pos[0], temp_pos[1], temp_pos[2], placeChunk, 0, -1) !=
        0) {
      if (mode == 0)
        vec3_sub(temp_pos, temp_pos, temp_dir);
      break;
    }
  }

  struct v3f out_pos;
  vec3_dup(out_pos.pos, temp_pos);

  return out_pos;
}

void control_lclick(double cx, double cy, vec3 pos, struct item *inv) {
  struct v3f highlighted = control_rtrace(cx, cy, pos, 1);
  struct chunk placeChunk;
  int cube = gen_cube(highlighted.pos[0], highlighted.pos[1],
                      highlighted.pos[2], placeChunk, 0, -1);
  if (cube == 0 ||
      (highlighted.pos[0] == (int)pos[0] && highlighted.pos[1] == (int)pos[1] &&
       highlighted.pos[2] == (int)pos[2]))
    return;
  gen_cube(highlighted.pos[0], highlighted.pos[1], highlighted.pos[2],
           placeChunk, 0, 0);

  for (int i = 0; i < 10; i++) {
    if (inv[i].id == 0) {
      inv[i].id = cube;
      inv[i].count = 0;
    }
    if (inv[i].id == cube && inv[i].count < 64) {
      inv[i].count++;
      break;
    }
  }
}

void control_rclick(double cx, double cy, vec3 pos, struct item *inv,
                    int slot) {
  struct v3f highlighted = control_rtrace(cx, cy, pos, 0);
  struct chunk placeChunk;
  int cube = gen_cube(highlighted.pos[0], highlighted.pos[1],
                      highlighted.pos[2], placeChunk, 0, -1);
  if (cube != 0 || (fabs(highlighted.pos[0] - pos[0]) < 1 &&
                    fabs(highlighted.pos[1] - pos[1] + 0.5) < 1.5 &&
                    fabs(highlighted.pos[2] - pos[2]) < 1))
    return;
  gen_cube(highlighted.pos[0], highlighted.pos[1], highlighted.pos[2],
           placeChunk, 0, inv[slot].id);

  for (int i = 0; i < 10; i++) {
    if (inv[i].id == inv[slot].id) {
      inv[i].count--;
      if (inv[i].count < 1) {
        inv[i].id = 0;
        inv[i].count = 0;
      }
      break;
    }
  }
}