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#include <GLFW/glfw3.h>
#include <math.h>
#include "voxel.h"
#include "window.h"
void camera_init(Camera *camera)
{
camera->fov = 70;
camera->near = 0.1;
camera->far = 1000;
camera->look_speed = 100;
camera->move_speed = 4.317 * 10;
glm_vec3_zero(camera->position);
glm_vec3_zero(camera->rotation);
camera->frustum = camera_frustum(camera);
}
void camera_proj(Camera *camera, mat4 proj)
{
float aspect, tan_half_foxy;
aspect = (float)window.width / (float)window.height;
tan_half_foxy = tanf(camera->fov * (M_PI / 180)) / 2.0;
glm_mat4_zero(proj);
proj[0][0] = 1.0 / (aspect * tan_half_foxy);
proj[1][1] = 1.0 / tan_half_foxy;
proj[2][2] = camera->far / (camera->far - camera->near);
proj[2][3] = 1;
proj[3][2] = -(camera->far * camera->near) / (camera->far - camera->near);
}
void camera_view(Camera *camera, mat4 view)
{
float c3, s3, c2, s2, c1, s1;
vec3 u, v, w;
c3 = cosf(camera->rotation[2] * (M_PI / 180));
s3 = sinf(camera->rotation[2] * (M_PI / 180));
c2 = cosf(camera->rotation[0] * (M_PI / 180));
s2 = sin(camera->rotation[0] * (M_PI / 180));
c1 = cosf(camera->rotation[1] * (M_PI / 180));
s1 = sinf(camera->rotation[1] * (M_PI / 180));
u[0] = c1 * c3 + s1 * s2 * s3;
u[1] = c2 * s3;
u[2] = c1 * s2 * s3 - c3 * s1;
v[0] = c3 * s1 * s2 - c1 * s3;
v[1] = c2 * c3;
v[2] = c1 * c3 * s2 + s1 * s3;
w[0] = c2 * s1;
w[1] = -s2;
w[2] = c1 * c2;
view[0][0] = u[0];
view[0][1] = v[0];
view[0][2] = w[0];
view[0][3] = 0;
view[1][0] = u[1];
view[1][1] = v[1];
view[1][2] = w[1];
view[1][3] = 0;
view[2][0] = u[2];
view[2][1] = v[2];
view[2][2] = w[2];
view[2][3] = 0;
view[3][0] = -glm_dot(u, camera->position);
view[3][1] = -glm_dot(v, camera->position);
view[3][2] = -glm_dot(w, camera->position);
view[3][3] = 1;
}
void camera_proj_view(Camera *camera, mat4 proj_view)
{
mat4 proj, view;
camera_proj(camera, proj);
camera_view(camera, view);
glm_mat4_mul(proj, view, proj_view);
}
static void camera_update_rotation(Camera *camera)
{
vec3 rotate;
glm_vec3_zero(rotate);
if (key_down(GLFW_KEY_RIGHT))
rotate[1] += 1;
if (key_down(GLFW_KEY_LEFT))
rotate[1] -= 1;
if (key_down(GLFW_KEY_UP))
rotate[0] -= 1;
if (key_down(GLFW_KEY_DOWN))
rotate[0] += 1;
glm_normalize(rotate);
camera->rotation[0] += camera->look_speed * delta_time * rotate[0];
camera->rotation[1] += camera->look_speed * delta_time * rotate[1];
camera->rotation[0] = glm_clamp(camera->rotation[0], -90, 90);
//camera->rotation[1] = camera->rotation[0] % 360.0;
}
static void camera_update_movement(Camera *camera)
{
vec3 forward, left, up, move;
float yaw;
yaw = camera->rotation[1] * (M_PI / 180);
glm_vec3_zero(forward);
forward[0] = sinf(yaw);
forward[2] = cosf(yaw);
glm_vec3_zero(left);
left[0] = -forward[2];
left[2] = forward[0];
glm_vec3_zero(up);
up[1] = 1;
glm_vec3_zero(move);
if (key_down(GLFW_KEY_W))
glm_vec3_add(move, forward, move);
if (key_down(GLFW_KEY_S))
glm_vec3_sub(move, forward, move);
if (key_down(GLFW_KEY_A))
glm_vec3_add(move, left, move);
if (key_down(GLFW_KEY_D))
glm_vec3_sub(move, left, move);
if (key_down(GLFW_KEY_E))
glm_vec3_add(move, up, move);
if (key_down(GLFW_KEY_Q))
glm_vec3_sub(move, up, move);
glm_normalize(move);
glm_vec3_scale(move, camera->move_speed * delta_time, move);
glm_vec3_add(camera->position, move, camera->position);
}
void camera_update(Camera *camera)
{
camera_update_rotation(camera);
camera_update_movement(camera);
camera->frustum = camera_frustum(camera);
}
Frustum camera_frustum(Camera *camera)
{
Frustum frustum;
mat4 proj_view;
camera_proj_view(camera, proj_view);
glm_mat4_transpose(proj_view);
// left
glm_vec4_add(proj_view[3], proj_view[0], frustum.left);
// right
glm_vec4_sub(proj_view[3], proj_view[0], frustum.right);
// bottom
glm_vec4_add(proj_view[3], proj_view[1], frustum.bottom);
// top
glm_vec4_sub(proj_view[3], proj_view[1], frustum.top);
// near
glm_vec4_add(proj_view[3], proj_view[2], frustum.near);
// far
glm_vec4_sub(proj_view[3], proj_view[2], frustum.far);
return frustum;
}
bool aabb_in_plane(AABB *aabb, Plane plane)
{
vec3 p;
float f;
p[0] = plane[0] >= 0 ? aabb->max[0] : aabb->min[0];
p[1] = plane[1] >= 0 ? aabb->max[1] : aabb->min[1];
p[2] = plane[2] >= 0 ? aabb->max[2] : aabb->min[2];
f = glm_vec3_dot(p, plane) + plane[3];
return f >= 0.0f;
}
bool aabb_in_frustum(AABB *aabb, Frustum *frustum)
{
return aabb_in_plane(aabb, frustum->near) && aabb_in_plane(aabb, frustum->far) &&
aabb_in_plane(aabb, frustum->left) && aabb_in_plane(aabb, frustum->right) &&
aabb_in_plane(aabb, frustum->top) && aabb_in_plane(aabb, frustum->bottom);
}
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