1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
#include "renderer.h"
#include "screen.h"
#include "ray.h"
#include <math.h>
#include <pthread.h>
#include <stdio.h>
#include <string.h>
void init_camera(Camera* camera) {
camera->pos.x = 3;
camera->pos.y = 3;
camera->angle = PI / 4;
}
static double fov = PI / 4;
#define MOVE_SPEED 1
#define ROTATE_SPEED PI / 2
#define FOV_CHANGE_SPEED 1
#define PLAYER_SIZE .1
void update_camera(Camera* camera, Screen* screen) {
double rotate = 0;
if (key_down(KEY_LEFT))
rotate -= ROTATE_SPEED;
if (key_down(KEY_RIGHT))
rotate += ROTATE_SPEED;
rotate *= screen->delta;
rotate += camera->angle;
while (rotate >= PI2) rotate -= PI2;
while (rotate < 0) rotate += PI2;
camera->angle = rotate;
v2 forward = { cos(camera->angle), sin(camera->angle) };
v2 left = { forward.y, -forward.x };
v2 move = { 0, 0 };
if (key_down(KEY_W)) {
move.x += forward.x;
move.y += forward.y;
}
if (key_down(KEY_S)) {
move.x -= forward.x;
move.y -= forward.y;
}
if (key_down(KEY_A)) {
move.x += left.x;
move.y += left.y;
}
if (key_down(KEY_D)) {
move.x -= left.x;
move.y -= left.y;
}
if (key_down(KEY_EQUALS)) {
fov += FOV_CHANGE_SPEED * screen->delta;
}
if (key_down(KEY_MINUS)) {
fov -= FOV_CHANGE_SPEED * screen->delta;
}
v2 hit_pos;
bool movex, movey;
cast_ray(camera->pos, sign(move.x) == 1 ? 0 : PI, &hit_pos);
movex = v2_dist(hit_pos, camera->pos) > PLAYER_SIZE;
cast_ray(camera->pos, sign(move.y) == 1 ? PIH : -PIH, &hit_pos);
movey = v2_dist(hit_pos, camera->pos) > PLAYER_SIZE;
if (movex) camera->pos.x += move.x * MOVE_SPEED * screen->delta;
if (movey) camera->pos.y += move.y * MOVE_SPEED * screen->delta;
}
static void verline(Swapchain* swapchain, int x, int y0, int y1, uint32_t color) {
for (int y = y0; y <= y1; y++) {
swapchain->images[swapchain->image_current][(y * swapchain->width) + x] = color;
}
}
void render(Screen* screen, const Camera* camera) {
const v2 cam_right = {
-sin(camera->angle),
cos(camera->angle)
};
Swapchain* swapchain = &screen->swapchain;
swapchain_next(swapchain);
for (int x = 0; x < screen->swapchain.width; x++) {
const float xcam = (2 * (x / (float) (swapchain->width))) - 1;
const float change = fov * atan(xcam);
const float theta = camera->angle + change;
v2 hit_pos;
uint32_t hit = cast_ray(camera->pos, theta, &hit_pos);
hit_pos.x -= camera->pos.x;
hit_pos.y -= camera->pos.y;
float len = v2_cross(hit_pos, cam_right) / v2_len(cam_right);
uint32_t color;
switch (hit) {
case 1: color = 0xFF0000FF; break;
case 2: color = 0xFF00FF00; break;
case 3: color = 0xFFFF0000; break;
case 4: color = 0xFFFF00FF; break;
case 5: color = 0xFFFFFF00; break;
default: color = 0xFF000000; break;
}
// switch (hit) {
// case 1: color = 0xFF0000FF; break;
// case 2: color = 0x00FF00FF; break;
// case 3: color = 0x0000FFFF; break;
// case 4: color = 0xFF00FFFF; break;
// case 5: color = 0x00FFFFFF; break;
// default: color = 0x000000FF; break;
// }
const int
h = (int) (swapchain->height / len),
y0 = max((swapchain->height / 2) - (h / 2), 0),
y1 = min((swapchain->height / 2) + (h / 2), swapchain->height - 1);
verline(swapchain, x, 0, y0, 0xFF202020);
verline(swapchain, x, y0, y1, color);
verline(swapchain, x, y1, swapchain->height - 1, 0xFF505050);
// verline(screen, x, 0, y0, 0x202020FF);
// verline(screen, x, y0, y1, color);
// verline(screen, x, y1, screen->height - 1, 0x505050FF);
}
swapchain_submit(swapchain);
}
|
