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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
#include "base.h"
no_warn_start
#if _WIN32
#include <SDL.h>
#else
#include <SDL2/SDL.h>
#endif
no_warn_end
#include <GL/gl.h>
#include <locale.h>
#include "text.h"
#include "buffer.c"
static void die(char const *fmt, ...) {
char buf[256] = {0};
va_list args;
va_start(args, fmt);
vsnprintf(buf, sizeof buf - 1, fmt, args);
va_end(args);
// show a message box, and if that fails, print to stderr
if (SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error", buf, NULL) < 0) {
fprintf(stderr, "%s\n", buf);
}
exit(EXIT_FAILURE);
}
#if _WIN32
INT WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR lpCmdLine, INT nCmdShow) {
#else
int main(void) {
#endif
setlocale(LC_ALL, ""); // allow unicode
SDL_SetHint(SDL_HINT_NO_SIGNAL_HANDLERS, "1"); // if this program is sent a SIGTERM/SIGINT, don't turn it into a quit event
if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) < 0)
die("%s", SDL_GetError());
SDL_Window *window = SDL_CreateWindow("ted", SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED, 1280, 720, SDL_WINDOW_SHOWN|SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
if (!window)
die("%s", SDL_GetError());
{ // set icon
SDL_Surface *icon = SDL_LoadBMP("assets/icon.bmp");
SDL_SetWindowIcon(window, icon);
SDL_FreeSurface(icon);
}
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
SDL_GLContext *glctx = SDL_GL_CreateContext(window);
if (!glctx) {
die("%s", SDL_GetError());
}
SDL_GL_SetSwapInterval(1); // vsync
Font *font = text_font_load("assets/font.ttf", 16);
if (!font) {
die("Couldn't load font: %s", text_get_err());
}
bool quit = false;
TextBuffer text_buffer;
{
FILE *fp = fopen("main.c", "r");
assert(fp);
bool success = text_buffer_load_file(&text_buffer, fp);
fclose(fp);
if (!success)
die("Error loading file.");
}
Uint32 time_at_last_frame = SDL_GetTicks();
while (!quit) {
SDL_Event event;
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_QUIT:
quit = true;
break;
case SDL_MOUSEWHEEL: {
// scroll with mouse wheel
Sint32 dx = event.wheel.x, dy = -event.wheel.y;
double scroll_speed = 2.5;
text_buffer_scroll(&text_buffer, dx * scroll_speed, dy * scroll_speed);
} break;
}
}
Uint8 const *keyboard_state = SDL_GetKeyboardState(NULL);
bool control_key_down = keyboard_state[SDL_SCANCODE_LCTRL] || keyboard_state[SDL_SCANCODE_RCTRL];
double frame_dt;
{
Uint32 time_this_frame = SDL_GetTicks();
frame_dt = 0.001 * (time_this_frame - time_at_last_frame);
time_at_last_frame = time_this_frame;
}
if (control_key_down) {
// control + arrow keys to scroll
double scroll_speed = 20.0;
double scroll_amount = scroll_speed * frame_dt;
if (keyboard_state[SDL_SCANCODE_UP])
text_buffer_scroll(&text_buffer, 0, -scroll_amount);
if (keyboard_state[SDL_SCANCODE_DOWN])
text_buffer_scroll(&text_buffer, 0, +scroll_amount);
// @TODO: get this to work
#if 0
if (keyboard_state[SDL_SCANCODE_LEFT])
text_buffer_scroll(&text_buffer, -scroll_amount, 0);
if (keyboard_state[SDL_SCANCODE_RIGHT])
text_buffer_scroll(&text_buffer, +scroll_amount, 0);
#endif
}
int window_width = 0, window_height = 0;
SDL_GetWindowSize(window, &window_width, &window_height);
float window_widthf = (float)window_width, window_heightf = (float)window_height;
// set up GL
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glViewport(0, 0, window_width, window_height);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
// pixel coordinates; down is positive y
glOrtho(0, window_width, window_height, 0, -1, +1);
glClearColor(0, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
{
float x1 = 50, y1 = 50, x2 = window_widthf-50, y2 = window_heightf-50;
text_buffer_render(&text_buffer, font, x1, y1, x2, y2);
if (text_has_err()) {
printf("Text error: %s\n", text_get_err());
break;
}
}
//text_buffer_print_debug(&text_buffer);
SDL_GL_SwapWindow(window);
}
SDL_GL_DeleteContext(glctx);
SDL_DestroyWindow(window);
SDL_Quit();
text_buffer_free(&text_buffer);
text_font_free(font);
return 0;
}
|
