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#include "GL/glew.h"
#include "SDL3/SDL.h"
#include "prge.h"
#include "game.h"
#include "game.c"
void process_mouse_pos(Input *input, SDL_MouseMotionEvent *mouseev)
{
V2 offset;
input->mouse_pos = v2((F32)mouseev->x, (F32)mouseev->y);
if (input->first_mouse)
input->first_mouse = 0;
offset = v2((F32)mouseev->xrel, (F32)mouseev->yrel);
input->mouse_offset = v2add(input->mouse_offset, offset);
}
void process_key(B32 down, Key *key)
{
key->state = (down ? KeyState_PRESS : KeyState_RELEASE);
}
void process_keyboard(Input *input, SDL_KeyboardEvent *keyev)
{
switch (keyev->scancode) {
case SDL_SCANCODE_D:
process_key(keyev->down, &input->move_right);
break;
case SDL_SCANCODE_W:
process_key(keyev->down, &input->move_forward);
break;
case SDL_SCANCODE_A:
process_key(keyev->down, &input->move_left);
break;
case SDL_SCANCODE_S:
process_key(keyev->down, &input->move_backward);
break;
case SDL_SCANCODE_E:
process_key(keyev->down, &input->move_up);
break;
case SDL_SCANCODE_Q:
process_key(keyev->down, &input->move_down);
break;
case SDL_SCANCODE_SPACE:
process_key(keyev->down, &input->jump);
break;
case SDL_SCANCODE_RIGHT:
process_key(keyev->down, &input->action_right);
break;
case SDL_SCANCODE_UP:
process_key(keyev->down, &input->action_up);
break;
case SDL_SCANCODE_LEFT:
process_key(keyev->down, &input->action_left);
break;
case SDL_SCANCODE_DOWN:
process_key(keyev->down, &input->action_down);
break;
case SDL_SCANCODE_ESCAPE:
process_key(keyev->down, &input->exit);
break;
default:
break;
}
}
void process_mouse_buttons(Input *input, SDL_MouseButtonEvent *buttonev)
{
if (buttonev->button == SDL_BUTTON_LEFT)
process_key(buttonev->down, &input->mouse_left);
else if (buttonev->button == SDL_BUTTON_RIGHT)
process_key(buttonev->down, &input->mouse_right);
}
void handle_events(Window *wnd, Input *input)
{
SDL_Event event;
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_EVENT_KEY_DOWN:
case SDL_EVENT_KEY_UP:
process_keyboard(input, &event.key);
break;
case SDL_EVENT_MOUSE_MOTION:
process_mouse_pos(input, &event.motion);
break;
case SDL_EVENT_MOUSE_BUTTON_DOWN:
case SDL_EVENT_MOUSE_BUTTON_UP:
process_mouse_buttons(input, &event.button);
break;
case SDL_EVENT_WINDOW_RESIZED:
wnd->width = event.window.data1;
wnd->height = event.window.data2;
break;
default:
break;
}
}
}
F32 get_elapsed_seconds(U64 cur, U64 last)
{
F32 res;
res = ((F32)cur-(F32)last)/1000.0f;
return res;
}
F32 lock_framerate(U64 last, F32 target)
{
F32 target_mspf, elapsed, sleep, dt;
elapsed = get_elapsed_seconds(SDL_GetTicks(), last)*1000.0f;
target_mspf = 1000.0f/target;
if (elapsed < target_mspf) {
sleep = target_mspf-elapsed;
if (sleep > 0.0f)
SDL_Delay(sleep);
/*
do {
elapsed = get_elapsed_seconds(SDL_GetTicks(), last)*1000.0f;
} while (elapsed < target_mspf);
*/
}
dt = get_elapsed_seconds(SDL_GetTicks(), last);
return dt;
}
B32 sdl_init(Window *wnd, SDL_Window **sdl_window, SDL_GLContext *context)
{
U32 flags;
GLenum error;
Arena *tmpar;
char *wname;
if (!SDL_Init(SDL_INIT_VIDEO)) {
SDL_Log("[ERROR] : SDL : %s\n", SDL_GetError());
return 0;
}
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
tmpar = arena_alloc(0);
wname = str8tocstr(tmpar, wnd->name);
flags = SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE;
(*sdl_window) = SDL_CreateWindow(wname, wnd->width, wnd->height, flags);
arena_release(tmpar);
if (!(*sdl_window)) {
SDL_Log("[ERROR] : SDL : %s\n", SDL_GetError());
return 0;
}
SDL_GetWindowSize(*sdl_window, &wnd->width, &wnd->height);
(*context) = SDL_GL_CreateContext((*sdl_window));
if (!(*context)) {
SDL_Log("[ERROR] : SDL : %s\n", SDL_GetError());
return 0;
}
error = glewInit();
if (error != GLEW_OK) {
SDL_Log("[ERROR] : GLEW : %s\n", glewGetErrorString(error));
return 0;
}
return 1;
}
int main(void)
{
/* NOTE(pryazha): Engine init */
Input input;
Window wnd;
input = input_init();
wnd = window_init(800, 600, str8lit("PRGE example"));
/* NOTE(pryazha): SDL and OpenGL init */
SDL_Window *sdl_window;
SDL_GLContext context;
U64 last;
if (!sdl_init(&wnd, &sdl_window, &context)) {
SDL_Quit();
return 1;
}
glEnable(GL_DEPTH_TEST);
/* NOTE(pryazha): Game init */
State state;
MemoryZero(&state, sizeof(State));
init(&state);
last = SDL_GetTicks();
while (input.is_running) {
SDL_SetWindowRelativeMouseMode(sdl_window, input.capture_mouse);
handle_events(&wnd, &input);
input.dt = lock_framerate(last, 60.0f);
last = SDL_GetTicks();
update_and_render(&wnd, &state, &input);
input_update(&input);
SDL_GL_SwapWindow(sdl_window);
}
clear(&state);
SDL_GL_DestroyContext(context);
SDL_DestroyWindow(sdl_window);
SDL_Quit();
return 0;
}
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