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#include <windows.h>
#include <gl/GL.h>
#include <stdio.h>
#include "game.hpp"
struct wincontext_t {
HWND window;
HDC device_context;
i32 width;
i32 height;
};
static wincontext_t wincontext;
static input_t input;
LRESULT WndProc(HWND window, UINT message, WPARAM wparam, LPARAM lparam)
{
LRESULT result = 0;
switch (message) {
case WM_DESTROY:
case WM_QUIT:
wincontext.running = 0;
break;
case WM_KEYDOWN:
switch (wparam) {
case VK_ESCAPE:
input.escape.current = 1;
break;
default:
break;
}
break;
case WM_KEYUP:
switch (wparam) {
case VK_ESCAPE:
input.escape.current = 0;
break;
default:
break;
}
break;
case WM_SIZE:
wincontext.width = LOWORD(lparam);
wincontext.height = HIWORD(lparam);
glViewport(wincontext.width, wincontext.height);
break;
default:
result = DefWindowProc(window, message, wparam, lparam);
}
return result;
}
void update_input(input_t *input)
{
input->escape.last = input->escape.current;
}
i32 init_win(HINSTANCE instance, i32 show_cmd, i32 width, i32 height)
{
WNDCLASSA window_class = {};
window_class.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
window_class.lpfnWndProc = (WNDPROC)WndProc;
window_class.hInstance = instance;
window_class.hCursor = LoadCursor(0, IDC_ARROW);
window_class.lpszClassName = "window class";
if (!RegisterClass(&window_class)) {
printf("error: failed to register window class\n");
return 0;
}
wincontext.width = width;
wincontext.height = height;
wincontext.window = CreateWindow(window_class.lpszClassName, "game", WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, wincontext.width, wincontext.height, 0, 0, instance, 0);
if (!wincontext.window) {
printf("error: failed to create a window\n");
return 0;
}
wincontext.running = 1;
wincontext.device_context = GetDC(wincontext.window);
if (!wincontext.device_context) {
printf("error: failed to get device context\n");
return 0;
}
PIXELFORMATDESCRIPTOR pixel_format_desc = {};
pixel_format_desc.nSize = sizeof(PIXELFORMATDESCRIPTOR);
pixel_format_desc.nVersion = 1;
pixel_format_desc.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pixel_format_desc.cColorBits = 32;
pixel_format_desc.cAlphaBits = 8;
pixel_format_desc.cDepthBits = 24;
i32 pixel_format = ChoosePixelFormat(wincontext.device_context, &pixel_format_desc);
if (!pixel_format) {
printf("error: failed to choose pixel format\n");
return 0;
}
if (!SetPixelFormat(wincontext.device_context, pixel_format, &pixel_format_desc)) {
printf("error: failed to set pixel format\n");
return 0;
}
HGLRC gl_context = wglCreateContext(wincontext.device_context);
if (!gl_context) {
printf("error: failed to create gl context\n");
return 0;
}
if (!wglMakeCurrent(wincontext.device_context, gl_context)) {
printf("error: failed to make gl context current\n");
return 0;
}
ShowWindow(wincontext.window, show_cmd);
UpdateWindow(wincontext.window);
return 1;
}
void handle_win_events()
{
MSG messages;
while (PeekMessage(&messages, 0, 0, 0, PM_REMOVE)) {
TranslateMessage(&messages);
DispatchMessage(&messages);
}
}
int WinMain(HINSTANCE instance, HINSTANCE prev_instance, LPSTR cmdline, int show_cmd)
{
if (!init_win(instance, show_cmd, 1600, 900))
return 1;
if (!init_game()) {
}
while (wincontext.running) {
handle_win_events();
game_update_and_render(input);
update_input(&input);
SwapBuffers(wincontext.device_context);
}
return 0;
}
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