57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
function S32 os_main();
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const SizeU page_size = 4096;
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LRESULT CALLBACK
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WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam){
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return DefWindowProcW(hwnd, uMsg, wParam, lParam);;
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}
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int
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WinMain(HINSTANCE hInstance, HINSTANCE a, LPSTR b, int nShowCmd){
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wchar_t *CLASS_NAME = L"Cool window class";
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wchar_t *WINDOW_NAME = L"Have a good day!";
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WNDCLASSW wc = { };
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wc.lpfnWndProc = WindowProc;
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wc.hInstance = hInstance;
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wc.lpszClassName = CLASS_NAME;
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RegisterClassW(&wc);
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HWND window_handle = CreateWindowExW(0, CLASS_NAME, WINDOW_NAME, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, 0, 0, hInstance, 0);
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ShowWindow(window_handle, nShowCmd);
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return os_main();
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}
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function String
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os_read_file(String name){
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String result = {};
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FILE *f = fopen((char *)name.str, "rb");
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fseek(f, 0, SEEK_END);
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result.len = ftell(f);
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fseek(f, 0, SEEK_SET); /* same as rewind(f); */
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result.str = malloc(result.len + 1);
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fread(result.str, result.len, 1, f);
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fclose(f);
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result.str[result.len] = 0;
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return result;
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}
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function OS_Memory
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os_reserve(SizeU size){
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OS_Memory result = {0};
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SizeU adjusted_size = align_up(size, page_size);
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result.data = VirtualAlloc(0, adjusted_size, MEM_RESERVE, PAGE_READWRITE);
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assert_msg(result.data, "Failed to reserve virtual memory");
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result.reserve = adjusted_size;
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return result;
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}
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function void
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os_commit(OS_Memory *m, SizeU size){
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SizeU commit = align_up(size, page_size);
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void *p = VirtualAlloc((U8 *)m->data + m->commit, commit, MEM_COMMIT, PAGE_READWRITE);
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assert_msg(p, "Failed to commit more memory");
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m->commit += commit;
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} |