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#define UNICODE
#include <windows.h>
#include <assert.h>
#include <stdio.h>
#include <io.h>
#include <fcntl.h>
#define SPONGE_IMPLEMENTATION
#include "sponge.h"
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#include "example.h"
#define DEFAULT_WIDTH 256
#define DEFAULT_HEIGHT 256
#define TARGET_FRAME_TIME_US 16666
static size_t pixels_buffer_count;
static sponge_Texture canvas;
static BITMAPINFO bmi;
int update_canvas(sponge_Texture *canvas, uint32_t new_width, uint32_t new_height) {
size_t new_count = new_width * new_height;
if (new_count > pixels_buffer_count) {
uint32_t *new_pixels_buffer = malloc(new_count * sizeof(uint32_t));
if (!new_pixels_buffer)
return 0;
free(canvas->pixels);
canvas->pixels = new_pixels_buffer;
pixels_buffer_count = new_count;
}
canvas->width = new_width;
canvas->height = new_height;
canvas->stride = new_width; // TODO(kard): think about this if we want image to stay the same without redraw
ZeroMemory(&bmi, sizeof(bmi));
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biWidth = new_width;
bmi.bmiHeader.biHeight = -(int32_t)new_height; // negative = top-down
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
bmi.bmiHeader.biCompression = BI_RGB;
return 1;
}
// TODO(kard): MSVC complains about freopen (should be freopen_s apparently)
void redirect_io_to_console() {
AllocConsole();
FILE *fp;
fp = freopen("CONOUT$", "w", stdout);
setvbuf(stdout, NULL, _IONBF, 0);
fp = freopen("CONOUT$", "w", stderr);
setvbuf(stderr, NULL, _IONBF, 0);
fp = freopen("CONIN$", "r", stdin);
setvbuf(stdin, NULL, _IONBF, 0);
}
LRESULT WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
switch (uMsg) {
case WM_DESTROY: {
PostQuitMessage(0);
return 0;
}
case WM_SIZE: {
uint32_t width = LOWORD(lParam);
uint32_t height = HIWORD(lParam);
// TODO(kard): handle properly? (what does that even mean)
assert(update_canvas(&canvas, width, height));
}
default:
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
}
int WinMain(
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nShowCmd
) {
redirect_io_to_console();
const wchar_t CLASS_NAME[] = L"sponge";
WNDCLASS wc = { 0 };
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.lpszClassName = CLASS_NAME;
RegisterClass(&wc);
HWND hwnd = CreateWindowEx(
0,
CLASS_NAME,
L"sponge",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, DEFAULT_WIDTH, DEFAULT_HEIGHT,
NULL,
NULL,
hInstance,
NULL
);
if (hwnd == NULL)
return 1;
update_canvas(&canvas, DEFAULT_WIDTH, DEFAULT_HEIGHT);
ShowWindow(hwnd, nShowCmd);
MSG msg = {0};
BOOL running = TRUE;
init();
LARGE_INTEGER qpc_freq;
LARGE_INTEGER qpc_start;
LARGE_INTEGER qpc_end;
LARGE_INTEGER qpc_draw;
LARGE_INTEGER qpc_frame;
QueryPerformanceFrequency(&qpc_freq);
QueryPerformanceCounter(&qpc_start);
while (running) {
QueryPerformanceCounter(&qpc_start);
while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
if (msg.message == WM_QUIT) {
running = FALSE;
break;
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
if (!running) break;
draw_frame(canvas);
QueryPerformanceCounter(&qpc_end);
qpc_draw.QuadPart = qpc_end.QuadPart - qpc_start.QuadPart;
qpc_draw.QuadPart *= 1000000; // microseconds
qpc_draw.QuadPart /= qpc_freq.QuadPart;
HDC hdc = GetDC(hwnd);
StretchDIBits(
hdc,
// TODO(kard): check what happens if canvas is bigger than window (it shouldn't differ currently)
0, 0, canvas.width, canvas.height, // dest rectangle
0, 0, canvas.width, canvas.height, // src rectangle
canvas.pixels,
&bmi,
DIB_RGB_COLORS,
SRCCOPY
);
InvalidateRect(hwnd, NULL, FALSE);
UpdateWindow(hwnd);
QueryPerformanceCounter(&qpc_end);
qpc_frame.QuadPart = qpc_end.QuadPart - qpc_start.QuadPart;
qpc_frame.QuadPart *= 1000000; // microseconds
qpc_frame.QuadPart /= qpc_freq.QuadPart;
fprintf(stderr, "draw time: %3lld.%03lldms, frame time: %3lld.%03lldms\n",
qpc_draw.QuadPart / 1000, qpc_draw.QuadPart % 1000,
qpc_frame.QuadPart / 1000, qpc_frame.QuadPart % 1000);
// TODO(kard):
// 1. this can probably be done cleaner
// 2. resetting after every frame is wrong, it should be a value across frames (see 1.)
if (qpc_frame.QuadPart < TARGET_FRAME_TIME_US) {
LARGE_INTEGER remaining;
LARGE_INTEGER actual_end;
actual_end.QuadPart = qpc_start.QuadPart + (TARGET_FRAME_TIME_US * qpc_freq.QuadPart / 1000000);
remaining.QuadPart = (actual_end.QuadPart - qpc_end.QuadPart) * 1000000 / qpc_freq.QuadPart;
if (remaining.QuadPart > 2000) {
Sleep((remaining.QuadPart - 1000) / 1000);
}
while (qpc_end.QuadPart < actual_end.QuadPart) {
QueryPerformanceCounter(&qpc_end);
}
}
Sleep(16);
}
return (int) msg.wParam;
}
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