From 18270a2ae92d52b2ef6379f21aae4d0e75b47824 Mon Sep 17 00:00:00 2001
From: Zack Buhman <zack@buhman.org>
Date: Sat, 20 Dec 2025 16:01:28 -0600
Subject: [PATCH] initial

---
 .gitignore |   8 ++++
 Makefile   |  47 ++++++++++++++++++++++
 main.cpp   | 114 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 169 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 main.cpp

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fd55e31
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+*~
+.#*
+*.o
+*.d
+*.s
+*.blend1
+*.zip
+*.exe
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..3ff096d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,47 @@
+.SUFFIXES:
+.INTERMEDIATE:
+.SECONDARY:
+.PHONY: all clean
+
+CC = i686-w64-mingw32-gcc
+CXX = i686-w64-mingw32-g++
+
+CSTD += -std=gnu11
+CXXSTD += -std=gnu++14
+
+CFLAGS += -Wall -Werror -Wfatal-errors
+CFLAGS += -Wno-error=unused-function
+CFLAGS += -Wno-error=unused-variable
+CFLAGS += -DUNICODE
+
+LDFLAGS += -Wl,--subsystem,windows -mwindows -mconsole -municode -ld3d9
+
+OPT = -Og
+
+DEBUG = -g
+
+DEPFLAGS = -MMD -MP
+
+makefile_path := $(dir $(abspath $(firstword $(MAKEFILE_LIST))))
+
+all: main
+
+%.o: %.cpp
+	$(CXX) $(CXXSTD) $(CFLAGS) $(OPT) $(DEBUG) $(DEPFLAGS) -MF ${<}.d -c $< -o $@
+
+%.o: %.c
+	$(CC) $(CSTD) $(CFLAGS) $(CXXFLAGS) $(OPT) $(DEBUG) $(DEPFLAGS) -MF ${<}.d -c $< -o $@
+
+MAIN_OBJS = \
+	main.o
+
+main.exe: $(MAIN_OBJS)
+	$(CXX) $^ -o $@ $(LDFLAGS)
+
+-include $(shell find $(makefile_path) -type f -name '*.d')
+
+%: RCS/%,v
+%: RCS/%
+%: %,v
+%: s.%
+%: SCCS/s.%
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..05a7c43
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,114 @@
+#include <windows.h>
+#include <d3d9.h>
+
+LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
+
+LPDIRECT3D9 g_pD3D = NULL;
+LPDIRECT3DDEVICE9 g_pd3dDevice = NULL;
+
+HRESULT InitDirect3D(HWND hwnd)
+{
+  g_pD3D = Direct3DCreate9(D3D_SDK_VERSION);
+  if (g_pD3D == NULL)
+    return E_FAIL;
+
+  D3DPRESENT_PARAMETERS d3dpp = {};
+  d3dpp.Windowed = TRUE;
+  d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
+  d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
+
+  HRESULT res = g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,
+                                     D3DDEVTYPE_HAL,
+                                     hwnd,
+                                     D3DCREATE_HARDWARE_VERTEXPROCESSING,
+                                     &d3dpp,
+                                     &g_pd3dDevice);
+  if (FAILED(res)) {
+    return E_FAIL;
+  }
+
+  return S_OK;
+}
+
+void Cleanup()
+{
+  if (g_pd3dDevice != NULL)
+    g_pd3dDevice->Release();
+
+  if (g_pD3D != NULL)
+    g_pD3D->Release();
+}
+
+void Render()
+{
+  if (g_pd3dDevice == NULL)
+    return;
+
+  g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 255), 1.0f, 0);
+
+  if (SUCCEEDED(g_pd3dDevice->BeginScene())) {
+    g_pd3dDevice->EndScene();
+  }
+
+  g_pd3dDevice->Present(NULL, NULL, NULL, NULL);
+}
+
+int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow)
+{
+  const wchar_t CLASS_NAME[] = L"Sample Window Class";
+
+  WNDCLASS wc = {};
+
+  wc.lpfnWndProc = WindowProc;
+  wc.hInstance = hInstance;
+  wc.lpszClassName = CLASS_NAME;
+
+  RegisterClass(&wc);
+
+  HWND hwnd = CreateWindowEx(0, // window style
+                             CLASS_NAME, // window class
+                             L"Learn to Program Windows",
+                             WS_OVERLAPPEDWINDOW,
+                             // size and position
+                             CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
+                             NULL, // parent window
+                             NULL, // menu
+                             hInstance, // instance handle
+                             NULL // additional application data
+                             );
+  if (hwnd == NULL) {
+    return 0;
+  }
+
+  if (!SUCCEEDED(InitDirect3D(hwnd)))
+    return 0;
+
+  ShowWindow(hwnd, nCmdShow);
+  UpdateWindow(hwnd);
+
+  MSG msg = { };
+  while (GetMessage(&msg, NULL, 0, 0) > 0) {
+    TranslateMessage(&msg);
+    DispatchMessage(&msg);
+  }
+
+  return 0;
+}
+
+LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
+{
+  switch (uMsg) {
+  case WM_DESTROY:
+    PostQuitMessage(0);
+    return 0;
+
+  case WM_PAINT:
+    {
+      Render();
+      ValidateRect(hwnd, NULL);
+    }
+    return 0;
+  }
+
+  return DefWindowProc(hwnd, uMsg, wParam, lParam);
+}