draw a triangle using fixed-function pipeline

main.cpp

@@ -1,10 +1,25 @@
 #include <windows.h>
 #include <d3d9.h>
+#include <stdint.h>
+
+struct CUSTOMVERTEX {
+  float x, y, z, rhw;
+  uint32_t color;
+};
+
+#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZRHW|D3DFVF_DIFFUSE)
+
+const CUSTOMVERTEX vertices[] = {
+  { 150.0f,  50.0f, 0.5f, 1.0f, 0xffff0000 },
+  { 250.0f, 250.0f, 0.5f, 1.0f, 0xff00ff00 },
+  {  50.0f, 250.0f, 0.5f, 1.0f, 0xff00ffff },
+};
 
 LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
 
-LPDIRECT3D9 g_pD3D = NULL;
-LPDIRECT3DDEVICE9 g_pd3dDevice = NULL;
+IDirect3D9 * g_pD3D = NULL;
+IDirect3DDevice9 * g_pd3dDevice = NULL;
+IDirect3DVertexBuffer9 * g_pVB = NULL;
 
 HRESULT InitDirect3D(HWND hwnd)
 {
@@ -46,9 +61,11 @@ void Render()
 
   g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 255), 1.0f, 0);
 
-  if (SUCCEEDED(g_pd3dDevice->BeginScene())) {
+  g_pd3dDevice->BeginScene();
+  g_pd3dDevice->SetStreamSource(0, g_pVB, 0, (sizeof (CUSTOMVERTEX)));
+  g_pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX);
+  g_pd3dDevice->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);
   g_pd3dDevice->EndScene();
-  }
 
   g_pd3dDevice->Present(NULL, NULL, NULL, NULL);
 }
@@ -83,6 +100,27 @@ int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine
   if (!SUCCEEDED(InitDirect3D(hwnd)))
     return 0;
 
+  HRESULT res;
+
+  res = g_pd3dDevice->CreateVertexBuffer(3 * (sizeof (CUSTOMVERTEX)), // length
+                                         0, // usage
+                                         D3DFVF_CUSTOMVERTEX, // FVF
+                                         D3DPOOL_DEFAULT, // Pool
+                                         &g_pVB, //ppVertexBuffer
+                                         NULL //pSharedHandle
+                                         );
+  if (FAILED(res))
+    return 0;
+
+  void * pVertices;
+  res = g_pVB->Lock(0, (sizeof (vertices)), &pVertices, 0);
+  if (FAILED(res))
+    return 0;
+
+  memcpy(pVertices, vertices, (sizeof (vertices)));
+
+  g_pVB->Unlock();
+
   ShowWindow(hwnd, nCmdShow);
   UpdateWindow(hwnd);
 
@@ -105,7 +143,7 @@ LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
   case WM_PAINT:
     {
       Render();
-      ValidateRect(hwnd, NULL);
+      //ValidateRect(hwnd, NULL);
     }
     return 0;
   }