d3d9/tests: Add test for base vertex index with sysmem vertex buffers.

dlls/d3d9/tests/visual.c

@@ -24234,6 +24234,11 @@ static void test_sysmem_draw(void)
         {-1.0f,  1.0f, 0.0f},
         { 1.0f, -1.0f, 0.0f},
         { 1.0f,  1.0f, 0.0f},
+
+        {-1.0f, -1.0f, 0.0f},
+        {-1.0f,  1.0f, 0.0f},
+        { 1.0f, -1.0f, 0.0f},
+        { 1.0f,  1.0f, 0.0f},
     };
     static const DWORD quad_s1[] =
     {
@@ -24241,6 +24246,11 @@ static void test_sysmem_draw(void)
         0xff00ff00,
         0xff0000ff,
         0xffffffff,
+
+        0xff443322,
+        0xff443322,
+        0xff443322,
+        0xff443322,
     };
     static const short indices[] = {0, 1, 2, 3};
 
@@ -24349,6 +24359,19 @@ static void test_sysmem_draw(void)
     colour = getPixelColor(device, 320, 240);
     ok(color_match(colour, 0x00007f7f, 1), "Got unexpected colour 0x%08x.\n", colour);
 
+    hr = IDirect3DDevice9_Clear(device, 0, NULL, D3DCLEAR_TARGET, 0x77777777, 0.0f, 0);
+    ok(hr == D3D_OK, "Got unexpected hr %#x.\n", hr);
+
+    hr = IDirect3DDevice9_BeginScene(device);
+    ok(hr == D3D_OK, "Got unexpected hr %#x.\n", hr);
+    hr = IDirect3DDevice9_DrawIndexedPrimitive(device, D3DPT_TRIANGLESTRIP, 4, 0, 4, 0, 2);
+    ok(hr == D3D_OK, "Got unexpected hr %#x.\n", hr);
+    hr = IDirect3DDevice9_EndScene(device);
+    ok(hr == D3D_OK, "Got unexpected hr %#x.\n", hr);
+
+    colour = getPixelColor(device, 320, 240);
+    ok(color_match(colour, 0x00443322, 1), "Got unexpected colour 0x%08x.\n", colour);
+
     hr = IDirect3DDevice9_Present(device, NULL, NULL, NULL, NULL);
     ok(hr == D3D_OK, "Got unexpected hr %#x.\n", hr);