D3D10 with SDL

#include "SDL.h"
#include "SDL_syswm.h"

#include <d3d10.h>
#include <d3dx10.h>

ID3D10Device * d3ddevice;
IDXGISwapChain * swap_chain;
ID3D10RenderTargetView * render_target_view;

int main(int argc, char *argv[])
{
	// initialize sdl. normally one should check for errors here
	SDL_Init(SDL_INIT_VIDEO);
	SDL_SetVideoMode(640, 480, 32, 0);

	// this retrieves the HWND of the window required later
	SDL_SysWMinfo info;
	SDL_VERSION(&info.version);
	SDL_GetWMInfo(&info);

	// initialize the swap chain structure to some reasonable defaults
	DXGI_SWAP_CHAIN_DESC swap_chain_desc;
	ZeroMemory(&swap_chain_desc, sizeof(swap_chain_desc));

	swap_chain_desc.BufferDesc.Width = 640;
	swap_chain_desc.BufferDesc.Height = 480;
	swap_chain_desc.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
	swap_chain_desc.BufferDesc.RefreshRate.Denominator = 60;
	swap_chain_desc.BufferDesc.RefreshRate.Denominator = 1;
	swap_chain_desc.BufferCount = 1;
	swap_chain_desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
	swap_chain_desc.SampleDesc.Count = 1;
	swap_chain_desc.SampleDesc.Quality = 0;
	swap_chain_desc.OutputWindow = info.window;
	swap_chain_desc.Windowed = TRUE;

	// create device and swap chain. could fail, so in production quality code 
	// you would have to test for errors.
	D3D10CreateDeviceAndSwapChain(
		0,
		D3D10_DRIVER_TYPE_HARDWARE, 
		0,
		D3D10_CREATE_DEVICE_DEBUG,
		D3D10_SDK_VERSION, 
		&swap_chain_desc,
		&swap_chain,
		&d3ddevice
	);

	// create a render target view for the swap chain to actually render to.
	ID3D10Texture2D * back_buffer;
	swap_chain->GetBuffer(
		0,
		IID_ID3D10Texture2D, // could use __uuidof() but that isn't portable
		(LPVOID*)&back_buffer);
	d3ddevice->CreateRenderTargetView(back_buffer, 0, &render_target_view);
	back_buffer->Release();

	// we will render to render_target_view
	d3ddevice->OMSetRenderTargets(1, &render_target_view, 0);

	// we have to define a viewport
	D3D10_VIEWPORT viewport;
	viewport.Width = 640;
	viewport.Height = 480;
	viewport.MinDepth = 0.0f;
	viewport.MaxDepth = 1.0f;
	viewport.TopLeftX = 0;
	viewport.TopLeftY = 0;
	d3ddevice->RSSetViewports(1, &viewport);

	// clear with blue color an show the result
	d3ddevice->ClearRenderTargetView(render_target_view, 
		D3DXCOLOR(0.0f, 0.0f, 1.0f, 0.0f));
	swap_chain->Present(0, 0);
	
	// wait for the quit event
	SDL_Event e;
	while (SDL_WaitEvent(&e) && e.type != SDL_QUIT);

	// unbind render targets before deletion
	d3ddevice->OMSetRenderTargets(0, 0, 0);

	// clean everything up
	render_target_view->Release();
	swap_chain->Release();
	d3ddevice->Release();

	// shutdown
	SDL_Quit();
	return 0;
}