#include <IL/il.h>
#include <string>
#include <assert.h>
 
// Use this macro to verify if D3D10 function succeeded
#define HV(x) if(!SUCCEEDED(x)) MessageBox(NULL, #x, "HRESULT fail", MB_OK)
 
// Creates a shader resource view given a filepath & D3D10 device
//	@filePath - String of the file path of the image file
//	@pDevice - Pointer to the D3D10 device
ID3D10ShaderResourceView* MakeSRV( const std::string& filePath, ID3D10Device* pDevice )
{
	// Will be filled and returned
	ID3D10ShaderResourceView* pSRV = NULL;
 
	// Load image from DevIL
	ILuint idImage;
	ilGenImages( 1, &idImage );
	ilBindImage( idImage );
	ilLoadImage( filePath.c_str() );
	assert ( IL_NO_ERROR == ilGetError() );
 
	// Fetch dimensions of image
	int width = ilGetInteger( IL_IMAGE_WIDTH );
	int height = ilGetInteger( IL_IMAGE_HEIGHT );
 
	// Load the data
	ilConvertImage( IL_RGBA,IL_UNSIGNED_BYTE );
	unsigned char * pData = ilGetData();
 
	// Build the texture header descriptor
	D3D10_TEXTURE2D_DESC descTex;
	descTex.Width = width;
	descTex.Height = height;
	descTex.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
	descTex.Usage = D3D10_USAGE_DEFAULT;
	descTex.BindFlags = D3D10_BIND_SHADER_RESOURCE | D3D10_BIND_RENDER_TARGET;
	descTex.CPUAccessFlags = 0;
	descTex.MipLevels = 1;
	descTex.ArraySize = 1;
	descTex.SampleDesc.Count = 1;
	descTex.SampleDesc.Quality = 0;
	descTex.MiscFlags = D3D10_RESOURCE_MISC_GENERATE_MIPS;
 
	// Resource data descriptor
	D3D10_SUBRESOURCE_DATA data ;
	memset( &data, 0, sizeof(D3D10_SUBRESOURCE_DATA));
	data.pSysMem = pData;
	data.SysMemPitch = 4 * width;
 
	// Create the 2d texture from data
	ID3D10Texture2D * pTexture = NULL;
	HV( pDevice->CreateTexture2D( &descTex, &data, &pTexture ));
 
	// Create resource view descriptor
	D3D10_SHADER_RESOURCE_VIEW_DESC srvDesc;
	srvDesc.Format = descTex.Format;
	srvDesc.ViewDimension = D3D10_SRV_DIMENSION_TEXTURE2D;
	srvDesc.Texture2D.MostDetailedMip = 0;
	srvDesc.Texture2D.MipLevels = D3D10_RESOURCE_MISC_GENERATE_MIPS ;
 
	// Create the shader resource view
	HV( pDevice->CreateShaderResourceView( pTexture, &srvDesc, &pSRV ));
 
	// Delete from IL buffer after image loaded correctly
	ilDeleteImages( 1, &idImage );
	idImage = 0;
 
	return pSRV;
}