struct vertex
{
    float4 position : POSITION;
    float4 normal   : NORMAL;
    float4 color0   : COLOR0;
    float2 texcoord0 : TEXCOORD0;
};

struct fragment
{
    float4 position : POSITION;
    float4 color0   : COLOR0;
    float2 texcoord0 : TEXCOORD0;
};


fragment main( vertex IN, 
               uniform float4x4 modelViewProjection,
               uniform float4x4 modelViewInverse,
		uniform float4 eyePosition,
               uniform float4 lightVector,
	       uniform sampler2D testTexture: TEXUNIT0
	       )
{
    fragment OUT;

    OUT.position = mul( modelViewProjection, IN.position );

    // Transform normal from model-space to view-space
    float4 normal = normalize( mul( modelViewInverse, IN.normal ).xyzz );

    // Store normalized light vector
    float4 light = normalize( lightVector );

    // Calculate half angle vector
    float4 eye = eyePosition;
    float4 half = normalize( light + eye );
    
    // Calculate diffuse component
    float diffuse = dot( normal, light );

    // Calculate specular component
    float specular = dot( normal, half );
    specular = pow( specular, 32 );

    // A little ambient color
    float4 ambientColor = float4(0,0,0, 1.0 );

    // White specular
    float4 specularMaterial = float4( .9,.9,.9, 1.0 );

    // Combine diffuse and specular contributions and output final vertex color
    OUT.color0 = tex2D(testTexture, IN.texcoord0 );
    //OUT.color0 = diffuse * IN.color0 + specular * specularMaterial + ambientColor ;

    return OUT;
}

void initShader_cg(void){	if( cgGLIsProfileSupported(CG_PROFILE_ARBFP1) )        g_CGprofile_pixel = CG_PROFILE_ARBFP1;    else if( cgGLIsProfileSupported(CG_PROFILE_FP30) )        g_CGprofile_pixel = CG_PROFILE_FP30;	else if( cgGLIsProfileSupported(CG_PROFILE_FP20) )        g_CGprofile_pixel = CG_PROFILE_FP20;    else    {        MessageBox( NULL,"Failed to initialize pixel shader! Hardware doesn't "			        "support any of the pixel shading extensions!",			        "ERROR",MB_OK|MB_ICONEXCLAMATION );		return;    }    if( cgGLIsProfileSupported(CG_PROFILE_ARBVP1) )        g_CGprofile2 = CG_PROFILE_ARBVP1;    else if( cgGLIsProfileSupported(CG_PROFILE_VP30) )        g_CGprofile2 = CG_PROFILE_VP30;	else if( cgGLIsProfileSupported(CG_PROFILE_VP20) )        g_CGprofile2 = CG_PROFILE_VP20;    else    {        MessageBox( NULL,"Failed to initialize vertex shader! Hardware doesn't "			        "support any of the vertex shading extensions!",			        "ERROR",MB_OK|MB_ICONEXCLAMATION );		return;    }	// Create the context...	g_CGcontext2 = cgCreateContext();	//	// Create the vertex shader...	//		g_CGprogram2 = cgCreateProgramFromFile( g_CGcontext2,										   CG_SOURCE,										   "shaders/ogl_cg_lighting.cg",										   g_CGprofile2,										   NULL, 										   NULL );	//	// Load the program using Cg's expanded interface...	//	cgGLLoadProgram( g_CGprogram2 );	//	// Bind some parameters by name so we can set them later...	//	g_CGparam_modelViewProj2    = cgGetNamedParameter( g_CGprogram2, "modelViewProjection" );	g_CGparam_modelViewInverse2 = cgGetNamedParameter( g_CGprogram2, "modelViewInverse" );	g_CGparam_eyePosition2      = cgGetNamedParameter( g_CGprogram2, "eyePosition" );	g_CGparam_lightVector2      = cgGetNamedParameter( g_CGprogram2, "lightVector");}

	// This matrix will be used to tansform the vertices from model-space to clip-space	cgGLSetStateMatrixParameter( g_CGparam_modelViewProj2,							     CG_GL_MODELVIEW_PROJECTION_MATRIX,							     CG_GL_MATRIX_IDENTITY );	// This matrix will be used to transform the normals from model-space to view-space	cgGLSetStateMatrixParameter( g_CGparam_modelViewInverse2,							     CG_GL_MODELVIEW_MATRIX,                                 CG_GL_MATRIX_INVERSE_TRANSPOSE );    fLightVector[0] = 0;	fLightVector[1] = 1270*cos(camerax_pov*M_PI/180.0f);	fLightVector[2] = 560;	// Normalize light vector    float fLength = sqrtf( fLightVector[0]*fLightVector[0] +                           fLightVector[1]*fLightVector[1] +                           fLightVector[2]*fLightVector[2] );	fLightVector[0] /= fLength;	fLightVector[1] /= fLength;	fLightVector[2] /= fLength;    cgGLSetParameter4fv( g_CGparam_eyePosition2, fEyePosition );	cgGLSetParameter4fv( g_CGparam_lightVector2, fLightVector );	cgGLBindProgram( g_CGprogram2 );	cgGLEnableProfile( g_CGprofile2 );RenderObjects();cgGLDisableProfile( g_CGprofile2 );