#include "def_effect.fx"


VSOBJ_NOLIGHT_OUTPUT SkyBox_VS( VSOBJ_INPUT In )
{
    VSOBJ_NOLIGHT_OUTPUT Out = (VSOBJ_NOLIGHT_OUTPUT) 0; 
    float4 pos = In.position;
    float3 normal = In.normal;
    float4 color = In.diffuse;
    float4 output_pos, pos_world;
    int b_index = 0;

    // transform position to screen space before changing it.
    pos_world = mul( pos, blendMatrices[b_index] );
    output_pos = mul( pos_world, view_proj_matrix );
    Out.position = output_pos;

	//apply fog
	//float distfog = saturate((fFogDistEnd - output_pos.z)/(fFogDistEnd - fFogDistStart));
	//float heightfog = saturate((fFogHeightEnd - pos_world.z)/(fFogHeightEnd - fFogHeightStart));
	Out.fog = 1;//min(distfog, heightfog);

    //float3 N = normalize(mul(normal, (float3x3)blendMatrices[b_index])); // normal (view space)
    //float  nLength = length(Light_position - pos_world);
    //float3 L = normalize(Light_position - pos_world);

	//float Atten = 1/(1+Light_ambient.a*nLength);

    // eye-baseÀÇ half-way º¤ÅÍ
    //float3 light_vector = -Light_direction_forsp;
    //float3 eye_vector = Camera_position - pos_world;
    //float3 halfway = normalize(normalize(light_vector) + normalize(eye_vector));
    
	float fValue = (pos_world.z-fSky_Min_height)/(fSky_Max_height-fSky_Min_height);
	fValue = saturate( fValue );

    Out.diffuse   = Sky_Light_High * fValue + Sky_Light_Low * (1-fValue);// * ddot * Atten + Light_specular * pow(dotval, 7);     // diffuse + ambient 
	Out.diffuse.a = 1;
    Out.texCoord  = In.texCoord;

    return Out;
}

VSCLOUD_OUTPUT CloudSpread_VS( VSCLOUD_INPUT In )
{
    VSOBJ_NOLIGHT_OUTPUT Out = (VSCLOUD_OUTPUT) 0;
    float4 pos = In.position;
    float3 normal = In.normal;
    float4 color = In.diffuse;
    float4 output_pos, pos_world;
    int b_index = 0;

	pos_world = mul( pos, blendMatrices[b_index] );
//	pos_world = pos;

    float dVal = length(float2(pos_world.x, pos_world.y) - float2(CloudSpread_Center.x, CloudSpread_Center.y));
    dVal = pow(saturate((CloudSpread_CornerDistance - dVal)/CloudSpread_CornerDistance), 2);
    pos_world.z -= (1-dVal)*CloudSpread_BalanceHeight;
    //pos_world.z -= (dVal)*CloudSpread_BalanceHeight;

    // transform position to screen space before changing it.
    output_pos = mul( pos_world, view_proj_matrix );
    Out.position = output_pos;

	//apply fog
	//float distfog = saturate((fFogDistEnd - output_pos.z)/(fFogDistEnd - fFogDistStart));
	//float heightfog = saturate((fFogHeightEnd - pos_world.z)/(fFogHeightEnd - fFogHeightStart));
	Out.fog = 1;//min(distfog, heightfog);


    //float3 N = normalize(mul(normal, (float3x3)blendMatrices[b_index])); // normal (view space)
    //float  nLength = length(Light_position - pos_world);
    //float3 L = normalize(Light_position - pos_world);

	//float Atten = 1/(1+Light_ambient.a*nLength);

    // eye-baseÀÇ half-way º¤ÅÍ
    //float3 light_vector = -Light_direction_forsp;
    //float3 eye_vector = Camera_position - pos_world;
    //float3 halfway = normalize(normalize(light_vector) + normalize(eye_vector));

	//float ddot = saturate(dot(N, L));
	//float sdot = saturate(dot(N, halfway));

    //Out.diffuse   = colorLight_ambient + max(Light_diffuse * ddot * Atten, Light_specular * pow(sdot, 7));     // diffuse + ambient 
	//Out.diffuse.a = fVisibility;
	float fValue = (pos_world.z-fSky_Min_height)/(fSky_Max_height-fSky_Min_height);
	fValue = saturate( fValue );

	float4 output_color = Sky_Light_High * fValue + Sky_Light_Low * (1-fValue);
    Out.diffuse   = (1 - fVisibility)*output_color + fVisibility*color;     // diffuse + ambient 
	Out.diffuse.a = color.a/255;

    Out.texCoord1  = In.texCoord1;	// [sonador]
    //Out.texCoord2  = In.texCoord2;	// [sonador]
	//float heightturm = (pos_world.z - fTerrainTextureCenter.z);
	//float4 litproj = heightturm*float4(L.x, L.y, L.z, L.z);///L.z;
    //Out.texCoord2  = fTerrain1stTextureScale * (pos_world - fTerrainTextureCenter - litproj);
	//heightturm = (pos_world.z - fTerrainTextureCenterDusk.z);
	//litproj = heightturm*float4(L.x, L.y, L.z, L.z);///L.z;
    //Out.texCoord3  = fTerrain2ndTextureScale * (pos_world - fTerrainTextureCenterDusk - litproj);

    return Out;
}

technique SkyBox_Tech
{
    pass P0
    {
		VertexShader = compile vs_1_1 SkyBox_VS();
        PixelShader = NULL;
    }
}

technique CloudSpread_Tech
{
    pass P0
    {
		VertexShader = compile vs_1_1 CloudSpread_VS();
        PixelShader = NULL;
    }
}