
#include "def_effect.fx"


//=============================================================================
//지형
VSTERRAIN_OUTPUT Terrain_VS( VSTERRAIN_INPUT In )
{
    VSTERRAIN_OUTPUT Out = (VSTERRAIN_OUTPUT) 0;
    float4 pos = In.position;
    float3 normal = In.normal;
    float4 color = In.color;
    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 = min(distfog, heightfog);


    float  nLength = length(Light_position - pos_world);
    float3 L = normalize(Light_position - pos_world);

	float Atten = 1/(1+Light_ambient.a*nLength);
	
    // eye-base의 half-way 벡터
    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(normal, L));
    float sdot = saturate(dot(normal, halfway));

    Out.diffuse   = color;// + color * ddot;     // diffuse + ambient
    Out.diffuse.a = color.a;
	Out.specular  =	(Light_ambient + Light_diffuse * ddot * Atten) + (Light_specular * pow(sdot, 22));

	// 지형 텍스처 연산 추가
    Out.texCoord1  = fTerrain1stTextureScale * (pos_world - fTerrainTextureCenter);
    Out.texCoord2  = fTerrain2ndTextureScale * (pos_world - fTerrainTextureCenter);
    Out.texCoord3  = fTerrain3thTextureScale * (pos_world - fTerrainTextureCenter);
    Out.texCoord4  = fTerrain4thTextureScale * pos;	// 얘만 특이한 것

    return Out;
}

// 안쓰임
VSTERRAIN_OUTPUT TerrainShadow_VS( VSTERRAIN_INPUT In )
{
    VSTERRAIN_OUTPUT Out = (VSTERRAIN_OUTPUT) 0;
    float4 pos = In.position;
    float3 normal = In.normal;
    float4 color = In.color;
    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 = min(distfog, heightfog);


    float  nLength = length(Light_position - pos_world);
    float3 L = normalize(Light_position - pos_world);

    // eye-base의 half-way 벡터
    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(normal, L));
    //float sdot = saturate(dot(normal, halfway));

    Out.diffuse   = color;// + color * ddot;     // diffuse + ambient
    Out.diffuse.a = color.a;
	//Out.specular  =	(Light_ambient + Light_diffuse * ddot * Atten) + (Light_specular * pow(sdot, 22));

	// 지형 텍스처 연산 추가
	float heightturm = (pos_world.z - fTerrainTextureCenter.z);
	float4 litproj = heightturm*float4(L.x, L.y, L.z, L.z);///L.z;
    Out.texCoord1  = 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.texCoord2  = fTerrain2ndTextureScale * (pos_world - fTerrainTextureCenterDusk - litproj);

    return Out;
}


//============================================================================= 
//지형 테크닉
technique TerrainTech
{
	pass P0
	{
		VertexShader = compile vs_1_1 Terrain_VS();
        PixelShader = NULL;
	}
}
technique TerrainShadowTech
{
	pass P0
	{
		VertexShader = compile vs_1_1 TerrainShadow_VS();
        PixelShader = NULL;
	}
}