etqw-sdk/base/renderprogs/megatexture/oob.rprog

renderProgram megaTexture/oob {
	
	program vertex cg { <%
		struct VsInputs {
			float3 pos	: $positionAttrib;
			float2 tex	: $texCoordAttrib;
			float3 norm	: $normalAttrib;
			float4 color: $colorAttrib;
			$if r_32ByteVtx
			float4 signs : $signAttrib;
			$endif
		};

		struct VsOutputs {
			float2 tex	: TEXCOORD0;
			float3 norm	: TEXCOORD1;

			float4 megaCoords0 : TEXCOORD2;
			float4 megaCoords1 : TEXCOORD3;
			float4 megaCoords2 : TEXCOORD4;
			float4 megaCoords3 : TEXCOORD5;

			float4 color	: COLOR0;
		};

		uniform float3 toSun 	: $sunDirection;

		uniform float4 megaParms0 : $megaMaskParams_0;
		uniform float4 megaParms1 : $megaMaskParams_1;
		uniform float4 megaParms2 : $megaMaskParams_2;
		uniform float4 megaParms3 : $megaMaskParams_3;
		uniform float4 megaParms4 : $megaTextureParams_0;
		uniform float4 megaParms5 : $megaTextureParams_1;
		uniform float4 megaParms6 : $megaTextureParams_2;
		uniform float4 megaParms7 : $megaTextureParams_3;
		
		float GetZ( float2 value, float sign ) {
			return ( sqrt( 1.0f - ( dot( value.xy, value.xy ) ) ) * ( sign - 1.f ) );
		}
		

		VsOutputs vertex(VsInputs indata) {
			VsOutputs outData;

			$if r_32ByteVtx
			indata.tex *= 1.f/4096.f;
			indata.norm.xy *= 1.f / 32767.f;
			indata.norm.z = GetZ( indata.norm.xy, indata.signs.x );
			$endif
			
			outData.tex = indata.tex;
			outData.norm = indata.norm;
			outData.color = dot( indata.norm, toSun );

			outData.megaCoords0.xy = indata.tex * megaParms0.w + megaParms0.xy;
			outData.megaCoords1.xy = indata.tex * megaParms1.w + megaParms1.xy;
			outData.megaCoords2.xy = indata.tex * megaParms2.w + megaParms2.xy;
			outData.megaCoords3.xy = indata.tex * megaParms3.w + megaParms3.xy;

			outData.megaCoords0.zw = indata.tex * megaParms4.xy;
			outData.megaCoords1.zw = indata.tex * megaParms5.xy;
			outData.megaCoords2.zw = indata.tex * megaParms6.xy;
			outData.megaCoords3.zw = indata.tex * megaParms7.xy;

			return outData;
		}
	%> }

	program fragment cg { <%

		struct VsOutputs {
			float2 tex		: TEXCOORD0;
			float3 norm		: TEXCOORD1;

			float4 megaCoords0 : TEXCOORD2;
			float4 megaCoords1 : TEXCOORD3;
			float4 megaCoords2 : TEXCOORD4;
			float4 megaCoords3 : TEXCOORD5;

			float4 color	: COLOR0;
		};

		uniform float4 megaParms0 : megaTextureParams_0;
		uniform float4 megaParms1 : megaTextureParams_1;
		uniform float4 megaParms2 : megaTextureParams_2;
		uniform float4 megaParms3 : megaTextureParams_3;

		sampler2D megaMask 	: $borderClampMap;
		sampler2D megaTexture0	: $megaTextureLevel_0;
		sampler2D megaTexture1	: $megaTextureLevel_1;
		sampler2D megaTexture2	: $megaTextureLevel_2;
		sampler2D megaTexture3	: $megaTextureLevel_3;
		samplerCUBE ambientCubemap : $ambientCubeMap;
		uniform float ambientBrightness : $ambientBrightness;

		uniform float4 sunColor	: $sunColor;	//Fragment

		float4 fragment(VsOutputs  indata) : COLOR {
			float4 mask;

			// Load the masks ( cg compiler generates some suboptimal code for this :( )
			mask.x = tex2D( megaMask, indata.megaCoords0.xy ).x;
			mask.y = tex2D( megaMask, indata.megaCoords1.xy ).y;
			mask.z = tex2D( megaMask, indata.megaCoords2.xy ).z;
			mask.w = tex2D( megaMask, indata.megaCoords3.xy ).w;
			float4 invMask = 1.0f-mask;

			// Lookup the different levels
			float4 mega0 = tex2D( megaTexture0, indata.megaCoords0.zw );
			float4 mega1 = tex2D( megaTexture1, indata.megaCoords1.zw );
			float4 mega2 = tex2D( megaTexture2, indata.megaCoords2.zw );
			float4 mega3 = tex2D( megaTexture3, indata.megaCoords3.zw );

			// Merge levels together
			float4 comb = mega0;
			comb *= invMask.y;
			comb += mega1 * mask.y;
			comb *= invMask.z;
			comb += mega2 * mask.z;
			comb *= invMask.w;
			comb += mega3 * mask.w;

			float4 amb = texCUBE( ambientCubemap, indata.norm ) * ambientBrightness;
			return min( amb * comb, 1 ) + min( comb.a * indata.color * sunColor * comb, 1 );
		}
	%> }	
}