// these are special blends used internally in megaGen,
// don't use them for anything if you don't have a clue

renderBinding blendParm_0 { vector { 0 } }
renderBinding blendParm_1 { vector { 0 } }
renderBinding blendParm_2 { vector { 0 } }
renderBinding blendParm_3 { vector { 0 } }
renderBinding blendParm_4 { vector { 0 } }
renderBinding blendParm_5 { vector { 0 } }
renderBinding blendParm_6 { vector { 0 } }
renderBinding blendParm_7 { vector { 0 } }
renderBinding blendParm_8 { vector { 0 } }

template megagen/blends/parallelProjection {
	text { <%
		TEMP colorDest, colorSource;

		TEX colorSource, fragment.texcoord[0], texture[0], 2D;
		$ifdef uvTypeParallel
			TEX colorSource.rgb, fragment.texcoord[2], texture[3], 2D;
		$endif
		TEX colorDest, fragment.texcoord[1], texture[1], 2D;

		$ifdef projectionPattern
			PARAM	consts = { 3.14159265358979323846, 0, 0, 0 };	# pi

			TEMP colorProjectionPattern, _R0, _R1;
			TEX colorProjectionPattern, fragment.texcoord[2], texture[4], 2D;

			# modify alpha with pattern
			ADD _R0.a, colorProjectionPattern.x, -0.5;
			MUL _R1.a, colorSource.a, consts.x;
			SIN _R1.a, _R1.a;
			MUL _R0.a, _R1.a, _R0.a;
			ADD_SAT colorSource.a, colorSource.a, _R0.a;
			
			# Increase contrast
			ADD _R0.a, colorSource.a, -$blendParm_1.x;		# ramp start clamp
			MUL _R1.a, $blendParm_1.y, consts.x;
			MUL _R1.a, _R1.a, _R0.a;
			COS _R1.a, _R1.a;
			MAD _R1.a, _R1.a, -0.5, 0.5;
			CMP _R1.a, _R0.a, 0, _R1;
			ADD _R0.a, colorSource.a, -$blendParm_1.z;		# ramp end clamp
			CMP colorSource.a, _R0.a, _R1.a, 1;
		$endif

		LRP result.color.rgb, colorSource.a, colorSource, colorDest;
		
		MOV result.color.a, 1;
	%> }
}

renderProgram megagen/blends/parallelProjection {
	program vertex arb { <%
		OPTION ARB_position_invariant;
		
		MOV result.texcoord[0], vertex.texcoord[0];
		MOV result.texcoord[1], vertex.texcoord[1];
		MOV result.texcoord[2], vertex.texcoord[2];
	%> }

	program fragment arb { <%
		$define uvTypeParallel
		useTemplate megagen/blends/parallelProjection<>
	%> }
}

renderProgram megagen/blends/parallelProjectionWithProjectionPattern {
	program vertex reference megagen/blends/parallelProjection

	program fragment arb { <%
		$define uvTypeParallel
		$define projectionPattern
		useTemplate megagen/blends/parallelProjection<>
	%> }
}

blend blendWithParallelProjection {
	fragmentProgram {
		program megagen/blends/parallelProjection
	}
}

blend blendWithParallelProjectionAndProjectionPattern {
	fragmentProgram {
		program megagen/blends/parallelProjectionWithProjectionPattern
		parm 0	0, 0, 0, 0
		parm 1	0.5 - 0.5 * parm3, 1.0 / parm3, 0.5 + 0.5 * parm3, 0
	}
}

template megagen/blends/addNormals {
	text { <%
		TEMP colorDest, colorSource, scalar, R0, R1;

		PARAM	subOne = { -1, -1, -1, -1 };
		PARAM	scaleTwo = { 2, 2, 2, 2 };

		TEX colorSource, fragment.texcoord[0], texture[0], 2D;
		$ifdef uvTypeParallel
			TEX colorSource.rgb, fragment.texcoord[2], texture[3], 2D;
		$endif
		TEX colorDest, fragment.texcoord[1], texture[1], 2D;

		$ifdef projectionPattern
			PARAM	consts = { 3.14159265358979323846, 0, 0, 0 };	# pi

			TEMP colorProjectionPattern, _R0, _R1;
			TEX colorProjectionPattern, fragment.texcoord[2], texture[4], 2D;

			# modify alpha with pattern
			ADD _R0.a, colorProjectionPattern.x, -0.5;
			MUL _R1.a, colorSource.a, consts.x;
			SIN _R1.a, _R1.a;
			MUL _R0.a, _R1.a, _R0.a;
			ADD_SAT colorSource.a, colorSource.a, _R0.a;
			
			# Increase contrast
			ADD _R0.a, colorSource.a, -$blendParm_1.x;		# ramp start clamp
			MUL _R1.a, $blendParm_1.y, consts.x;
			MUL _R1.a, _R1.a, _R0.a;
			COS _R1.a, _R1.a;
			MAD _R1.a, _R1.a, -0.5, 0.5;
			CMP _R1.a, _R0.a, 0, _R1;
			ADD _R0.a, colorSource.a, -$blendParm_1.z;		# ramp end clamp
			CMP colorSource.a, _R0.a, _R1.a, 1;
		$endif

		#
		# ADDNORMALS
		#

		MOV scalar.x, colorSource.a;
		ADD scalar.y, 1, -scalar.x;

		# Decode normals
		MAD	colorDest, colorDest, scaleTwo, subOne;
		MAD	colorSource, colorSource, scaleTwo, subOne;
		
		CMP colorSource.z, colorSource.z, -colorSource.z, colorSource.z;

		# Flatten normals
		RCP R0, colorSource.z;
		MUL scalar.x, scalar, R0;
		MUL colorSource.xy, scalar.x, colorSource;
		MOV colorSource.z, 1;

		RCP R1, colorDest.z;
		MUL scalar.y, scalar, R1;
		MUL colorDest.xy, scalar.y, colorDest;

		# Add together
		ADD colorSource.xy, colorSource, colorDest;

		# Normalize
		DP3	R1, colorSource, colorSource;
		RSQ	R1, R1.x;
		MUL	R1, R1.x, colorSource;

		# Encode normals
		MAD	result.color.rgb, R1, .5, .5;
		MOV result.color.a, 1;
	%> }
}

renderProgram megagen/blends/addNormals {
	program vertex arb { <%
		OPTION ARB_position_invariant;
		
		MOV result.texcoord[0], vertex.texcoord[0];
		MOV result.texcoord[1], vertex.texcoord[1];
	%> }

	program fragment arb { <%
		useTemplate megagen/blends/addNormals<>
	%> }
}

renderProgram megagen/blends/addNormalsWithParallelProjection {
	program vertex reference megagen/blends/addNormals

	program fragment arb { <%
		$define uvTypeParallel
		useTemplate megagen/blends/addNormals<>
	%> }
}

renderProgram megagen/blends/addNormalsWithParallelProjectionAndProjectionPattern {
	program vertex reference megagen/blends/addNormals

	program fragment arb { <%
		$define uvTypeParallel
		$define projectionPattern
		useTemplate megagen/blends/addNormals<>
	%> }
}

blend addNormals {
	colorMod

	fragmentProgram {
		program megagen/blends/addNormals
	}
}

blend addNormalsWithParallelProjection {
	colorMod

	fragmentProgram {
		program megagen/blends/addNormalsWithParallelProjection
	}
}

blend addNormalsWithParallelProjectionAndProjectionPattern {
	colorMod

	fragmentProgram {
		program megagen/blends/addNormalsWithParallelProjectionAndProjectionPattern
		parm 0	0, 0, 0, 0
		parm 1	0.5 - 0.5 * parm3, 1.0 / parm3, 0.5 + 0.5 * parm3, 0
	}
}


template megagen/blends/addNormalsWithHeightmaps {
	text { <%
		TEMP colorDest, colorSource, colorHeight, scalar, R0, R1;

		PARAM	subOne = { -1, -1, -1, -1 };
		PARAM	scaleTwo = { 2, 2, 2, 2 };

		TEX colorSource, fragment.texcoord[0], texture[0], 2D;
		$ifdef uvTypeParallel
			TEX colorSource.rgb, fragment.texcoord[2], texture[3], 2D;
		$endif
		TEX colorDest, fragment.texcoord[1], texture[1], 2D;
		TEX colorHeight, fragment.texcoord[1], texture[2], 2D;

		$ifdef projectionPattern
			PARAM	consts = { 3.14159265358979323846, 0, 0, 0 };	# pi

			TEMP colorProjectionPattern, _R0, _R1;
			TEX colorProjectionPattern, fragment.texcoord[2], texture[4], 2D;

			# modify alpha with pattern
			ADD _R0.a, colorProjectionPattern.x, -0.5;
			MUL _R1.a, colorSource.a, consts.x;
			SIN _R1.a, _R1.a;
			MUL _R0.a, _R1.a, _R0.a;
			ADD_SAT colorSource.a, colorSource.a, _R0.a;
			
			# Increase contrast
			ADD _R0.a, colorSource.a, -$blendParm_1.x;		# ramp start clamp
			MUL _R1.a, $blendParm_1.y, consts.x;
			MUL _R1.a, _R1.a, _R0.a;
			COS _R1.a, _R1.a;
			MAD _R1.a, _R1.a, -0.5, 0.5;
			CMP _R1.a, _R0.a, 0, _R1;
			ADD _R0.a, colorSource.a, -$blendParm_1.z;		# ramp end clamp
			CMP colorSource.a, _R0.a, _R1.a, 1;
		$endif

		#
		# INTERSECT HEIGHTMAPS
		#

		ADD R0.x, colorHeight.r, -$blendParm_0.x;
		ADD R0.y, colorHeight.r, -$blendParm_0.y;

		ADD R0.z, colorHeight.r, -$blendParm_0.x;
		MAD R0.z, R0.z, -$blendParm_0.z, 1;

		CMP R0.z, R0.x, 1, R0.z;
		CMP R0.z, R0.y, R0.z, 0;

		MUL colorSource.a, R0.z, colorSource.a;

		#
		# ADDNORMALS
		#

		MOV scalar.x, colorSource.a;
		ADD scalar.y, 1, -scalar.x;

		# Decode normals
		MAD	colorDest, colorDest, scaleTwo, subOne;
		MAD	colorSource, colorSource, scaleTwo, subOne;
		
		CMP colorSource.z, colorSource.z, -colorSource.z, colorSource.z;

		# Flatten normals
		RCP R0, colorSource.z;
		MUL scalar.x, scalar, R0;
		MUL colorSource.xy, scalar.x, colorSource;
		MOV colorSource.z, 1;

		RCP R1, colorDest.z;
		MUL scalar.y, scalar, R1;
		MUL colorDest.xy, scalar.y, colorDest;

		# Add together
		ADD colorSource.xy, colorSource, colorDest;

		# Normalize
		DP3	R1, colorSource, colorSource;
		RSQ	R1, R1.x;
		MUL	R1, R1.x, colorSource;

		# Encode normals
		MAD	result.color.rgb, R1, .5, .5;
		MOV result.color.a, 1;
	%> }
}

// HeightMap based blending
// parm[0].x: lower clip height (parm0 - 0.5 * parm1)
// parm[0].y: upper clip height (parm0 + 0.5 * parm1)
// parm[0].z: one over clip height distance

renderProgram megagen/blends/addNormalsWithHeightmaps {
	program vertex arb { <%
		OPTION ARB_position_invariant;

		MOV result.texcoord[0], vertex.texcoord[0];
		MOV result.texcoord[1], vertex.texcoord[1];
		MOV result.texcoord[2], vertex.texcoord[2];
	%> }

	program fragment arb { <%
		useTemplate megagen/blends/addNormalsWithHeightmaps<>
	%> }
}

renderProgram megagen/blends/addNormalsWithHeightMapsAndParallelProjection {
	program vertex reference megagen/blends/addNormalsWithHeightmaps

	program fragment arb { <%
		$define uvTypeParallel
		useTemplate megagen/blends/addNormalsWithHeightmaps<>
	%> }
}

renderProgram megagen/blends/addNormalsWithHeightMapsAndParallelProjectionAndProjectionPattern {
	program vertex reference megagen/blends/addNormalsWithHeightmaps

	program fragment arb { <%
		$define uvTypeParallel
		$define projectionPattern
		useTemplate megagen/blends/addNormalsWithHeightmaps<>
	%> }
}

blend addNormalsWithHeightMaps {
	heightMap

	fragmentProgram {
		program megagen/blends/addNormalsWithHeightmaps
		parm 0		parm0 - 0.5 * parm1, parm0 + 0.5 * parm1, 1.0 / ( (parm0 + 0.5 * parm1) - (parm0 - 0.5 * parm1) ), 0
	}
}

blend addNormalsWithHeightMapsAndParallelProjection {
	heightMap

	fragmentProgram {
		program megagen/blends/addNormalsWithHeightMapsAndParallelProjection
		parm 0	parm0 - 0.5 * parm1, parm0 + 0.5 * parm1, 1.0 / ( (parm0 + 0.5 * parm1) - (parm0 - 0.5 * parm1) ), 0
	}
}

blend addNormalsWithHeightMapsAndParallelProjectionAndProjectionPattern {
	heightMap

	fragmentProgram {
		program megagen/blends/addNormalsWithHeightMapsAndParallelProjectionAndProjectionPatternBlend
		parm 0	parm0 - 0.5 * parm1, parm0 + 0.5 * parm1, 1.0 / ( (parm0 + 0.5 * parm1) - (parm0 - 0.5 * parm1) ), 0
		parm 1	0.5 - 0.5 * parm3, 1.0 / parm3, 0.5 + 0.5 * parm3, 0
	}
}

template megagen/blends/addHeightMaps {
	text { <%
		TEMP colorDest, colorSource, scalar;

		TEX colorSource, fragment.texcoord[0], texture[0], 2D;
		$ifdef uvTypeParallel
			TEX colorSource.rgb, fragment.texcoord[2], texture[3], 2D;
		$endif
		TEX colorDest, fragment.texcoord[1], texture[1], 2D;

		$ifdef projectionPattern
			PARAM	consts = { 3.14159265358979323846, 0, 0, 0 };	# pi

			TEMP colorProjectionPattern, _R0, _R1;
			TEX colorProjectionPattern, fragment.texcoord[2], texture[4], 2D;

			# modify alpha with pattern
			ADD _R0.a, colorProjectionPattern.x, -0.5;
			MUL _R1.a, colorSource.a, consts.x;
			SIN _R1.a, _R1.a;
			MUL _R0.a, _R1.a, _R0.a;
			ADD_SAT colorSource.a, colorSource.a, _R0.a;
			
			# Increase contrast
			ADD _R0.a, colorSource.a, -$blendParm_1.x;		# ramp start clamp
			MUL _R1.a, $blendParm_1.y, consts.x;
			MUL _R1.a, _R1.a, _R0.a;
			COS _R1.a, _R1.a;
			MAD _R1.a, _R1.a, -0.5, 0.5;
			CMP _R1.a, _R0.a, 0, _R1;
			ADD _R0.a, colorSource.a, -$blendParm_1.z;		# ramp end clamp
			CMP colorSource.a, _R0.a, _R1.a, 1;
		$endif

		MOV scalar.x, colorSource.a;
		ADD scalar.y, 1, -scalar.x;

		MUL colorSource, scalar.x, colorSource;
		MUL colorDest, scalar.y, colorDest;

		ADD scalar.z, colorDest.r, -colorSource.r;

		CMP result.color.rgb, scalar.z, colorSource, colorDest;
		MOV result.color.a, 1;
	%> }
}

renderProgram megagen/blends/addHeightMaps {
	program vertex arb { <%
		OPTION ARB_position_invariant;
		
		MOV result.texcoord[0], vertex.texcoord[0];
		MOV result.texcoord[1], vertex.texcoord[1];
		MOV result.texcoord[2], vertex.texcoord[2];
	%> }

	program fragment arb { <%
		useTemplate megagen/blends/addHeightMaps<>
	%> }
}

renderProgram megagen/blends/addHeightMapsWithParallelProjection {
	program vertex reference megagen/blends/addHeightMaps

	program fragment arb { <%
		$define uvTypeParallel
		useTemplate megagen/blends/addHeightMaps<>
	%> }
}

renderProgram megagen/blends/addHeightMapsWithParallelProjectionAndProjectionPattern {
	program vertex reference megagen/blends/addHeightMaps

	program fragment arb { <%
		$define uvTypeParallel
		$define projectionPattern
		useTemplate megagen/blends/addHeightMaps<>
	%> }
}

blend addHeightMaps {
	colorMod

	fragmentProgram {
		program megagen/blends/addHeightMaps
	}
}

blend addHeightMapsWithParallelProjection {
	colorMod

	fragmentProgram {
		program megagen/blends/addHeightMapsWithParallelProjection
	}
}

blend addHeightMapsWithParallelProjectionAndProjectionPattern {
	colorMod

	fragmentProgram {
		program megagen/blends/addHeightMapsWithParallelProjectionAndProjectionPattern
		parm 0	0, 0, 0, 0
		parm 1	0.5 - 0.5 * parm3, 1.0 / parm3, 0.5 + 0.5 * parm3, 0
	}
}

renderProgram megagen/blends/combineDetailTextureMaps {
	program vertex arb { <%
		OPTION ARB_position_invariant;

		MOV result.texcoord[0], vertex.texcoord[0];
	%> }

	program fragment arb { <%
		TEMP redMask, blueMask, greenMask, alphaMask, R0, R1;

		TEX redMask, fragment.texcoord[0], texture[0], 2D;
		TEX blueMask, fragment.texcoord[0], texture[1], 2D;
		TEX greenMask, fragment.texcoord[0], texture[2], 2D;
		TEX alphaMask, fragment.texcoord[0], texture[3], 2D;

		# Combine
		MOV R0.r, redMask.r;
		MOV R0.g, blueMask.r;
		MOV R0.b, greenMask.r;
		MOV R0.a, alphaMask.r;

		# Normalize
		DP4 R1, R0, R0;
		RSQ R1, R1.x;
		MUL result.color, R1.x, R0;
	%> }
}

blend combineDTM {
	colorMod

	fragmentProgram {
		program megagen/blends/combineDetailTextureMaps
	}
}