renderProgram shadow {

	coverageVersion shadow_coverage
	
	program vertex arb { <%
		TEMP R0;
		TEMP R1;
		TEMP R2;
		SLT R2.x, 0, $positionAttrib.w;

		TEMP FARPOS;		
		SUB	FARPOS.xyz, $positionAttrib, $lightOrigin;
		MOV FARPOS.w, 0;
		PARAM  mvp[4]       = { state.matrix.mvp };
		DP4 R0.x, FARPOS, mvp[0];
		DP4 R0.y, FARPOS, mvp[1];
		DP4 R0.z, FARPOS, mvp[2];
		DP4 R0.w, FARPOS, mvp[3];
		DP4 R1.x, mvp[0], $positionAttrib;
		DP4 R1.y, mvp[1], $positionAttrib;
		DP4 R1.z, mvp[2], $positionAttrib;
		DP4 R1.w, mvp[3], $positionAttrib;
		SGE R2.x, 0, R2;
		SUB R0, R0, R1;
		MAD result.position, R0, R2.x, R1;

		#if r_showShadows
		MOV result.color, vertex.color;
		#endif
	%> }
	/*program vertex arb { <%
		TEMP R0;

		# RO = OPOS - light, assumes light.w = 0
		SUB	R0, $positionAttrib, $lightOrigin;

		# RO -= OPOS.w * light
		MAD	R0, R0.wwww, $lightOrigin, R0;

		# normal transform
		DP4	result.position.x, R0, state.matrix.mvp.row[0];
		DP4	result.position.y, R0, state.matrix.mvp.row[1];
		DP4	result.position.z, R0, state.matrix.mvp.row[2];
		DP4	result.position.w, R0, state.matrix.mvp.row[3];

		#if r_showShadows
		MOV result.color, vertex.color;
		#endif
	%> }*/

	program fragment arb { <%
		OPTION ARB_precision_hint_fastest;

		#if r_showShadows
		MOV result.color, fragment.color;
		#endif
	%> }
}

renderProgram shadow_invariant {

	program vertex arb { <%
		OPTION ARB_position_invariant;

		#if r_showShadows
		MOV result.color, vertex.color;
		#endif
	%> }

	program fragment reference shadow
}

renderProgram shadow_coverage {

	program vertex reference shadow
	
	program fragment arb { <%
		OPTION ARB_precision_hint_fastest;

		# coverage dither mask
		TEMP _R1, _R0;
		MUL		_R1.xy, fragment.position, 0.015625;
		TEX		_R0.r, _R1, $dithermask, 2D;
		SUB		_R0.a, 0.5, _R0.r;
		KIL		_R0.a;

		#if r_showShadows
		MOV result.color, fragment.color;
		#endif
	%> }
}

renderProgram shadowParallel {
	coverageVersion shadowParallel_coverage
	program vertex arb { <%
		TEMP R0, R1;

		ADD R1, -$positionAttrib.wwww, 1;
		MUL R0, $positionAttrib.w, $positionAttrib;
		MAD R0.xyz, R1, $lightDirection, R0;

		# normal transform
		DP4	result.position.x, R0, state.matrix.mvp.row[0];
		DP4	result.position.y, R0, state.matrix.mvp.row[1];
		DP4	result.position.z, R0, state.matrix.mvp.row[2];
		DP4	result.position.w, R0, state.matrix.mvp.row[3];

		#if r_showShadows
		MOV result.color, vertex.color;
		#endif
	%> }

	program fragment reference shadow
}

renderProgram shadowParallel_coverage {
	program vertex reference shadowParallel
	program fragment reference shadow_coverage
}

renderProgram shadowParallelNotInfinite {
	program vertex arb { <%
		TEMP R0, R1;

		ADD R1, -$positionAttrib.wwww, 1;
		MUL R1, R1, $lightDirection.w;
		MAD R0.xyz, R1, $lightDirection, $positionAttrib;
		MOV R0.w, 1;

		# normal transform
		DP4	result.position.x, R0, state.matrix.mvp.row[0];
		DP4	result.position.y, R0, state.matrix.mvp.row[1];
		DP4	result.position.z, R0, state.matrix.mvp.row[2];
		DP4	result.position.w, R0, state.matrix.mvp.row[3];

		#if r_showShadows
		MOV result.color, vertex.color;
		#endif
	%> }

	program fragment reference shadow
}

renderProgram shadowParallelProject {
	program vertex arb { <%
		TEMP R0, R1;

		ADD R1, -$positionAttrib.wwww, 1;
		TEMP LIGHTDIR;		
		SUB	LIGHTDIR.xyz, $positionAttrib, $lightOrigin;
		DP3  LIGHTDIR.w, LIGHTDIR, LIGHTDIR;
		RSQ	LIGHTDIR.w, LIGHTDIR.w;
		MUL LIGHTDIR.xyz, LIGHTDIR, LIGHTDIR.w;
		
		MUL R1, R1, $lightDirection.w;
		MAD R0.xyz, R1, LIGHTDIR, $positionAttrib;
		MOV R0.w, 1;

		# normal transform
		DP4	result.position.x, R0, state.matrix.mvp.row[0];
		DP4	result.position.y, R0, state.matrix.mvp.row[1];
		DP4	result.position.z, R0, state.matrix.mvp.row[2];
		DP4	result.position.w, R0, state.matrix.mvp.row[3];

		#if r_showShadows
		MOV result.color, vertex.color;
		#endif
	%> }

	program fragment reference shadow
}