Add new tst: fp-generic/lrp_sat

Current r500 fragment program implementation fails this test.

tests/all.tests

@@ -69,6 +69,7 @@ fpgeneric = Group()
 def make_fpgeneric(name):
 	return PlainExecTest([testBinDir + 'fp-generic', testBinDir + '../tests/shaders/generic/' + name])
 fpgeneric['dph'] = make_fpgeneric('dph.fp')
+fpgeneric['lrp_sat'] = make_fpgeneric('lrp_sat.fp')
 shaders['fp-generic'] = fpgeneric
 
 bugs = Group()

tests/shaders/generic/lrp_sat.fp

+1 3 0
+tc
+ 0.5 0.0 1.0 0.0
+ 1.5 4.5 2.0 1.0
+-0.5 4.5 3.5 1.0
+tex
+expected
+ 0.25 0.5 0.5 1.0
+
+!!ARBfp1.0
+TEMP r0;
+LRP_SAT r0, fragment.texcoord[0], fragment.texcoord[1], fragment.texcoord[2];
+MUL result.color, 0.5, r0;
+END
+; comment