core. include check in ocl.c regarding lookup-gap for kernel 'bufius'

doc: change documentation

AUTHORS.md

@@ -27,6 +27,7 @@ updated by many others.
 * ckolivas: Con Kolivas <kernel @at@ kolivas }dot{ org> 15qSxP1SQcUX3o4nhkfdbgyoWEFMomJ4rZ
 * psw: Pavel Semjanov LP6GRFvgoMxKA6AW4TVF668cNezEGZvEtr
 * zuikkis: Zuikkis LeXck7EYgxyjw13zNDxZFmmgmWffFvhmSh
+* bufius: Bufius VvvmmkYHKGtdr97JLyyZuJ3Th5ayungnjk
 
 
 ## Testing, bug fixes, improvements

doc/kernel.md

@@ -58,6 +58,15 @@ Only supports `vectors=1` and `lookup-gap=2`.
 [Announcement](https://litecointalk.org/index.php?topic=6058.msg90873#msg90873).
 
 
+### bufius
+
+Bufius' optimised kernel, based on `ckolivas`.
+
+Only supports `vectors=1` and `lookup-gap 2, 4 or 8`.
+
+Takeover from vertminer
+
+
 ## Submitting new kernels
 
 ### Requirements

ocl.c

@@ -456,6 +456,11 @@ _clState *initCl(unsigned int gpu, char *name, size_t nameSize, algorithm_t *alg
 		applog(LOG_WARNING, "Kernel zuikkis only supports lookup-gap = 2 (currently %d), forcing.", cgpu->lookup_gap);
 		cgpu->lookup_gap = 2;
 	}
+	
+	if ((strcmp(cgpu->kernelname, "bufius") == 0) && ((cgpu->lookup_gap != 2) && (cgpu->lookup_gap != 4) && (cgpu->lookup_gap != 8))) {
+		applog(LOG_WARNING, "Kernel bufius only supports lookup-gap of 2, 4 or 8 (currently %d), forcing to 2", cgpu->lookup_gap);
+		cgpu->lookup_gap = 2;
+	}	
 
 	if (!cgpu->opt_tc) {
 		unsigned int sixtyfours;