Path OCL initialization: handle case when lights vectors are empty

Author: howetuft

src/slg/engines/pathoclbase/pathoclbaseoclthreadinit.cpp

@@ -199,21 +199,40 @@ void PathOCLBaseOCLRenderThread::InitLights() {
 	} else
 		intersectionDevice->FreeBuffer(&envLightIndicesBuff);
 
-	intersectionDevice->AllocBufferRO(&lightIndexOffsetByMeshIndexBuff, &cscene->lightIndexOffsetByMeshIndex[0],
-		sizeof(u_int) * cscene->lightIndexOffsetByMeshIndex.size(), "Light offsets (Part I)");
-	intersectionDevice->AllocBufferRO(&lightIndexByTriIndexBuff, &cscene->lightIndexByTriIndex[0],
-		sizeof(u_int) * cscene->lightIndexByTriIndex.size(), "Light offsets (Part II)");
+	if (cscene->lightIndexOffsetByMeshIndex.size() > 0) {
+		intersectionDevice->AllocBufferRO(&lightIndexOffsetByMeshIndexBuff, &cscene->lightIndexOffsetByMeshIndex[0],
+			sizeof(u_int) * cscene->lightIndexOffsetByMeshIndex.size(), "Light offsets (Part I)");
+	} else {
+		intersectionDevice->FreeBuffer(&lightIndexOffsetByMeshIndexBuff);
+	}
+	if (cscene->lightIndexByTriIndex.size() > 0) {
+		intersectionDevice->AllocBufferRO(&lightIndexByTriIndexBuff, &cscene->lightIndexByTriIndex[0],
+			sizeof(u_int) * cscene->lightIndexByTriIndex.size(), "Light offsets (Part II)");
+	} else {
+		intersectionDevice->FreeBuffer(&lightIndexByTriIndexBuff);
+	}
+
 
 	if (cscene->envLightDistributions.size() > 0) {
 		intersectionDevice->AllocBufferRO(&envLightDistributionsBuff, &cscene->envLightDistributions[0],
 			sizeof(float) * cscene->envLightDistributions.size(), "Env. light distributions");
 	} else
 		intersectionDevice->FreeBuffer(&envLightDistributionsBuff);
 
-	intersectionDevice->AllocBufferRO(&lightsDistributionBuff, cscene->lightsDistribution,
-		cscene->lightsDistributionSize, "LightsDistribution");
-	intersectionDevice->AllocBufferRO(&infiniteLightSourcesDistributionBuff, cscene->infiniteLightSourcesDistribution,
-		cscene->infiniteLightSourcesDistributionSize, "InfiniteLightSourcesDistribution");
+	if (cscene->lightsDistributionSize > 0) {
+		intersectionDevice->AllocBufferRO(&lightsDistributionBuff, cscene->lightsDistribution,
+			cscene->lightsDistributionSize, "LightsDistribution");
+	} else {
+		intersectionDevice->FreeBuffer(&lightsDistributionBuff);
+	}
+
+	if (cscene->infiniteLightSourcesDistributionSize > 0) {
+		intersectionDevice->AllocBufferRO(&infiniteLightSourcesDistributionBuff, cscene->infiniteLightSourcesDistribution,
+			cscene->infiniteLightSourcesDistributionSize, "InfiniteLightSourcesDistribution");
+	} else {
+		intersectionDevice->FreeBuffer(&infiniteLightSourcesDistributionBuff);
+	}
+
 	if (cscene->dlscAllEntries.size() > 0) {
 		intersectionDevice->AllocBufferRO(&dlscAllEntriesBuff, &cscene->dlscAllEntries[0],
 			cscene->dlscAllEntries.size() * sizeof(slg::ocl::DLSCacheEntry), "DLSC all entries");