[#61] fixed handling of the case that only one queue for all usage exists (Intel Graphics)

projects/first_mesh/src/main.cpp

@@ -25,7 +25,7 @@ int main(int argc, const char** argv) {
 		window,
 		applicationName,
 		VK_MAKE_VERSION(0, 0, 1),
-		{ vk::QueueFlagBits::eGraphics },	//at this place I now must remove the other queues for the app to work but probably there is a better way to handle this
+		{ vk::QueueFlagBits::eGraphics ,vk::QueueFlagBits::eCompute , vk::QueueFlagBits::eTransfer },
 		{},
 		{ "VK_KHR_swapchain" }
 	);

src/vkcv/CommandResources.cpp

@@ -55,14 +55,8 @@ namespace vkcv {
 		else if (type == QueueType::Compute) {
 			return queueManager.getComputeQueues().front();
 		}
-		//example of how the non-existence of queues other than the graphics queue could be handled
 		else if (type == QueueType::Transfer) {
-			if (queueManager.getTransferQueues().size() == 0) {
-				return queueManager.getGraphicsQueues().front();
-			}
-			else {
-				return queueManager.getTransferQueues().front();
-			}
+			return queueManager.getTransferQueues().front();
 		}
 		else if (type == QueueType::Present) {
 			return queueManager.getPresentQueue();

src/vkcv/QueueManager.cpp

@@ -4,7 +4,6 @@
 
 #include "vkcv/QueueManager.hpp"
 
-#include "vkcv/QueueManager.hpp"
 
 namespace vkcv {
 
@@ -89,7 +88,12 @@ namespace vkcv {
                         }
                     }
                     if (!found) {
-                        throw std::runtime_error("Too many graphics queues were requested than being available!");
+                        for (int i = 0; i < queueFamilyStatus.size() && !found; i++) {
+                            if (initialQueueFamilyStatus[i][0] > 0) {
+                                queuePairsGraphics.push_back(std::pair(i, 0));
+                                found = true;
+                            }
+                        }
                     }
                     break;
                 case vk::QueueFlagBits::eCompute:
@@ -104,7 +108,12 @@ namespace vkcv {
                         }
                     }
                     if (!found) {
-                        throw std::runtime_error("Too many compute queues were requested than being available!");
+                        for (int i = 0; i < queueFamilyStatus.size() && !found; i++) {
+                            if (initialQueueFamilyStatus[i][1] > 0) {
+                                queuePairsCompute.push_back(std::pair(i, 0));
+                                found = true;
+                            }
+                        }
                     }
                     break;
                 case vk::QueueFlagBits::eTransfer:
@@ -119,7 +128,12 @@ namespace vkcv {
                         }
                     }
                     if (!found) {
-                        throw std::runtime_error("Too many transfer queues were requested than being available!");
+                        for (int i = 0; i < queueFamilyStatus.size() && !found; i++) {
+                            if (initialQueueFamilyStatus[i][2] > 0) {
+                                queuePairsTransfer.push_back(std::pair(i, 0));
+                                found = true;
+                            }
+                        }
                     }
                     break;
                 default: