Allow Command Buffers to be allocated and freed

Added functionality so that the CommandPool can allocate and
free command buffer objects.

Bug b/119827933

Change-Id: I190ba3cd7738f2b5e37b196a0abba6d07cfae173
Reviewed-on: https://swiftshader-review.googlesource.com/c/22748
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

src/Vulkan/VkCommandPool.cpp

diff --git a/src/Vulkan/VkCommandPool.cpp b/src/Vulkan/VkCommandPool.cpp
index 155dfeb..821d4fb 100644
--- a/src/Vulkan/VkCommandPool.cpp
+++ b/src/Vulkan/VkCommandPool.cpp
@@ -13,16 +13,28 @@
 // limitations under the License.
 
 #include "VkCommandPool.hpp"
+#include "VkDestroy.h"
+#include <algorithm>
 
 namespace vk
 {
 
 CommandPool::CommandPool(const VkCommandPoolCreateInfo* pCreateInfo, void* mem)
 {
+	// FIXME (b/119409619): use an allocator here so we can control all memory allocations
+	commandBuffers = new std::set<VkCommandBuffer>();
 }
 
 void CommandPool::destroy(const VkAllocationCallbacks* pAllocator)
 {
+	// Free command Buffers allocated in allocateCommandBuffers
+	for(auto commandBuffer : *commandBuffers)
+	{
+		vk::destroy(commandBuffer, DEVICE_MEMORY);
+	}
+
+	// FIXME (b/119409619): use an allocator here so we can control all memory allocations
+	delete commandBuffers;
 }
 
 size_t CommandPool::ComputeRequiredAllocationSize(const VkCommandPoolCreateInfo* pCreateInfo)
@@ -30,4 +42,41 @@
 	return 0;
 }
 
+VkResult CommandPool::allocateCommandBuffers(VkCommandBufferLevel level, uint32_t commandBufferCount, VkCommandBuffer* pCommandBuffers)
+{
+	for(uint32_t i = 0; i < commandBufferCount; i++)
+	{
+		DispatchableCommandBuffer* commandBuffer = new (DEVICE_MEMORY) DispatchableCommandBuffer(level);
+		if(commandBuffer)
+		{
+			pCommandBuffers[i] = *commandBuffer;
+		}
+		else
+		{
+			for(uint32_t j = 0; j < i; j++)
+			{
+				vk::destroy(pCommandBuffers[j], DEVICE_MEMORY);
+			}
+			for(uint32_t j = 0; j < commandBufferCount; j++)
+			{
+				pCommandBuffers[j] = VK_NULL_HANDLE;
+			}
+			return VK_ERROR_OUT_OF_DEVICE_MEMORY;
+		}
+	}
+
+	commandBuffers->insert(pCommandBuffers, pCommandBuffers + commandBufferCount);
+
+	return VK_SUCCESS;
+}
+
+void CommandPool::freeCommandBuffers(uint32_t commandBufferCount, const VkCommandBuffer* pCommandBuffers)
+{
+	for(uint32_t i = 0; i < commandBufferCount; ++i)
+	{
+		commandBuffers->erase(pCommandBuffers[i]);
+		vk::destroy(pCommandBuffers[i], DEVICE_MEMORY);
+	}
+}
+
 } // namespace vk

src/Vulkan/VkCommandPool.hpp

diff --git a/src/Vulkan/VkCommandPool.hpp b/src/Vulkan/VkCommandPool.hpp
index 46b1426..05135c1 100644
--- a/src/Vulkan/VkCommandPool.hpp
+++ b/src/Vulkan/VkCommandPool.hpp
@@ -16,6 +16,7 @@
 #define VK_COMMAND_POOL_HPP_
 
 #include "VkObject.hpp"
+#include <set>
 
 namespace vk
 {
@@ -29,7 +30,11 @@
 
 	static size_t ComputeRequiredAllocationSize(const VkCommandPoolCreateInfo* pCreateInfo);
 
+	VkResult allocateCommandBuffers(VkCommandBufferLevel level, uint32_t commandBufferCount, VkCommandBuffer* pCommandBuffers);
+	void freeCommandBuffers(uint32_t commandBufferCount, const VkCommandBuffer* pCommandBuffers);
+
 private:
+	std::set<VkCommandBuffer>* commandBuffers;
 };
 
 static inline CommandPool* Cast(VkCommandPool object)

src/Vulkan/libVulkan.cpp

diff --git a/src/Vulkan/libVulkan.cpp b/src/Vulkan/libVulkan.cpp
index 0d8ca14..2b8f84c 100644
--- a/src/Vulkan/libVulkan.cpp
+++ b/src/Vulkan/libVulkan.cpp
@@ -1116,9 +1116,13 @@
 	TRACE("(VkDevice device = 0x%X, const VkCommandBufferAllocateInfo* pAllocateInfo = 0x%X, VkCommandBuffer* pCommandBuffers = 0x%X)",
 		    device, pAllocateInfo, pCommandBuffers);
 
-	UNIMPLEMENTED();
+	if(pAllocateInfo->pNext)
+	{
+		UNIMPLEMENTED();
+	}
 
-	return VK_SUCCESS;
+	return vk::Cast(pAllocateInfo->commandPool)->allocateCommandBuffers(
+		pAllocateInfo->level, pAllocateInfo->commandBufferCount, pCommandBuffers);
 }
 
 VKAPI_ATTR void VKAPI_CALL vkFreeCommandBuffers(VkDevice device, VkCommandPool commandPool, uint32_t commandBufferCount, const VkCommandBuffer* pCommandBuffers)
@@ -1126,7 +1130,7 @@
 	TRACE("(VkDevice device = 0x%X, VkCommandPool commandPool = 0x%X, uint32_t commandBufferCount = %d, const VkCommandBuffer* pCommandBuffers = 0x%X)",
 		    device, commandPool, commandBufferCount, pCommandBuffers);
 
-	UNIMPLEMENTED();
+	vk::Cast(commandPool)->freeCommandBuffers(commandBufferCount, pCommandBuffers);
 }
 
 VKAPI_ATTR VkResult VKAPI_CALL vkBeginCommandBuffer(VkCommandBuffer commandBuffer, const VkCommandBufferBeginInfo* pBeginInfo)