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Vulkan: fix a nasty race.

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We could garbage-collect fences before/during their wait.
This commit is contained in:
Pierre-Loup A. Griffais 2020-01-27 22:46:38 -08:00
parent 578849e429
commit 1bcd0bd930
1 changed files with 16 additions and 6 deletions
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22
src/rendervulkan.cpp
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@ -83,6 +83,7 @@ struct scratchCmdBuffer_t
std::vector<CVulkanTexture *> refs;
std::atomic<bool> haswaiter;
std::atomic<bool> busy;
};
@ -1082,14 +1083,17 @@ int vulkan_init(void)
return 1;
}
static inline uint32_t get_command_buffer( VkCommandBuffer &cmdBuf, VkFence &fence )
static inline uint32_t get_command_buffer( VkCommandBuffer &cmdBuf, VkFence *pFence )
{
for ( uint32_t i = 0; i < k_nScratchCmdBufferCount; i++ )
{
if ( g_scratchCommandBuffers[ i ].busy == false )
{
cmdBuf = g_scratchCommandBuffers[ i ].cmdBuf;
fence = g_scratchCommandBuffers[ i ].fence;
if ( pFence != nullptr )
{
*pFence = g_scratchCommandBuffers[ i ].fence;
}
VkCommandBufferBeginInfo commandBufferBeginInfo = {
.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO,
@ -1105,6 +1109,8 @@ static inline uint32_t get_command_buffer( VkCommandBuffer &cmdBuf, VkFence &fen
g_scratchCommandBuffers[ i ].refs.clear();
g_scratchCommandBuffers[ i ].haswaiter = pFence != nullptr;
g_scratchCommandBuffers[ i ].busy = true;
return i;
@ -1153,7 +1159,8 @@ void vulkan_garbage_collect( void )
// Probably just differentiate "busy" and "submitted"
for ( uint32_t i = 0; i < k_nScratchCmdBufferCount; i++ )
{
if ( g_scratchCommandBuffers[ i ].busy == true )
if ( g_scratchCommandBuffers[ i ].busy == true &&
g_scratchCommandBuffers[ i ].haswaiter == false )
{
VkResult res = vkGetFenceStatus( device, g_scratchCommandBuffers[ i ].fence );
@ -1215,8 +1222,7 @@ VulkanTexture_t vulkan_create_texture_from_bits( uint32_t width, uint32_t height
memcpy( pUploadBuffer, bits, width * height * 4 );
VkCommandBuffer commandBuffer;
VkFence fence;
uint32_t handle = get_command_buffer( commandBuffer, fence );
uint32_t handle = get_command_buffer( commandBuffer, nullptr );
VkBufferImageCopy region = {};
@ -1612,7 +1618,7 @@ uint32_t vulkan_get_texture_fence( VulkanTexture_t vulkanTex )
VkCommandBuffer commandBuffer;
VkFence fence;
uint32_t handle = get_command_buffer( commandBuffer, fence );
uint32_t handle = get_command_buffer( commandBuffer, &fence );
VkBufferImageCopy region = {};
@ -1639,7 +1645,11 @@ uint32_t vulkan_get_texture_fence( VulkanTexture_t vulkanTex )
void vulkan_wait_for_fence( uint32_t handle )
{
assert( g_scratchCommandBuffers[ handle ].busy == true &&
g_scratchCommandBuffers[ handle ].haswaiter == true );
vkWaitForFences( device, 1, &g_scratchCommandBuffers[ handle ].fence, VK_TRUE, ~0 );
g_scratchCommandBuffers[ handle ].haswaiter = false;
}