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Vulkan backend: g_FrameIndex not used fix -> huge perf gain

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Added a macro to switch between unlimited frame rate (VK_PRESENT_MODE_IMMEDIATE_KHR) and limited to 60 fps (VK_PRESENT_MODE_FIFO_KHR). Only the latter mode is guaranteed to be available, but the former one most likely is.
This commit is contained in:
Peter Particle 2017-02-26 13:25:54 +01:00
parent 6384eee34f
commit fd90da38e1
1 changed files with 8 additions and 1 deletions
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9
examples/vulkan_example/main.cpp
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@ -12,6 +12,7 @@
#include "imgui_impl_glfw_vulkan.h"
#define IMGUI_MAX_POSSIBLE_BACK_BUFFERS 16
#define IMGUI_UNLIMITED_FRAME_RATE
static VkAllocationCallbacks* g_Allocator = NULL;
static VkInstance g_Instance = VK_NULL_HANDLE;
@ -83,7 +84,12 @@ static void resize_vulkan(GLFWwindow* /*window*/, int w, int h)
info.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
info.preTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
info.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
#ifdef IMGUI_UNLIMITED_FRAME_RATE
info.presentMode = VK_PRESENT_MODE_IMMEDIATE_KHR;
#elif
info.presentMode = VK_PRESENT_MODE_FIFO_KHR;
#endif
info.clipped = VK_TRUE;
info.oldSwapchain = old_swapchain;
VkSurfaceCapabilitiesKHR cap;
@ -93,6 +99,7 @@ static void resize_vulkan(GLFWwindow* /*window*/, int w, int h)
info.minImageCount = (cap.minImageCount + 2 < cap.maxImageCount) ? (cap.minImageCount + 2) : cap.maxImageCount;
else
info.minImageCount = cap.minImageCount + 2;
if (cap.currentExtent.width == 0xffffffff)
{
fb_width = w;
@ -462,7 +469,7 @@ static void frame_end()
check_vk_result(err);
check_vk_result(res);
}
g_FrameIndex = (g_FrameIndex) % IMGUI_VK_QUEUED_FRAMES;
g_FrameIndex = (g_FrameIndex+1) % IMGUI_VK_QUEUED_FRAMES;
}
static void error_callback(int error, const char* description)