From 76f2069b78fe369a3eba03a16218d352e3e51b53 Mon Sep 17 00:00:00 2001
From: Jonathan Bradley <jcb@pikum.xyz>
Date: Mon, 16 Oct 2023 09:27:33 -0400
Subject: checkpoint - get current monitor's refresh rate

---
 src/main.cpp   |  4 ++++
 src/window.cpp | 21 +++++++++++++++++++++
 src/window.hpp |  2 ++
 3 files changed, 27 insertions(+)

(limited to 'src')

diff --git a/src/main.cpp b/src/main.cpp
index ec0bf71..bd9dee0 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -53,6 +53,10 @@ int main() {
 				std::this_thread::sleep_until(lastTimePoint + GameTimeDuration(nsAhead + 1));
 				nsAhead = 0;
 			}
+			if (vidMode.refreshRate != pkeSettings.targetFPS) {
+				pkeSettings.targetFPS = vidMode.refreshRate;
+				pkeSettings.deltaPerFrame = 1 / double(pkeSettings.targetFPS);
+			}
 
 			GameTimePoint currentTimePoint = pkeSettings.steadyClock.now();
 			double deltaThisTick = (currentTimePoint - lastTimePoint).count() / NANO_DENOM_DOUBLE;
diff --git a/src/window.cpp b/src/window.cpp
index c7b9dba..2a1b905 100644
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -27,6 +27,8 @@ const bool VULKAN_DEBUG_REPORT = true;
  * Initialization
  */
 GLFWwindow *window = nullptr;
+GLFWmonitor *monitor = nullptr;
+GLFWvidmode vidMode;
 VkInstance vkInstance = nullptr;
 VkPhysicalDevice vkPhysicalDevice = nullptr;
 VkPhysicalDeviceProperties vkPhysicalDeviceProperties;
@@ -2323,6 +2325,22 @@ void DestroySwapchain() {
 	vkDestroySwapchainKHR(vkDevice, vkSwapchainKHR, vkAllocator);
 }
 
+void DetermineMonitor() {
+	int monitorCount;
+	GLFWmonitor **monitors = glfwGetMonitors(&monitorCount);
+	assert(monitors != nullptr);
+	// TODO - actually determine monitor
+	monitor = monitors[0];
+
+	const auto *videoMode = glfwGetVideoMode(monitor);
+	vidMode.width = videoMode->width;
+	vidMode.height = videoMode->height;
+	vidMode.redBits = videoMode->redBits;
+	vidMode.greenBits = videoMode->greenBits;
+	vidMode.blueBits = videoMode->blueBits;
+	vidMode.refreshRate = videoMode->refreshRate;
+}
+
 void RecreateSwapchain() {
 	int width, height = 0;
 	glfwGetFramebufferSize(window, &width, &height);
@@ -2332,6 +2350,7 @@ void RecreateSwapchain() {
 	}
 	extent.width = width;
 	extent.height = height;
+	DetermineMonitor();
 	vkDeviceWaitIdle(vkDevice);
 	DestroySwapchain();
 	CreateSwapchain();
@@ -2368,6 +2387,8 @@ void CreateWindow(PKEWindowProperties *wp) {
 	CreateGraphicsPipelines();
 	UpdateDebugGraphicsPipeline();
 	CreateImGui();
+
+	DetermineMonitor();
 }
 
 void DestroyWindow() {
diff --git a/src/window.hpp b/src/window.hpp
index 91f9929..ab07a8b 100644
--- a/src/window.hpp
+++ b/src/window.hpp
@@ -21,6 +21,8 @@
 const unsigned int MAX_FRAMES_IN_FLIGHT = 3;
 
 extern GLFWwindow *window;
+extern GLFWmonitor *monitor;
+extern GLFWvidmode vidMode;
 extern VkInstance vkInstance;
 extern VkPhysicalDevice vkPhysicalDevice;
 extern VkPhysicalDeviceProperties vkPhysicalDeviceProperties;
-- 
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