From 3f6c99cf21c75ee1be1db9a9897e94613a86e625 Mon Sep 17 00:00:00 2001
From: Luca Conte <main@lugico.de>
Date: Thu, 25 Apr 2024 16:52:19 +0200
Subject: [PATCH] frame rate counter

---
 u06-2/main.c         | 27 ++++++++++++++++++++++++++-
 u06-2/wavefrontobj.c |  2 +-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/u06-2/main.c b/u06-2/main.c
index 3100b00..f0289b6 100644
--- a/u06-2/main.c
+++ b/u06-2/main.c
@@ -28,6 +28,11 @@ GLFWwindow* window;
 
 GLfloat aspectRatio = 1.0f;
 
+double timeBetweenUpdates = 0.2f;
+
+double timeSinceUpdate = 0.0f;
+int framesSinceUpdate = 0;
+
 GLfloat step = 0.0f;
 const GLfloat pi = 3.14159f;
 
@@ -179,8 +184,25 @@ void init(void) {
 	glClearColor(0.1f, 0.1f, 0.3f, 1.0f);
 }
 
+void updateStats() {
+	printf("\rFPS: %.1f", framesSinceUpdate / timeSinceUpdate);
+	fflush(stdout);
+}
+
 void draw(void) {
 
+	// FPS Counter
+	framesSinceUpdate++;
+	double deltaTime = glfwGetTime();
+	timeSinceUpdate += deltaTime;
+	glfwSetTime(0.0f);
+
+	if (timeSinceUpdate >= timeBetweenUpdates) {
+		updateStats();
+		timeSinceUpdate = 0.0f;
+		framesSinceUpdate = 0;
+	}
+
 	// camera movement
 	handleInputs();
 
@@ -190,7 +212,7 @@ void draw(void) {
 
 	// step for rotations
 	// counts up to 1.0 and then resets back to 0.0 forever
-	step += 0.002f;
+	step += deltaTime / 5;
 	if (step > 1.0f) step -= 1.0f;
 
 	// step multiplied by pi * 2 for use in rotation and trig functions
@@ -272,6 +294,9 @@ int main(void) {
 	glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
 	glfwMakeContextCurrent(window);
 
+	// disable framerate cap
+	glfwSwapInterval(0);
+
 	// register keyboard event handler
 	glfwSetKeyCallback(window, keyboardHandler);
 
diff --git a/u06-2/wavefrontobj.c b/u06-2/wavefrontobj.c
index 256451b..ef2b74b 100644
--- a/u06-2/wavefrontobj.c
+++ b/u06-2/wavefrontobj.c
@@ -53,7 +53,7 @@ ParsedObjFile readObjFile(char* path) {
 		}
 	}
 
-	printf("Vertices: %d\nFaces: %d\nNormals:%d\nTextures:%d\n", numVertices, numFaces, numVertexNormals, numTextureCoords);
+	// printf("Vertices: %d\nFaces: %d\nNormals:%d\nTextures:%d\n", numVertices, numFaces, numVertexNormals, numTextureCoords);
 
 	vec3* vertices = (vec3*) malloc(sizeof(vec3) * numVertices);
 	vec3* normals = (vec3*) malloc(sizeof(vec3) * numVertexNormals);