move gameloop poc to mwe

1 files changed, 68 insertions, 0 deletions

diff --git a/mwe/gameloop/src/timer.cpp b/mwe/gameloop/src/timer.cpp
new file mode 100644
index 0000000..1e3045f
--- /dev/null
+++ b/mwe/gameloop/src/timer.cpp
@@ -0,0 +1,68 @@
+#include "timer.h"
+
+// Constructor (private)
+LoopTimer::LoopTimer(){}
+
+// Get the singleton instance of the timer
+LoopTimer& LoopTimer::getInstance() {
+    static LoopTimer instance;
+    return instance;
+}
+
+// Start the timer (initialize frame time)
+void LoopTimer::start() {
+    lastFrameTime = SDL_GetTicks64();
+    elapsedTime = 0;
+    elapsedFixedTime = 0;
+    deltaTime = 0;
+}
+
+// Update the timer, calculate deltaTime
+void LoopTimer::update() {
+    uint64_t currentFrameTime = SDL_GetTicks64();
+    deltaTime = (currentFrameTime - lastFrameTime) / 1000.0;  // Convert to seconds
+
+    if (deltaTime > maximumDeltaTime) {
+        deltaTime = maximumDeltaTime;
+    }
+
+    elapsedTime += deltaTime;
+    lastFrameTime = currentFrameTime;
+}
+
+double LoopTimer::getDeltaTime() const {
+    return deltaTime;
+}
+int LoopTimer::getCurrentTime() const {
+    return SDL_GetTicks();
+}
+
+void LoopTimer::advanceFixedUpdate() {
+    elapsedFixedTime += fixedDeltaTime;
+}
+
+double LoopTimer::getFixedDeltaTime() const {
+    return fixedDeltaTime;
+}
+
+void LoopTimer::setFPS(int FPS) {
+    this->FPS = FPS;
+    frameTargetTime = 1.0 / FPS;
+}
+
+int LoopTimer::getFPS() const {
+    return FPS;
+}
+
+void LoopTimer::enforceFrameRate() {
+    uint64_t currentFrameTime = SDL_GetTicks64();
+    double frameDuration = (currentFrameTime - lastFrameTime) / 1000.0;
+
+    if (frameDuration < frameTargetTime) {
+        uint32_t delayTime = (uint32_t)((frameTargetTime - frameDuration) * 1000.0);
+        SDL_Delay(delayTime);
+    }
+}
+double LoopTimer::getLag() const {
+    return elapsedTime - elapsedFixedTime;
+}