More animation stuff

2 files changed, 34 insertions, 0 deletions

diff --git a/src/animation.c b/src/animation.c
index f173401..2fc20fb 100644
--- a/src/animation.c
+++ b/src/animation.c
@@ -23,3 +23,32 @@ void freeAnimation(Animation* animation)
     UnloadImage(animation->image);
     UnloadTexture(animation->texture);
 }
+
+void setAnimationFrame(Animation * animation, int frame)
+{
+    animation->currentFrame = frame;
+    unsigned int nextFrameDataOffset = animation->image.width * animation->image.height * 4 * frame;
+
+    UpdateTexture(animation->texture, ((unsigned int*)animation->image.data) + nextFrameDataOffset);
+}
+
+void runAnimation(Animation * animation)
+{
+    double currentTime = GetTime();
+
+    if (animation->lastTime == -1 || currentTime - animation->lastTime >= animation->delay)
+    {
+        // Count the frames up.
+        int newFrame = animation->currentFrame + 1;
+
+        if (newFrame >= animation->frameCount)
+        {
+            newFrame = 0;
+        }
+
+        // Set the frame
+        setAnimationFrame(animation, newFrame);
+
+        animation->lastTime =  currentTime;
+    }
+}
diff --git a/src/animation.h b/src/animation.h
index 8ec918f..089e6e1 100644
--- a/src/animation.h
+++ b/src/animation.h
@@ -22,4 +22,9 @@ typedef struct Animation {
 Animation loadAnimationFromFile(const char* fileName);
 void freeAnimation(Animation* animation);
 
+// Set the frame and update the texture.
+void setAnimationFrame(Animation * animation, int frame);
+
+void runAnimation(Animation * animation);
+
 #endif