As far as I can tell, the code should work, but Scarfy stays at frame 0 instead of cycling through his run animation. I could use another set of eyes if someone feels like checking over my code? I know I missed something. I’m just not sure what 
Thanks in advance!
Code below, or if you prefer GitHub:
https://github.com/ScaerieTale/Dapper-Dasher/dasher.cpp
#include "raylib.h"
int main()
{
// Initial window setup
const int window_width{512};
const int window_height{380};
InitWindow(window_width, window_height, "Dapper Dasher");
SetTargetFPS(60);
// Acceleration (pixels/sec)/sec
const int gravity{1000};
// jump velocity in pixles/second
const int jumpVel{600};
bool isInAir{false};
// Velocity is 0 when not jumping
int velocity{0};
// Character
Texture2D scarfy = LoadTexture("textures/scarfy.png");
Rectangle scarfyRec;
scarfyRec.height = scarfy.height;
scarfyRec.width = scarfy.width/6;
scarfyRec.x = 0;
scarfyRec.y = 0;
Vector2 scarfyPos;
scarfyPos.x = window_width/2 - scarfyRec.width/2;
scarfyPos.y = window_height - scarfyRec.height;
// Animation frame
int frame{};
// Initiate game loop
while(!WindowShouldClose())
{
// In-game window setup
BeginDrawing();
ClearBackground(WHITE);
// Game logic begin
// Update animation frame
scarfyRec.x = frame * scarfy.width;
frame++;
if (frame > 5)
{
frame = 0;
}
DrawTextureRec(scarfy, scarfyRec, scarfyPos, WHITE);
// Physics
// Delta Time
const float dT{GetFrameTime()};
// Check for ground
if (scarfyPos.y >= window_height - scarfy.height)
{
// On the ground
velocity = 0;
isInAir = false;
}
else
{
// In mid-air, apply gravity
velocity -= gravity * dT;
}
// Spacebar to jump!
if (IsKeyPressed(KEY_SPACE) && !isInAir)
{
velocity += jumpVel;
isInAir = true;
}
// Update position
scarfyPos.y -= velocity * dT;
// Game logic end
EndDrawing();
};
UnloadTexture(scarfy);
CloseWindow();
}