WIP docs: commenting in physics.c/physics.h and README updates

README.md

@@ -8,6 +8,7 @@
 It consists of several components:
 
 - `src/main.c`, Main script. Takes all other src and actually renders the engine.
+- `src/physics.c`, All the science & math crap. Ugh.
 
 - More stuff in src. README in progress.
 

src/docprogress.txt

@@ -0,0 +1,10 @@
+main.c - Done
+physics.c - Done, refine later
+    physics.h
+renderer.c
+    renderer.h
+player.c
+    player.h
+world.c
+    world.h
+config.h

src/physics.c

@@ -1,20 +1,26 @@
 #include <math.h>
-
+// better hope you were paying attention in physics class for this one
 #include "physics.h"
 #include "world.h"
 #include "config.h"
 
+// Main physics update loop for all entities
 void UpdateEntities(float dt, int screenWidth)
 {
+    // Iterate through all possible entities
     for (int i = 0; i < MAX_ENTITIES; i++)
     {
         Entity *e = &entities[i];
 
+        // Skip inactive entities
         if (!e->active)
             continue;
 
+        // Check if entity is currently touching the ground
+        // YOU'RE GROUNDED!!! lol
         bool onGround = IsGrounded(e);
 
+        // Apply gravity force if enabled for this entity
         if (e->affectedByGravity)
         {
             ApplyForce(
@@ -23,21 +29,25 @@ void UpdateEntities(float dt, int screenWidth)
             );
         }
 
+        // Compute acceleration from accumulated forces (F = ma)
         e->acceleration.x =
         e->force.x / e->mass;
 
         e->acceleration.y =
         e->force.y / e->mass;
 
+        // Integrate velocity from acceleration
         e->velocity.x +=
         e->acceleration.x * dt;
 
         e->velocity.y +=
         e->acceleration.y * dt;
 
+        // Apply air drag to slow movement over time
         e->velocity.x *= AIR_DRAG;
         e->velocity.y *= AIR_DRAG;
 
+        // Apply ground friction when on the ground
         if (onGround)
         {
             if (e->velocity.x > 0)
@@ -58,6 +68,7 @@ void UpdateEntities(float dt, int screenWidth)
             }
         }
 
+        // Clamp player horizontal speed
         if (e->isPlayer)
         {
             if (e->velocity.x > MAX_PLAYER_SPEED)
@@ -67,14 +78,17 @@ void UpdateEntities(float dt, int screenWidth)
                 e->velocity.x = -MAX_PLAYER_SPEED;
         }
 
+        // Integrate position from velocity
         e->position.x +=
         e->velocity.x * dt;
 
         e->position.y +=
         e->velocity.y * dt;
 
+        // Reset forces after integration step
         e->force = (Vector2){0, 0};
 
+        // Ground collision
         if (e->position.y +
             e->size * 0.5f >=
             ground_y)
@@ -86,12 +100,14 @@ void UpdateEntities(float dt, int screenWidth)
             e->velocity.y *=
             -BOUNCE;
 
+            // Stop tiny bounces... or at least, attempt to.
             if (fabsf(e->velocity.y) < 15.0f)
             {
                 e->velocity.y = 0;
             }
         }
 
+        // Left wall collision
         if (e->position.x -
             e->size * 0.5f < 0)
         {
@@ -101,6 +117,7 @@ void UpdateEntities(float dt, int screenWidth)
             e->velocity.x *= -0.6f;
         }
 
+        // Right wall collision
         if (e->position.x +
             e->size * 0.5f >
             screenWidth)

src/physics.h

@@ -1,6 +1,9 @@
 #ifndef PHYSICS_H
 #define PHYSICS_H
 
+// FUNction declaration! yay!!!
+// used by main script to update entities as time goes on
+// i don't think it's used anywhere else, but double check me
 void UpdateEntities(float dt, int screenWidth);
 
 #endif