Constant Delta Time set to 60 FPS

src/base/base_math.h

@@ -1,7 +1,7 @@
 #ifndef BASE_MATH_H
 #define BASE_MATH_H
 
-typedef struct Vec2F32 Vec2F32;
+typedef union Vec2F32 Vec2F32;
 union Vec2F32 {
   struct {
     f32 x;
@@ -10,14 +10,14 @@ union Vec2F32 {
   f32 v[2];
 };
 
-typedef struct Vec3F32 Vec3F32;
+typedef union Vec3F32 Vec3F32;
 union Vec3F32 {
   struct {
     f32 x;
     f32 y;
     f32 z;
   };
-  f32 v[2];
+  f32 v[3];
 };
 
 Vec3F32 vec3f32_rotate_x(Vec3F32 vector, float angle);

src/ragar/ragar_main.c

@@ -15,7 +15,8 @@ Vec2F32 g_projected_points[POINTS];
 Vec3F32 camera_position = {.x = 0, .y = 0, .z = -5};
 Vec3F32 cube_rotation = {.x = 0, .y = 0, .z = 0};
 
-int is_running;
+s32 is_running;
+s32 previous_frame_time = 0;
 
 // Perspective Projection (perspective divide)
 // Formula
@@ -69,6 +70,13 @@ void process_input(void) {
 }
 
 void update(void) {
+  //  while(!SDL_TICKS_PASSED(SDL_GetTicks(), previous_frame_time + FRAME_TARGET_TIME)); // NOTE(tijani): SLOWWWW!!!!
+  s32 time_to_wait = FRAME_TARGET_TIME - (SDL_GetTicks() - previous_frame_time);
+  if (time_to_wait > 0 && time_to_wait <= FRAME_TARGET_TIME) {
+    SDL_Delay(time_to_wait);
+  }
+  //  previous_frame_time = SDL_GetTicks(); // NOTE(tijani): SLOWWW!!! because it locks the OS into this.
+
   cube_rotation.x += 0.01;
   cube_rotation.y += 0.01;
   cube_rotation.z += 0.01;

src/renderer/display.h

@@ -3,6 +3,9 @@
 
 #include <SDL.h>
 
+#define FPS 60
+#define FRAME_TARGET_TIME (1000 / FPS)
+
 SDL_Window *window = NULL;
 SDL_Renderer *renderer = NULL;
 SDL_Texture *colour_buffer_texture = NULL;