separation to vec.h, generic vector ops, camera class and its usage for spatial rendering

src/rendering/circles.h

@@ -3,8 +3,8 @@
 #define CIRCLES_H
 
 #include "../util.h"
-#include "internal_api.h"
 #include "../context.h"
+#include "internal_api.h"
 
 #include <SDL2/SDL.h>
 #include <stb_ds.h>

src/rendering/sprites.h

@@ -7,6 +7,7 @@
 #include "../context.h"
 #include "../util.h"
 #include "quad_element_buffer.h"
+#include "internal_api.h"
 
 #include <stb_ds.h>
 

src/rendering/triangles.h

@@ -4,6 +4,7 @@
 
 #include "../textures.h"
 #include "../context.h"
+#include "internal_api.h"
 
 #include <stb_ds.h>
 
@@ -66,6 +67,8 @@ static void draw_uncolored_space_traingle_batch(struct mesh_batch *batch,
         t_rect srcrect = textures_get_srcrect(&ctx.texture_cache, texture_key);
         t_rect dims    = textures_get_dims(&ctx.texture_cache, texture_key);
 
+        /* TODO: fast path for uvs mapped directly on srcrect corners? */
+
         const float wr = (float)srcrect.w / (float)dims.w;
         const float hr = (float)srcrect.h / (float)dims.h;
         const float xr = (float)srcrect.x / (float)dims.w;