Add perspective projection support

src/obj.c

@@ -204,7 +204,8 @@ bool init_render(Arena *arena, Render *render, u64 width, u64 height) {
 }
 
 void render_model(const Model *model, Render *render, Colour colour,
-                  RenderType type, ColourType colour_type) {
+                  RenderType type, ColourType colour_type,
+                  ProjectionType projection) {
   Triangle triangle;
 
   for (u64 i = 0; i < model->triangles->count; ++i) {
@@ -215,12 +216,13 @@ void render_model(const Model *model, Render *render, Colour colour,
                         .b = rand() % UINT8_MAX,
                         .a = 255};
     }
-    render_triangle(&triangle, model, render, colour, type);
+    render_triangle(&triangle, model, render, colour, type, projection);
   }
 }
 
 internal void render_triangle(const Triangle *triangle, const Model *model,
-                              Render *render, Colour colour, RenderType type) {
+                              Render *render, Colour colour, RenderType type,
+                              ProjectionType projection) {
   Image *img = &(render->img);
   Vertex vertices[TRIANGLE_VERTICES] = {
       list_get(model->vertices, triangle->p0),

src/obj.h

@@ -47,6 +47,13 @@ typedef enum {
   COUNT_COLOUR_TYPE,
 } ColourType;
 
+typedef enum {
+  PROJECTION_TYPE_ORTHOGRAPHIC,
+  PROJECTION_TYPE_PERSPECTIVE,
+
+  COUNT_PROJECTION_TYPE,
+} ProjectionType;
+
 MAKE_LIST_TYPE(Vertex);
 MAKE_LIST_TYPE(TexCoord);
 MAKE_LIST_TYPE(Triangle);
@@ -68,6 +75,7 @@ struct render {
 Model load_obj_file(Arena *arena, const char *filename, const char *texture);
 bool init_render(Arena *arena, Render *render, u64 width, u64 height);
 void render_model(const Model *model, Render *render, Colour colour,
-                  RenderType type, ColourType colour_type);
+                  RenderType type, ColourType colour_type,
+                  ProjectionType projection);
 
 #endif // OBJ_H