Added API functions for modulating the colour and alpha of a texture

include/GameEngine.h

@@ -74,6 +74,8 @@ void clip_render_rects_to_drawing_area(RenderRect *src, RenderRect *dest);
 
 RenderRect get_texture_asset_rect(AssetID id);
 void render_texture_asset(AssetID id, RenderRect *src, RenderRect *dest);
+void modulate_texture_color(AssetID id, SDL_Color color);
+void modulate_texture_alpha(AssetID id, u8 alpha);
 TextSize get_text_size_from_font_asset(AssetID id, const char *text);
 void render_text_with_font_asset(AssetID id, const char *text, f32 x, f32 y,
                                  SDL_Color color);

include/Renderer.h

@@ -7,6 +7,7 @@
 #include "SDL_surface.h"
 #include "SDL_video.h"
 #include "aliases.h"
+#include <aliases.h>
 #include <stdbool.h>
 
 #ifdef __cplusplus
@@ -43,6 +44,8 @@ Renderer *create_renderer(SDL_Window *window);
 void get_render_output_size(Renderer *renderer, i32 *w, i32 *h);
 
 void set_render_draw_color(const Renderer *renderer, SDL_Color color);
+void set_texture_color_modulation(SDL_Texture *texture, SDL_Color color);
+void set_texture_alpha_modulation(SDL_Texture *texture, u8 alpha);
 void render_clear(const Renderer *renderer, SDL_Color color);
 void draw_rect(const Renderer *renderer, SDL_Color color, f32 x, f32 y, f32 w,
                f32 h);