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);

src/GameEngine.c

@@ -326,6 +326,34 @@ void render_texture_asset(AssetID id, RenderRect *src, RenderRect *dest) {
   render_texture(GameEngine.window.renderer, texture, src, dest);
 }
 
+void modulate_texture_color(AssetID id, SDL_Color color) {
+  if (id < 0) {
+    return;
+  }
+
+  SDL_Texture *texture = get_texture(GameEngine.asset_manager, id);
+
+  if (!texture) {
+    return;
+  }
+
+  set_texture_color_modulation(texture, color);
+}
+
+void modulate_texture_alpha(AssetID id, u8 alpha) {
+  if (id < 0) {
+    return;
+  }
+
+  SDL_Texture *texture = get_texture(GameEngine.asset_manager, id);
+
+  if (!texture) {
+    return;
+  }
+
+  set_texture_alpha_modulation(texture, alpha);
+}
+
 TextSize get_text_size_from_font_asset(AssetID id, const char *text) {
   TextSize output = {};
 

src/Renderer.c

@@ -47,6 +47,14 @@ void set_render_draw_color(const Renderer *renderer, SDL_Color color) {
                          color.a);
 }
 
+void set_texture_color_modulation(SDL_Texture *texture, SDL_Color color) {
+  SDL_SetTextureColorMod(texture, color.r, color.g, color.b);
+}
+
+void set_texture_alpha_modulation(SDL_Texture *texture, u8 alpha) {
+  SDL_SetTextureAlphaMod(texture, alpha);
+}
+
 void render_clear(const Renderer *renderer, SDL_Color color) {
   if (!renderer || !(renderer->SDL_base_renderer)) {
     return;