From 24a86ba6e3624ec5840ebed0b9c23a152fe710c3 Mon Sep 17 00:00:00 2001
From: Abdelrahman <said.abdelrahman89@gmail.com>
Date: Fri, 30 Dec 2022 00:44:49 +0000
Subject: [PATCH] Added API functions for modulating the colour and alpha of a
 texture

---
 include/GameEngine.h |  2 ++
 include/Renderer.h   |  3 +++
 src/GameEngine.c     | 28 ++++++++++++++++++++++++++++
 src/Renderer.c       |  8 ++++++++
 4 files changed, 41 insertions(+)

diff --git a/include/GameEngine.h b/include/GameEngine.h
index 2f6c53e..88ca6aa 100644
--- a/include/GameEngine.h
+++ b/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);
diff --git a/include/Renderer.h b/include/Renderer.h
index 45125c4..398c47c 100644
--- a/include/Renderer.h
+++ b/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);
diff --git a/src/GameEngine.c b/src/GameEngine.c
index 178a8da..c144db6 100644
--- a/src/GameEngine.c
+++ b/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 = {};
 
diff --git a/src/Renderer.c b/src/Renderer.c
index d81e4ec..c7d3ac4 100644
--- a/src/Renderer.c
+++ b/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;