From 7c33107585ac3217adab850a13e7bdbad8791d0a Mon Sep 17 00:00:00 2001
From: veclavtalica <veclavtalica@tutamail.com>
Date: Mon, 27 Jan 2025 05:05:43 +0300
Subject: [PATCH] game.background_color option in twn.toml

---
 src/rendering/twn_draw.c   |  2 +-
 src/twn_engine_context_c.h |  2 ++
 src/twn_loop.c             | 35 +++++++++++++++++++++++++++++++++++
 3 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/src/rendering/twn_draw.c b/src/rendering/twn_draw.c
index 517fef0..3f528bb 100644
--- a/src/rendering/twn_draw.c
+++ b/src/rendering/twn_draw.c
@@ -500,7 +500,7 @@ void clear_draw_buffer(void) {
             .clear_color = true,
             .clear_depth = true,
             .clear_stencil = true,
-            .color = (Color) { 230, 230, 230, 1 }
+            .color = ctx.background_color,
         }
     };
 
diff --git a/src/twn_engine_context_c.h b/src/twn_engine_context_c.h
index 4b89e1a..dac04b2 100644
--- a/src/twn_engine_context_c.h
+++ b/src/twn_engine_context_c.h
@@ -73,6 +73,8 @@ typedef struct EngineContext {
     SDL_Window *window;
     uint32_t window_id;
 
+    Color background_color;
+
     bool is_running;
     bool window_size_has_changed;
     bool resync_flag;
diff --git a/src/twn_loop.c b/src/twn_loop.c
index c05b592..a769862 100644
--- a/src/twn_loop.c
+++ b/src/twn_loop.c
@@ -510,6 +510,41 @@ static bool initialize(void) {
     ctx.window_dims.x = (float)ctx.base_render_width;
     ctx.window_dims.y = (float)ctx.base_render_height;
 
+    ctx.background_color = (Color){ 230, 230, 230, 255 };
+
+    toml_array_t *datum_background_color = toml_array_in(game, "background_color");
+    if (datum_background_color) do {
+        toml_datum_t datum_background_color_red = toml_int_at(datum_background_color, 0);
+        if (!datum_background_color_red.ok || datum_background_color_red.u.i < 0 || datum_background_color_red.u.i >= 256) {
+            log_warn("Invalid value for red channel of game.background_color");
+            break;
+        }
+        toml_datum_t datum_background_color_green = toml_int_at(datum_background_color, 1);
+        if (!datum_background_color_green.ok || datum_background_color_green.u.i < 0 || datum_background_color_green.u.i >= 256) {
+            log_warn("Invalid value for green channel of game.background_color");
+            break;
+        }
+        toml_datum_t datum_background_color_blue = toml_int_at(datum_background_color, 2);
+        if (!datum_background_color_blue.ok || datum_background_color_blue.u.i < 0 || datum_background_color_blue.u.i >= 256) {
+            log_warn("Invalid value for blue channel of game.background_color");
+            break;
+        }
+        toml_datum_t datum_background_color_alpha = toml_int_at(datum_background_color, 3);
+        if (!datum_background_color_alpha.ok || datum_background_color_alpha.u.i < 0 || datum_background_color_alpha.u.i >= 256) {
+            log_warn("Invalid value for alpha channel of game.background_color");
+            break;
+        }
+        ctx.background_color = (Color){
+            (uint8_t)datum_background_color_red.u.i,
+            (uint8_t)datum_background_color_green.u.i,
+            (uint8_t)datum_background_color_blue.u.i,
+            (uint8_t)datum_background_color_alpha.u.i,
+        };
+    } while (0);
+
+    ctx.game.resolution.x = (float)ctx.base_render_width;
+    ctx.game.resolution.y = (float)ctx.base_render_height;
+
     /* add a watcher for immediate updates on window size */
     SDL_AddEventWatch(event_callback, NULL);