From 2351d4114cb2ee15231f75f9cfa38d8d3878a717 Mon Sep 17 00:00:00 2001
From: veclavtalica <veclavtalica@tutamail.com>
Date: Tue, 14 Jan 2025 02:53:18 +0300
Subject: [PATCH] twn_draw.c: add draw_quad()

---
 include/twn_draw.h       |  8 ++++++++
 share/twn_api.json       | 15 +++++++++++++++
 src/rendering/twn_draw.c | 25 +++++++++++++++++++++++++
 3 files changed, 48 insertions(+)

diff --git a/include/twn_draw.h b/include/twn_draw.h
index 757e55a..e81a045 100644
--- a/include/twn_draw.h
+++ b/include/twn_draw.h
@@ -55,6 +55,14 @@ TWN_API void draw_triangle(char const *texture,
                            Color       c1,      /* optional, default: all 255 */
                            Color       c2);     /* optional, default: all 255 */
 
+TWN_API void draw_quad(char const *texture,
+                       Vec3        v0,          /* upper-left */
+                       Vec3        v1,          /* bottom-left */
+                       Vec3        v2,          /* bottom-right */
+                       Vec3        v3,          /* upper-right */
+                       Rect        texture_region,
+                       Color       color);      /* optional, default: all 255 */
+
 TWN_API void draw_billboard(const char *texture,
                             Vec3 position,
                             Vec2 size,
diff --git a/share/twn_api.json b/share/twn_api.json
index 2e3f7c9..964deae 100644
--- a/share/twn_api.json
+++ b/share/twn_api.json
@@ -145,6 +145,21 @@
             ]
         },
 
+        "draw_quad": {
+            "module": "draw",
+            "symbol": "quad",
+            "header": "twn_draw.h",
+            "params": [
+                { "name": "texture", "type": "char *" },
+                { "name": "v0", "type": "Vec3" },
+                { "name": "v1", "type": "Vec3" },
+                { "name": "v2", "type": "Vec3" },
+                { "name": "v3", "type": "Vec3" },
+                { "name": "texture_region", "type": "Rect" },
+                { "name": "color", "type": "Color", "default": { "r": 255, "g": 255, "b": 255, "a": 255 } }
+            ]
+        },
+
         "draw_billboard": {
             "module": "draw",
             "symbol": "billboard",
diff --git a/src/rendering/twn_draw.c b/src/rendering/twn_draw.c
index 0a2dd73..35ff13d 100644
--- a/src/rendering/twn_draw.c
+++ b/src/rendering/twn_draw.c
@@ -179,6 +179,31 @@ void draw_nine_slice(const char *texture, Vec2 corners, Rect rect, float border_
 }
 
 
+TWN_API void draw_quad(char const *texture,
+                       Vec3        v0,          /* upper-left */
+                       Vec3        v1,          /* bottom-left */
+                       Vec3        v2,          /* bottom-right */
+                       Vec3        v3,          /* upper-right */
+                       Rect        texture_region,
+                       Color       color)
+{
+    Vec2 const uv0 = { texture_region.x,                    texture_region.y };
+    Vec2 const uv1 = { texture_region.x,                    texture_region.y + texture_region.h };
+    Vec2 const uv2 = { texture_region.x + texture_region.w, texture_region.y + texture_region.h };
+    Vec2 const uv3 = { texture_region.x + texture_region.w, texture_region.y };
+
+    draw_triangle(texture,
+                  v0, v1, v3,
+                  uv0, uv1, uv3,
+                  color, color, color);
+
+    draw_triangle(texture,
+                  v3, v1, v2,
+                  uv3, uv1, uv2,
+                  color, color, color);
+}
+
+
 static void render_2d(void) {
     use_2d_pipeline();