From ccad59a17a80011c69a69d5398a92f01900f8ef1 Mon Sep 17 00:00:00 2001
From: codifies <you@example.com>
Date: Wed, 24 Mar 2021 21:23:58 +0000
Subject: [PATCH] adds DrawTexturedPoly with example

---
 examples/Makefile |  3 ++-
 src/raylib.h      |  1 +
 src/shapes.c      | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/examples/Makefile b/examples/Makefile
index ac42ea986..cabbc99a6 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -416,7 +416,8 @@ SHAPES = \
     shapes/shapes_easings_rectangle_array \
     shapes/shapes_draw_ring \
     shapes/shapes_draw_circle_sector \
-    shapes/shapes_draw_rectangle_rounded
+    shapes/shapes_draw_rectangle_rounded \
+    shapes/shapes_textured_polygon
 
 TEXTURES = \
     textures/textures_logo_raylib \
diff --git a/src/raylib.h b/src/raylib.h
index d02ec4b33..99fce14e9 100644
--- a/src/raylib.h
+++ b/src/raylib.h
@@ -1147,6 +1147,7 @@ RLAPI void DrawTriangleFan(Vector2 *points, int pointsCount, Color color);
 RLAPI void DrawTriangleStrip(Vector2 *points, int pointsCount, Color color);                             // Draw a triangle strip defined by points
 RLAPI void DrawPoly(Vector2 center, int sides, float radius, float rotation, Color color);               // Draw a regular polygon (Vector version)
 RLAPI void DrawPolyLines(Vector2 center, int sides, float radius, float rotation, Color color);          // Draw a polygon outline of n sides
+RLAPI void DrawTexturedPoly(Texture t, float x, float y, Vector2 *points, Vector2 *tPnts, int numPoints, Color colour); // Draw a textured polygon
 
 // Basic shapes collision detection functions
 RLAPI bool CheckCollisionRecs(Rectangle rec1, Rectangle rec2);                                           // Check collision between two rectangles
diff --git a/src/shapes.c b/src/shapes.c
index b615f78af..e8974662f 100644
--- a/src/shapes.c
+++ b/src/shapes.c
@@ -1419,6 +1419,48 @@ void DrawPolyLines(Vector2 center, int sides, float radius, float rotation, Colo
     rlPopMatrix();
 }
 
+
+// t            texture to use
+// x,y          position to draw the poly (centre)
+// points       points of the poly (relative to 0,0)
+// tPnts        uv coordinates
+// numPoints    number of points in the poly
+// colour       the tint of the poly
+//
+// NB centre (0,0) must have straight line path to all points
+// without crossing perimeter, points must be in anticlockwise
+// order
+void DrawTexturedPoly(Texture t, float x, float y,
+                        Vector2 *points, Vector2 *tPnts,
+                        int numPoints, Color colour)
+{
+    rlEnableTexture(t.id);
+
+    // for some reason texturing doesn't work on trianglesso make a 
+    // degenerate QUAD, DrawTriangleFan does this too why ?
+    rlCheckRenderBatchLimit((numPoints-1)*4);
+    rlBegin(RL_QUADS);
+    rlColor4ub(colour.r, colour.g, colour.b, colour.a);
+
+    for (int i = 0; i < numPoints-1; i++)
+    {
+        rlTexCoord2f(0.5, 0.5);
+        rlVertex2f(x, y);
+
+        rlTexCoord2f(tPnts[i].x, tPnts[i].y);
+        rlVertex2f(points[i].x + x, points[i].y + y);
+
+        rlTexCoord2f(tPnts[i + 1].x, tPnts[i + 1].y);
+        rlVertex2f(points[i + 1].x + x, points[i + 1].y + y);
+
+        rlTexCoord2f(tPnts[i + 1].x, tPnts[i + 1].y);
+        rlVertex2f(points[i + 1].x + x, points[i + 1].y + y);
+    }
+    rlEnd();
+    rlDisableTexture();
+
+}
+
 //----------------------------------------------------------------------------------
 // Module Functions Definition - Collision Detection functions
 //----------------------------------------------------------------------------------