From ebda20ff9cfb3c9be105d39838daa5336019623f Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Sun, 13 Jun 2021 14:14:25 +0300
Subject: [PATCH] Support drawing multi-color triangles in gfx::painter

---
 libs/gfx/include/psemek/gfx/painter.hpp |  1 +
 libs/gfx/source/painter.cpp             | 11 ++++++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/libs/gfx/include/psemek/gfx/painter.hpp b/libs/gfx/include/psemek/gfx/painter.hpp
index e8d352eb..0068c5b8 100644
--- a/libs/gfx/include/psemek/gfx/painter.hpp
+++ b/libs/gfx/include/psemek/gfx/painter.hpp
@@ -53,6 +53,7 @@ namespace psemek::gfx
 
 		// 2D
 		void triangle(geom::point<float, 2> const & p0, geom::point<float, 2> const & p1, geom::point<float, 2> const & p2, color const & c);
+		void triangle(geom::point<float, 2> const & p0, geom::point<float, 2> const & p1, geom::point<float, 2> const & p2, color const & c0, color const & c1, color const & c2);
 		void rect(geom::box<float, 2> const & box, color const & c);
 		void circle(geom::point<float, 2> const & center, float radius, color const & c, int quality = 24);
 		void line(geom::point<float, 2> const & p0, geom::point<float, 2> const & p1, float width, color const & c, bool smooth = true);
diff --git a/libs/gfx/source/painter.cpp b/libs/gfx/source/painter.cpp
index 3229ad7f..e307fd94 100644
--- a/libs/gfx/source/painter.cpp
+++ b/libs/gfx/source/painter.cpp
@@ -184,12 +184,17 @@ namespace psemek::gfx
 	painter::~painter() = default;
 
 	void painter::triangle(geom::point<float, 2> const & p0, geom::point<float, 2> const & p1, geom::point<float, 2> const & p2, color const & c)
+	{
+		triangle(p0, p1, p2, c, c, c);
+	}
+
+	void painter::triangle(geom::point<float, 2> const & p0, geom::point<float, 2> const & p1, geom::point<float, 2> const & p2, color const & c0, color const & c1, color const & c2)
 	{
 		std::uint32_t const base = impl().vertices.size();
 
-		impl().vertices.push_back({{p0[0], p0[1], 0.f}, c});
-		impl().vertices.push_back({{p1[0], p1[1], 0.f}, c});
-		impl().vertices.push_back({{p2[0], p2[1], 0.f}, c});
+		impl().vertices.push_back({{p0[0], p0[1], 0.f}, c0});
+		impl().vertices.push_back({{p1[0], p1[1], 0.f}, c1});
+		impl().vertices.push_back({{p2[0], p2[1], 0.f}, c2});
 
 		impl().indices.push_back(base + 0);
 		impl().indices.push_back(base + 1);