From 7477cda527451c3d6629c76d4cd364d69eda7716 Mon Sep 17 00:00:00 2001
From: Noel Berry <thenberry@gmail.com>
Date: Sat, 12 Feb 2022 23:15:04 -0800
Subject: [PATCH] added default Additive BlendMode

---
 include/blah/drawing/batch.h |  2 +-
 include/blah/graphics.h      |  3 +--
 src/graphics.cpp             | 12 ++++++++++++
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/include/blah/drawing/batch.h b/include/blah/drawing/batch.h
index 800acd7..fe94584 100644
--- a/include/blah/drawing/batch.h
+++ b/include/blah/drawing/batch.h
@@ -16,7 +16,7 @@ namespace Blah
 		Normal,
 
 		// Ignores the texture color but still uses transparency, essentially
-		// drawing the "shape" of the texture a solid color
+		// drawing the "shape" of the texture as a solid color
 		Wash
 	};
 
diff --git a/include/blah/graphics.h b/include/blah/graphics.h
index 398fb26..d38b6dd 100644
--- a/include/blah/graphics.h
+++ b/include/blah/graphics.h
@@ -115,9 +115,8 @@ namespace Blah
 	{
 		// Normal, pre-multiplied, Blend Mode
 		static const BlendMode Normal;
-
-		// Subtractive Blend Mode
 		static const BlendMode Subtract;
+		static const BlendMode Additive;
 
 		BlendOp color_op;
 		BlendFactor color_src;
diff --git a/src/graphics.cpp b/src/graphics.cpp
index 803d449..5f3b543 100644
--- a/src/graphics.cpp
+++ b/src/graphics.cpp
@@ -25,6 +25,18 @@ const BlendMode BlendMode::Subtract = BlendMode(
 	0xffffffff
 );
 
+const BlendMode BlendMode::Additive = BlendMode(
+	BlendOp::Add,
+	BlendFactor::SrcAlpha,
+	BlendFactor::One,
+	BlendOp::Add,
+	BlendFactor::SrcAlpha,
+	BlendFactor::One,
+	BlendMask::RGBA,
+	0xffffffff
+);
+
+
 VertexFormat::VertexFormat(const StackVector<VertexAttribute, 16>& attr, int str)
 {
 	attributes = attr;