From 2c2c02796e9df82d0cda12b59aad638d40b4e8b4 Mon Sep 17 00:00:00 2001
From: Daniel Karbach <daniel.karbach@localhorst.tv>
Date: Thu, 23 Jul 2015 10:34:49 +0200
Subject: [PATCH] fancy crosshair

don't use on .5 gray ;)
---
 src/app/init.cpp        | 7 ++++++-
 src/app/init.hpp        | 3 ++-
 src/graphics/shader.cpp | 2 +-
 src/ui/ui.cpp           | 2 ++
 4 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/app/init.cpp b/src/app/init.cpp
index 6fa2dfd..9c97c9f 100644
--- a/src/app/init.cpp
+++ b/src/app/init.cpp
@@ -175,7 +175,12 @@ void GLContext::EnableAlphaBlending() noexcept {
 	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 }
 
-void GLContext::DisableAlphaBlending() noexcept {
+void GLContext::EnableInvertBlending() noexcept {
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_ONE_MINUS_DST_COLOR, GL_ZERO);
+}
+
+void GLContext::DisableBlending() noexcept {
 	glDisable(GL_BLEND);
 }
 
diff --git a/src/app/init.hpp b/src/app/init.hpp
index cd0d9be..f0777c8 100644
--- a/src/app/init.hpp
+++ b/src/app/init.hpp
@@ -97,7 +97,8 @@ public:
 	static void EnableDepthTest() noexcept;
 	static void EnableBackfaceCulling() noexcept;
 	static void EnableAlphaBlending() noexcept;
-	static void DisableAlphaBlending() noexcept;
+	static void EnableInvertBlending() noexcept;
+	static void DisableBlending() noexcept;
 
 	static void Clear() noexcept;
 	static void ClearDepthBuffer() noexcept;
diff --git a/src/graphics/shader.cpp b/src/graphics/shader.cpp
index 41c1faf..c38f9af 100644
--- a/src/graphics/shader.cpp
+++ b/src/graphics/shader.cpp
@@ -321,7 +321,7 @@ BlockLighting::BlockLighting()
 void BlockLighting::Activate() noexcept {
 	GLContext::EnableDepthTest();
 	GLContext::EnableBackfaceCulling();
-	GLContext::DisableAlphaBlending();
+	GLContext::DisableBlending();
 	program.Use();
 }
 
diff --git a/src/ui/ui.cpp b/src/ui/ui.cpp
index 8e48f14..4775999 100644
--- a/src/ui/ui.cpp
+++ b/src/ui/ui.cpp
@@ -89,10 +89,12 @@ void HUD::Render(DirectionalLighting &world_prog, BlendedSprite &sprite_prog) no
 	world_prog.SetFogDensity(0.0f);
 	GLContext::ClearDepthBuffer();
 
+	GLContext::EnableInvertBlending();
 	world_prog.SetMVP(crosshair_transform, view, projection);
 	crosshair.Draw();
 
 	if (block_visible) {
+		GLContext::DisableBlending();
 		world_prog.SetM(block_transform);
 		block.Draw();
 
-- 
2.39.2