From a7e3003b3bc7f96d8f9cbbe955cb227cc2f90bc7 Mon Sep 17 00:00:00 2001
From: jorolf <jorolf@gmx.de>
Date: Wed, 7 Nov 2018 00:47:35 +0100
Subject: [PATCH 1/3] add flashlight shader

---
 osu.Game.Resources/Shaders/sh_Flashlight.fs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 osu.Game.Resources/Shaders/sh_Flashlight.fs

diff --git a/osu.Game.Resources/Shaders/sh_Flashlight.fs b/osu.Game.Resources/Shaders/sh_Flashlight.fs
new file mode 100644
index 0000000..b8c4ec7
--- /dev/null
+++ b/osu.Game.Resources/Shaders/sh_Flashlight.fs
@@ -0,0 +1,21 @@
+#ifdef GL_ES
+    precision mediump float;
+#endif
+
+varying vec2 v_Position;
+
+uniform vec2 mousePos;
+uniform float flashlightSize;
+
+const float smoothness = 0.1;
+
+void main(void)
+{
+    vec2 diff = mousePos - v_Position;
+
+    float dist = sqrt(diff.x * diff.x + diff.y * diff.y);
+
+    float smoothnessRange = flashlightSize * smoothness;
+
+    gl_FragColor = vec4(0.0, 0.0, 0.0, smoothstep(flashlightSize, flashlightSize + smoothnessRange, dist));
+}
\ No newline at end of file

From 74407d8c061956edfe28d4ee6de535acdaf394b4 Mon Sep 17 00:00:00 2001
From: jorolf <jorolf@gmx.de>
Date: Fri, 9 Nov 2018 18:44:25 +0100
Subject: [PATCH 2/3] flashlight color can be changed

---
 osu.Game.Resources/Shaders/sh_Flashlight.fs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/osu.Game.Resources/Shaders/sh_Flashlight.fs b/osu.Game.Resources/Shaders/sh_Flashlight.fs
index b8c4ec7..e169cfb 100644
--- a/osu.Game.Resources/Shaders/sh_Flashlight.fs
+++ b/osu.Game.Resources/Shaders/sh_Flashlight.fs
@@ -3,6 +3,7 @@
 #endif
 
 varying vec2 v_Position;
+varying vec4 v_Colour;
 
 uniform vec2 mousePos;
 uniform float flashlightSize;
@@ -17,5 +18,5 @@ void main(void)
 
     float smoothnessRange = flashlightSize * smoothness;
 
-    gl_FragColor = vec4(0.0, 0.0, 0.0, smoothstep(flashlightSize, flashlightSize + smoothnessRange, dist));
+    gl_FragColor = v_Colour * vec4(1.0, 1.0, 1.0, smoothstep(flashlightSize, flashlightSize + smoothnessRange, dist));
 }
\ No newline at end of file

From a1fb917e1589fbdfac1aa7a3acc9ebb5a5933c89 Mon Sep 17 00:00:00 2001
From: jorolf <jorolf@gmx.de>
Date: Sun, 11 Nov 2018 18:39:04 +0100
Subject: [PATCH 3/3] add sh_PositionAndColour and update sh_Flashlight

---
 osu.Game.Resources/Shaders/sh_Flashlight.fs   | 26 ++++++++++++++-----
 .../Shaders/sh_PositionAndColour.vs           | 14 ++++++++++
 2 files changed, 33 insertions(+), 7 deletions(-)
 create mode 100644 osu.Game.Resources/Shaders/sh_PositionAndColour.vs

diff --git a/osu.Game.Resources/Shaders/sh_Flashlight.fs b/osu.Game.Resources/Shaders/sh_Flashlight.fs
index e169cfb..bd364fa 100644
--- a/osu.Game.Resources/Shaders/sh_Flashlight.fs
+++ b/osu.Game.Resources/Shaders/sh_Flashlight.fs
@@ -5,18 +5,30 @@
 varying vec2 v_Position;
 varying vec4 v_Colour;
 
-uniform vec2 mousePos;
-uniform float flashlightSize;
+uniform bool rectangular;
+uniform vec2 flashlightPos;
+uniform float circularFlashlightSize;
+uniform vec2 rectangularFlashlightSize;
 
-const float smoothness = 0.1;
+const float smoothness = 1.1;
 
 void main(void)
 {
-    vec2 diff = mousePos - v_Position;
+    if(rectangular)
+    {
+        vec2 diff = abs(v_Position - flashlightPos);
 
-    float dist = sqrt(diff.x * diff.x + diff.y * diff.y);
+        float alpha = 1.0 - smoothstep(rectangularFlashlightSize.x, rectangularFlashlightSize.x * smoothness, diff.x);
+        alpha *= 1.0 - smoothstep(rectangularFlashlightSize.y, rectangularFlashlightSize.y * smoothness, diff.y);
 
-    float smoothnessRange = flashlightSize * smoothness;
+        gl_FragColor  = v_Colour * vec4(1.0, 1.0, 1.0, 1.0 - alpha);
+    }
+    else
+    {
+        vec2 diff = flashlightPos - v_Position;
 
-    gl_FragColor = v_Colour * vec4(1.0, 1.0, 1.0, smoothstep(flashlightSize, flashlightSize + smoothnessRange, dist));
+        float dist = sqrt(diff.x * diff.x + diff.y * diff.y);
+
+        gl_FragColor = v_Colour * vec4(1.0, 1.0, 1.0, smoothstep(circularFlashlightSize, circularFlashlightSize * smoothness, dist));
+    }
 }
\ No newline at end of file
diff --git a/osu.Game.Resources/Shaders/sh_PositionAndColour.vs b/osu.Game.Resources/Shaders/sh_PositionAndColour.vs
new file mode 100644
index 0000000..c267530
--- /dev/null
+++ b/osu.Game.Resources/Shaders/sh_PositionAndColour.vs
@@ -0,0 +1,14 @@
+attribute vec2 m_Position;
+attribute vec4 m_Colour;
+
+varying vec2 v_Position;
+varying vec4 v_Colour;
+
+uniform mat4 g_ProjMatrix;
+
+void main(void)
+{
+	gl_Position = g_ProjMatrix * vec4(m_Position.xy, 1.0, 1.0);
+	v_Position = m_Position;
+	v_Colour = m_Colour;
+}
\ No newline at end of file