From 9df79a4b2d68979c3e15797d518d957787ba4e21 Mon Sep 17 00:00:00 2001
From: x2048 <codeforsmile@gmail.com>
Date: Thu, 29 Sep 2022 20:34:05 +0200
Subject: Bloom (#12791)

Adds configurable light exposure control and bloom effect (light bleeding) with client-side settings.
---
 client/shaders/extract_bloom/opengl_fragment.glsl | 21 +++++++++++++++++++++
 client/shaders/extract_bloom/opengl_vertex.glsl   | 11 +++++++++++
 2 files changed, 32 insertions(+)
 create mode 100644 client/shaders/extract_bloom/opengl_fragment.glsl
 create mode 100644 client/shaders/extract_bloom/opengl_vertex.glsl

(limited to 'client/shaders/extract_bloom')

diff --git a/client/shaders/extract_bloom/opengl_fragment.glsl b/client/shaders/extract_bloom/opengl_fragment.glsl
new file mode 100644
index 000000000..8c25328ac
--- /dev/null
+++ b/client/shaders/extract_bloom/opengl_fragment.glsl
@@ -0,0 +1,21 @@
+#define rendered texture0
+
+uniform sampler2D rendered;
+uniform mediump float exposureFactor = 2.5;
+uniform float bloomLuminanceThreshold = 1.0;
+
+#ifdef GL_ES
+varying mediump vec2 varTexCoord;
+#else
+centroid varying vec2 varTexCoord;
+#endif
+
+
+void main(void)
+{
+	vec2 uv = varTexCoord.st;
+	vec4 color = texture2D(rendered, uv).rgba;
+	// translate to linear colorspace (approximate)
+	color.rgb = pow(color.rgb, vec3(2.2)) * exposureFactor;
+	gl_FragColor = vec4(color.rgb, 1.0); // force full alpha to avoid holes in the image.
+}
diff --git a/client/shaders/extract_bloom/opengl_vertex.glsl b/client/shaders/extract_bloom/opengl_vertex.glsl
new file mode 100644
index 000000000..12692c296
--- /dev/null
+++ b/client/shaders/extract_bloom/opengl_vertex.glsl
@@ -0,0 +1,11 @@
+#ifdef GL_ES
+varying mediump vec2 varTexCoord;
+#else
+centroid varying vec2 varTexCoord;
+#endif
+
+void main(void)
+{
+	varTexCoord.st = inTexCoord0.st;
+	gl_Position = inVertexPosition;
+}
-- 
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