From 7ee0ea77415ae54cf3594808a5789991bf8598e5 Mon Sep 17 00:00:00 2001
From: luboslenco <lubos.lenco@gmail.com>
Date: Thu, 12 Dec 2019 23:50:43 +0100
Subject: [PATCH] Auto exposure stubs

---
 Assets/common/shader_datas.arm           | Bin 11544 -> 15585 bytes
 Shaders/common/histogram_pass.frag.glsl  |  17 +++++++++++++++
 Sources/arm/render/RenderPathDeferred.hx |  25 +++++++++++++++++++++++
 Sources/arm/ui/BoxPreferences.hx         |   4 ++++
 Sources/arm/ui/UITrait.hx                |   1 +
 5 files changed, 47 insertions(+)
 create mode 100644 Shaders/common/histogram_pass.frag.glsl

diff --git a/Assets/common/shader_datas.arm b/Assets/common/shader_datas.arm
index d27887a0960493ef07c9b922bf647e2c87ae5e3d..6a23d676c99b49deb1564862e6d5969deb1352ac 100644
GIT binary patch
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diff --git a/Shaders/common/histogram_pass.frag.glsl b/Shaders/common/histogram_pass.frag.glsl
new file mode 100644
index 00000000..61bd8eff
--- /dev/null
+++ b/Shaders/common/histogram_pass.frag.glsl
@@ -0,0 +1,17 @@
+#version 450
+
+uniform sampler2D tex;
+
+in vec2 texCoord;
+out vec4 fragColor;
+
+void main() {
+	const float autoExposureSpeed = 1.0;
+	fragColor.a = 0.01 * autoExposureSpeed;
+	fragColor.rgb = textureLod(tex, vec2(0.5, 0.5), 0.0).rgb +
+					textureLod(tex, vec2(0.2, 0.2), 0.0).rgb +
+					textureLod(tex, vec2(0.8, 0.2), 0.0).rgb +
+					textureLod(tex, vec2(0.2, 0.8), 0.0).rgb +
+					textureLod(tex, vec2(0.8, 0.8), 0.0).rgb;
+	fragColor.rgb /= 5.0;
+}
diff --git a/Sources/arm/render/RenderPathDeferred.hx b/Sources/arm/render/RenderPathDeferred.hx
index 3c35e427..2b5509b5 100644
--- a/Sources/arm/render/RenderPathDeferred.hx
+++ b/Sources/arm/render/RenderPathDeferred.hx
@@ -471,9 +471,34 @@ class RenderPathDeferred {
 		}
 		#end
 
+		// Begin compositor
+		#if rp_autoexposure
+		{
+			{
+				var t = new RenderTargetRaw();
+				t.name = "histogram";
+				t.width = 1;
+				t.height = 1;
+				t.format = "RGBA64";
+				path.createRenderTarget(t);
+				path.loadShader("shader_datas/histogram_pass/histogram_pass");
+			}
+
+			path.setTarget("histogram");
+			path.bindTarget("taa", "tex");
+			path.drawShader("shader_datas/histogram_pass/histogram_pass");
+		}
+		#end
+
 		path.setTarget("buf");
 		path.bindTarget("tex", "tex");
+		#if rp_autoexposure
+		{
+			path.bindTarget("histogram", "histogram");
+		}
+		#end
 		path.drawShader("shader_datas/compositor_pass/compositor_pass");
+		// End compositor
 
 		path.setTarget("buf");
 		var currentG = path.currentG;
diff --git a/Sources/arm/ui/BoxPreferences.hx b/Sources/arm/ui/BoxPreferences.hx
index bd8890b9..3bf7edbb 100644
--- a/Sources/arm/ui/BoxPreferences.hx
+++ b/Sources/arm/ui/BoxPreferences.hx
@@ -182,6 +182,10 @@ class BoxPreferences {
 				UITrait.inst.vignetteStrength = ui.slider(h, "Vignette", 0.0, 1.0, true);
 				if (h.changed) Context.ddirty = 2;
 
+				// var h = Id.handle({value: UITrait.inst.autoExposureStrength});
+				// UITrait.inst.autoExposureStrength = ui.slider(h, "Auto Exposure", 0.0, 2.0, true);
+				// if (h.changed) Context.ddirty = 2;
+
 				#if arm_creator
 				var h = Id.handle({value: UITrait.inst.vxaoExt});
 				UITrait.inst.vxaoExt = ui.slider(h, "VXAO Ext", 1.0, 10.0);
diff --git a/Sources/arm/ui/UITrait.hx b/Sources/arm/ui/UITrait.hx
index 0902e980..54e335c8 100644
--- a/Sources/arm/ui/UITrait.hx
+++ b/Sources/arm/ui/UITrait.hx
@@ -245,6 +245,7 @@ class UITrait {
 	public var vxaoOffset = 1.5;
 	public var vxaoAperture = 1.2;
 	public var vignetteStrength = 0.4;
+	// public var autoExposureStrength = 1.0;
 	public var textureExportPath = "";
 	public var headerHandle = new Handle({layout: Horizontal});
 	public var toolbarHandle = new Handle();