From 24516b592e293afe008224440d12f8aa5c55b651 Mon Sep 17 00:00:00 2001
From: Martin Felis <martin@fysx.org>
Date: Mon, 25 Jun 2018 20:20:36 +0200
Subject: [PATCH] Added SSAOPower variable and exposed to GUI

---
 data/shaders/fs_ssao.glsl   | 3 ++-
 src/modules/RenderModule.cc | 2 ++
 src/modules/RenderModule.h  | 1 +
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/data/shaders/fs_ssao.glsl b/data/shaders/fs_ssao.glsl
index ef16ccf..7a6312d 100644
--- a/data/shaders/fs_ssao.glsl
+++ b/data/shaders/fs_ssao.glsl
@@ -10,6 +10,7 @@ uniform sampler2D uNoise;
 
 uniform float uRadius;
 uniform float uBias;
+uniform float uPower;
 uniform int uSampleCount;
 uniform vec3 uSamples[64];
 uniform mat4 uProjection;
@@ -40,6 +41,6 @@ void main() {
 		occlusion += (sample_depth >= sample.z + uBias ? 1.0 : 0.0) * range_check; 
 	}
 
-	occlusion = 1.0 - (occlusion / uSampleCount);
+	occlusion = pow(1.0 - (occlusion / uSampleCount), uPower);
 	outColor = vec3(occlusion);	
 }
diff --git a/src/modules/RenderModule.cc b/src/modules/RenderModule.cc
index f4fecb1..869277c 100644
--- a/src/modules/RenderModule.cc
+++ b/src/modules/RenderModule.cc
@@ -631,6 +631,7 @@ void Renderer::RenderGl() {
 
 		mSSAOProgram.SetFloat("uRadius", mSSAORadius);
 		mSSAOProgram.SetFloat("uBias", mSSAOBias);
+		mSSAOProgram.SetFloat("uPower", mSSAOPower);
 		mSSAOProgram.SetInt("uSampleCount", mSSAOKernel.size());
 		mSSAOProgram.SetMat44("uProjection", mCamera.mProjectionMatrix);
 
@@ -845,6 +846,7 @@ void Renderer::DrawGui() {
 		if (mIsSSAOEnabled) {
 			ImGui::SliderFloat("Radius", &mSSAORadius, 0.0f, 1.0f);
 			ImGui::SliderFloat("Bias", &mSSAOBias, 0.0f, 0.1f);
+			ImGui::SliderFloat("Power", &mSSAOPower, 1.0f, 10.0f);
 			ImGui::SliderInt("Samples", &mSSAOKernelSize, 1, 64);
 			ImGui::SliderInt("Blur Size", &mSSAOBlurSize, 0, 8);
 			ImGui::Checkbox("Disable Color", &mSSAODisableColor);
diff --git a/src/modules/RenderModule.h b/src/modules/RenderModule.h
index 3aca00b..6229f9c 100644
--- a/src/modules/RenderModule.h
+++ b/src/modules/RenderModule.h
@@ -90,6 +90,7 @@ struct Renderer {
 
 	float mSSAORadius = 0.5f;
 	float mSSAOBias = 0.025f;
+	float mSSAOPower = 1.0f;
 	int mSSAOKernelSize = 64;
 	std::vector<Vector3f> mSSAOKernel;
 	GLuint mSSAONoiseTexture = -1;