From 90d7d405711de8920c9823bdeb23842edb29efb2 Mon Sep 17 00:00:00 2001
From: Alexander Gauggel <agauggel@uni-koblenz.de>
Date: Wed, 11 Aug 2021 15:57:14 +0200
Subject: [PATCH] [#106] Add motion blur early out for barely moving pixels
---
.../resources/shaders/motionBlurDummy.comp | 10 ++++++++++
projects/indirect_dispatch/src/App.cpp | 13 +++++++++----
2 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/projects/indirect_dispatch/resources/shaders/motionBlurDummy.comp b/projects/indirect_dispatch/resources/shaders/motionBlurDummy.comp
index 55ea9e0c..a57319b9 100644
--- a/projects/indirect_dispatch/resources/shaders/motionBlurDummy.comp
+++ b/projects/indirect_dispatch/resources/shaders/motionBlurDummy.comp
@@ -11,6 +11,7 @@ layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
layout( push_constant ) uniform constants{
// computed from delta time and shutter speed
float motionFactor;
+ float minVelocity;
};
@@ -24,6 +25,15 @@ void main(){
vec2 uv = vec2(coord) / textureRes;
vec2 motion = texture(sampler2D(inMotion, textureSampler), uv).rg;
+ float velocity = length(motion);
+
+ // early out on little movement
+ if(velocity < minVelocity){
+ vec3 color = texture(sampler2D(inColor, textureSampler), uv).rgb;
+ imageStore(outImage, coord, vec4(color, 0.f));
+ return;
+ }
+
motion *= motionFactor;
vec3 color = vec3(0);
diff --git a/projects/indirect_dispatch/src/App.cpp b/projects/indirect_dispatch/src/App.cpp
index 9bcf3a57..e8987aa0 100644
--- a/projects/indirect_dispatch/src/App.cpp
+++ b/projects/indirect_dispatch/src/App.cpp
@@ -101,8 +101,9 @@ void App::run() {
eDebugView debugView = eDebugView::None;
eMotionBlurInput motionBlurInput = eMotionBlurInput::MotionVectorMaxTileNeighbourhood;
- float objectVerticalSpeed = 0.005;
- int cameraShutterSpeedInverse = 48;
+ float objectVerticalSpeed = 0.005;
+ float motionBlurMinVelocity = 0.001;
+ int cameraShutterSpeedInverse = 48;
glm::mat4 mvpPrevious = glm::mat4(1.f);
glm::mat4 viewProjectionPrevious = m_cameraManager.getActiveCamera().getMVP();
@@ -285,8 +286,11 @@ void App::run() {
const float fDeltatimeSeconds = microsecondToSecond * std::chrono::duration_cast<std::chrono::microseconds>(frameEndTime - frameStartTime).count();
const float motionBlurMotionFactor = 1 / (fDeltatimeSeconds * cameraShutterSpeedInverse);
- vkcv::PushConstants motionBlurPushConstants(sizeof(float));
- motionBlurPushConstants.appendDrawcall(motionBlurMotionFactor);
+ vkcv::PushConstants motionBlurPushConstants(sizeof(float) * 2);
+
+ float motionBlurConstantData[2] = { motionBlurMotionFactor, motionBlurMinVelocity };
+
+ motionBlurPushConstants.appendDrawcall(motionBlurConstantData);
m_core.recordComputeDispatchToCmdStream(
cmdStream,
@@ -350,6 +354,7 @@ void App::run() {
ImGui::InputFloat("Object movement speed", &objectVerticalSpeed);
ImGui::InputInt("Camera shutter speed inverse", &cameraShutterSpeedInverse);
+ ImGui::DragFloat("Motion blur min velocity", &motionBlurMinVelocity, 0.01, 0, 1);
ImGui::End();
gui.endGUI();
--
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