From 891fb65daaa25e28c6d7f4b87aaf68a338666aaa Mon Sep 17 00:00:00 2001
From: Mathias Agopian <mathias@google.com>
Date: Thu, 1 Apr 2021 18:30:12 -0700
Subject: [PATCH] added a slider to debug dynamic scaling issues

This is a big hackish, but is intended to help us debug scaling issues,
this adds a couple of sliders under [Debug] to control dynamic
scaling manually.
---
 samples/gltf_viewer.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/samples/gltf_viewer.cpp b/samples/gltf_viewer.cpp
index 6d48bae093..d70c99848f 100644
--- a/samples/gltf_viewer.cpp
+++ b/samples/gltf_viewer.cpp
@@ -341,6 +341,9 @@ static LinearColor inverseTonemapSRGB(sRGBColor x) {
     return (x * -0.155) / (x - 1.019);
 }
 
+static float sGlobalScale = 1.0f;
+static float sGlobalScaleAnamorphism = 0.0f;
+
 int main(int argc, char** argv) {
     App app;
 
@@ -567,6 +570,8 @@ int main(int argc, char** argv) {
                         debug.getPropertyAddress<bool>("d.renderer.doFrameCapture");
                     *captureFrame = true;
                 }
+                ImGui::SliderFloat("scale", &sGlobalScale, 0.25f, 1.0f);
+                ImGui::SliderFloat("anamorphism", &sGlobalScaleAnamorphism, -1.0f, 1.0f);
             }
 
             if (ImGui::BeginPopupModal("MessageBox", NULL, ImGuiWindowFlags_AlwaysAutoResize)) {
@@ -679,6 +684,22 @@ int main(int argc, char** argv) {
         } else {
             view->setColorGrading(nullptr);
         }
+
+        view->setDynamicResolutionOptions({
+                .minScale = {
+                        lerp(sGlobalScale, 1.0f,
+                                sGlobalScaleAnamorphism >= 0.0f ? sGlobalScaleAnamorphism : 0.0f),
+                        lerp(sGlobalScale, 1.0f,
+                                sGlobalScaleAnamorphism <= 0.0f ? -sGlobalScaleAnamorphism : 0.0f),
+                },
+                .maxScale = {
+                        lerp(sGlobalScale, 1.0f,
+                                sGlobalScaleAnamorphism >= 0.0f ? sGlobalScaleAnamorphism : 0.0f),
+                        lerp(sGlobalScale, 1.0f,
+                                sGlobalScaleAnamorphism <= 0.0f ? -sGlobalScaleAnamorphism : 0.0f),
+                },
+                .enabled = sGlobalScale != 1.0f,
+        });
     };
 
     auto postRender = [&app](Engine* engine, View* view, Scene* scene, Renderer* renderer) {