Building the Qt 3D Studio OpenGL Runtime
To configure runtime features you can modify
ogl-runtime\commonplatform.pri file. This file contains defines which turn on / off specific features.
QT3DS_ENABLE_PERF_LOGGING to build runtime with performance logging on. At runtime, to see the logs you should also enable
qt3ds.perf_info category e.g. with
"QT_LOGGING_RULES=qt3ds.perf_info=true". More information about Qt logging categories from https://doc.qt.io/qt-5/qloggingcategory.html
During the application startup console output should then contain following:
qt3ds.perf_info: 1. (1) Application: Begin Load - 1.145900ms = 1.146200ms qt3ds.perf_info: 2. (1) Context: CreateRenderContext - 192.358500ms = 193.522300ms qt3ds.perf_info: 3. (1) Binding: Initial Batch Image Load - 0.003200ms = 193.551800ms qt3ds.perf_info: 4. (1) Binding: Initialize Scenes - 0.000100ms = 193.563500ms qt3ds.perf_info: 5. (1) SceneManager: OnGraphicsInitialized - 0.023800ms = 193.567600ms qt3ds.perf_info: 6. (1) Application: EndLoad - 0.000500ms = 193.574900ms qt3ds.perf_info: 7. (1) Application: GetMetaData - 59.171400ms = 252.875800ms qt3ds.perf_info: 8. (3) BatchLoader: Image Decompression - 15.395400ms = 294.876900ms ... qt3ds.perf_info: 36. (1) Application: NotifyDataOutputs - 0.080800ms = 477.483800ms qt3ds.perf_info: *** First frame rendered *** qt3ds.perf_info: Runtime startup time: 477ms qt3ds.perf_info: Application startup time: 1601ms qt3ds.perf_info: Render Statistics: 33.62fps, frame count 34 qt3ds.perf_info: Render Statistics: 59.92fps, frame count 60 qt3ds.perf_info: Render Statistics: 59.92fps, frame count 60 ...
Log format is:
(n) [task name] - [time] = [cumulative time] where:
(n)= The amount of time
[task name]was run during startup.
[task name]= Method/task being logged.
[time]= How many ms running
(n)times totally takes.
[cumulative time]= How many total ms has passed when the last run of
Note: When analyzing the results, please note that tasks overlap with each other, some tasks include other tasks etc.
Runtime startup time contains the time spent inside runtime methods where
Application startup time contains the whole startup time.
QT3DS_ENABLE_PERF_LOGGING should not be enabled in release builds as logging increases performance overhead.
To optimize the supported shadows and lights amount, you can define QT3DS_MAX_NUM_LIGHTS and QT3DS_MAX_NUM_SHADOWS.
To enable legacy ASTC which means that ASTC files are not loaded until needed for texture creation, define LEGACY_ASTC_LOADING.
To force all ASTC compressed images to be treated as premultiplied, you can enable this. Alternatively if you want to do this at runtime, set QT3DS_ALL_ASTC_PREMULTIPLIED as an environment variable.
Available under certain Qt licenses.
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