PowerVR Graphics SDK tools explained: PVRTraceGUI basics

PVRTraceGUI makes OpenGL ES debugging easy. In this post, I’ll detail the core features of the tool and explain how they can be used to optimize and debug the API calls made by your application.

The Call List


The ‘Call List’ is the core of PVRTraceGUI – it allows you to see how the graphics API was used during recording. The buttons along the top of this widget allow you to collapse the view to draw calls only, configure and apply a filter to hide specific calls, or search for a call name, parameter value or any other string tracked by the tool. Right click options allow you to quickly apply a filter or highlight to the selected call, or open the documentation for the function in your web browser.


Frame Statistics

This widget gives a high-level overview of how much data has been submitted to the graphics driver in the selected frame. ‘Frame Summary’ shows the number of triangles, texture uploads, etc. that have been submitted, and the ‘Calls Summary’ lists the number of API calls that have been made (from most called to least called).


This data makes it easy to identify calls that are erroneously made too often (for example, redundantly calling glGetError() hundreds of times per-frame in release builds).


PVRTrace_States States -> State

This tab shows the active renderstate for the currently selected function. Red text indicates that the renderstate has changed since the previous draw call.

Paired with stepping through draw calls in the ‘Image Analysis’ window, the data in this tab makes the process of hunting down incorrect bindings (textures, FBOs, VBOs etc.) and states trivial.

States -> Textures

This tab lists all textures that were captured during recording. Each texture is paired with a thumbnail preview and some information about it, such as resolution, texture format, etc. Clicking on a texture gives it focus in the ‘Data Viewer’ widget.

States ->Shaders

All captured shaders are listed by the shader program they are used in. Clicking on a shader gives it focus in the ‘Data Viewer’ widget.

Data Viewer


The ‘Data Viewer’ allows you to inspect captured data, such as textures and shaders. The Shaders tab integrates PVRShaderEditor for full syntax highlighting and per-line cycle count estimates.

The ‘Pixel Analysis’ tab displays stats and graphs that highlight the most expensive shaders in your render so you know exactly where you should focus your optimization (I’ll cover this in more detail in the next post).

Image Analysis


This widget allows you to play back entire frames, ranges of draw calls or individual draws. The frame scrubber in the bottom-right hand corner of PVRTraceGUI allows you to step or jump between recorded frames.

The drop-down box at the top-left of the widget changes the rendering mode. Available modes are: Normal (standard render), Wireframe, Wireframe (No Shaders), Depth Complexity, PowerVR Depth Complexity (estimation of the GPUs Hidden Surface Removal) and Pixel Heatmap (green-to-red render of the scene to highlight the most costly fragment shaders).


And, finally, we have the Tools widget which includes ‘Search’ results, ‘Output’ (PVRTrace’s log) and ‘Trace Modifications’.


Trace Modifications is particularly interesting – the tab lists any changes you’ve made to the original recording, such as any calls you have disabled or any shaders you have modified. The functionality here is quite extensive, so I’ll cover it in a later post.


This concludes my swift overview of PVRTraceGUI. Please checkout the tool here if you haven’t already done so, contact us on our forum if you have any questions and follow us on Twitter (@ImaginationTech and @PowerVRInsider) to stay in the news on the latest releases from PowerVR and the Developer Technology team.

Leave a Comment

Search by Tag

Search for posts by tag.

Search by Author

Search for posts by one of our authors.

Featured posts
Popular posts

Blog Contact

If you have any enquiries regarding any of our blog posts, please contact:

United Kingdom

Tel: +44 (0)1923 260 511

Related blog articles

What is PowerVR Automotive? Register NOW to hear our webinar.

The automotive industry is going through many changes and that is having a huge impact on the semiconductor IP industry. The vehicle will move from being predominantly mechanical to primarily a computer on wheels enabling a future of self-driving cars,

Image-based lighting

PowerVR Tools and SDK 2018 Release 2 now available

Here’s an early Christmas present for graphics developers – the release of the latest version of our PowerVR Tools and SDK! The headline features for this release include some exciting new examples demonstrating new techniques in our SDK, and some very

on stage in China

PVRIC4 a hit at ICCAD 2018 in China

Imagination’s PVRIC4 image compression tech garnered plenty of attention at the recent ICCAD China 2018 symposium, which took place on 29th and 30th November at the Zhuhai International Convention & Exhibition Centre, China. The annual event focusses on integrated circuit

The ultimate embedded GPUs for the latest applications

Introducing PowerVR Series9XEP, Series9XMP, and Series9XTP As Benjamin Franklin once said, only three things in life are certain: death, taxes and the ongoing rapid advancement of GPUs for embedded applications*. Proving his point, this week, Imagination has once again pushed

Stay up-to-date with Imagination

Sign up to receive the latest news and product updates from Imagination straight to your inbox.

  • This field is for validation purposes and should be left unchanged.