LPGPU.org

Today Samsung has uploaded videos for 7 of their Vulkan test apps. Find out more about each one, including why it was written the way it was, and what we hope the LPGPU2 tool will identify when analysing them:

The LPGPU2 Vulkan Raymarching test app is designed to test the LPGPU2 profiling tool’s ability to analyse GPU compute-bound scenarios. All of the work for this app is confined to the fragment shader, which involves a computationally expensive loop detecting the distance a ray travels into the scene before colliding with geometry.

The LPGPU2 Vulkan Overdraw App displays a stack of translucent sheets that span almost the entire display area. The stack can be drawn either front to back or back to front. Can the LPGPU2 profiling tool detect a difference between these scenarios, and what are the implications of having many pixels repeatedly overdrawn?

The LPGPU2 Vulkan OverdrawTex App is geometrically identical to the Overdraw App – it displays a stack of translucent sheets that span the display area. The difference is that instead of colouring the triangle with a simple interpolation between values, a texture lookup is invoked. What happens when many more texture lookups are issued than there are pixels? Can the LPGPU2 profiling tool recognise this scenario?

The LPGPU2 Vulkan Menger Sponge app has a variable amount of geometry and a variable amount of detail on that geometry. The detail is implemented through a multi-level fragment shader algorithm. The result is an app that has a tuneable volume of geometry and independently tuneable compute burden.

The LPGPU2 Vulkan Hypercube app displays a representation of a 4D hypercube as it tumbles about the three most interesting planes of a 4D space. The scene contains a small amount of geometry and uses almost trivial shaders. The app is designed to have a low graphics overhead to find out what the LPGPU2 profiling tool reports in that situation.

The LPGPU2 Vulkan Globe app simulates a cloud-covered earth spinning in a starry sky. The number of cloud layers is variable, resulting in an app that specifically stresses the texture capabilities of the GPU.

The LPGPU2 Vulkan Uber app is the ‘kitchen sink’ of tests with its high levels of geometry, many textures, and heavy fragment- and vertex-processing, resulting in a low frame rate and very slow start-up time. Can the LPGPU2 profiling tool pick it apart?