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readme.md

Code for the rendering order optimization tools and experiments to go with the paper Revisiting The Vertex Cache: Understanding and Optimizing Vertex Processing on the modern GPU.

The project consists of a main sceneprocessor application, a separate vertex cache test utility, a visualizer application, and various scripts to run experiments. The sceneprocessor application reads triangle meshes from Wavefront .obj files and applies various kinds of processing before writing out the resulting triangle mesh either to another .obj file or to the custom .scene format used by other tools in this project.

Note: The project does contain quite a few components not mentioned in this readme. If a component is not explicitly mentioned here, the reason for this is most likely that the component in question is not currently in an operational state.

How to build

Only Windows 10 (64-Bit) is currently supported. Building the project requires

  • Visual Studio 2017 (15.7+),
  • Windows SDK 10.0.17763.0,
  • Python 3.6+.

To initialize the build system and build dependencies, run setup.py from a Visual Studio 2017 Command Prompt. Once this is done, you can open sceneprocessor/build/vs2017/sceneprocessor.sln and visualizer/build/vs2017/visualizer.sln. The project relies on a few libraries, including boost (for a Fibonacci Heap implementation), and AMD Tootle and DirectXMesh (for implementations of various common vertex cache optimization algorithms). All necessary dependencies are included in the build/dependencies subdirectories of the respective subprojects.

Sceneprocessor

The sceneprocessor utility reads a triangle mesh from the given source file and applies a sequence of operations defined by layers. A layer can perform a simple geometric or topological modification on the mesh, simply compute and print some statistics, write results to a new mesh file, or, most importantly, implement a particular triangle order optimization. The operations to carry out are specified via command line arguments as follows:

sceneconverter [-o <target-file>] [{[-t] -p <processing-layer>}] <source-file>

-p adds a processing layer of the given type. -t adds a timing layer (prints time elapsed since processing reached the previous timing layer or the start of the program). -o adds a terminating output layer which will write the resulting mesh to the specified file.

Effectively, the command line represents a pipeline where data flows through a stack of layers from right to left. The last, rightmost argument specifies the input file; the first, leftmost argument can specify an optional output file. Arguments in between specify processing layers or points where a timestamp should be taken. Supported processing layers:

  • basic mesh operations
    • zflip flip z-axis
    • woflip flip triangle winding order
    • weld deduplicate vertices
    • unweld duplicate vertices
  • triangle order
    • randi randomize order of triangles
    • hoppe<N> optimization method by Hoppe [1999] for cache size <N>
    • linyu<N> optimization method by Lin and Yu [2006] for cache size <N>
    • tipsify<N> optimization method by Sander et. al [2007] for cache size <N>
    • tomf optimization method by Tom Forsyth [2006]
    • mtomf modified version of tomf which resets vertex scores after 96 indices
    • sbatch batch-based optimization
    • ssbatch batch-based optimization
    • dbatch batch-based optimization
    • gbatch batch-based optimization
    • gbatchND batch-based optimization
    • gbatch.intel batch-based optimization
    • gbatchND.intel batch-based optimization
    • gbatch.amd batch-based optimization
    • gbatchND.amd batch-based optimization
  • statistics
    • vcs print vertex reuse statistics
    • ccachesim<N> central vertex cache simulation for cache size <N>
    • LRUcachesim<N> LRU vertex cache simulation for cache size <N>
    • vcachesim vertex cache simulation
    • enumbatch

For example, the command line

sceneconverter -o bunny.scene -p vcs -t -p tomf -t -p randi -p vcs bunny.obj

would read the file bunny.obj, compute and print the vertex reuse statistics for the input file, randomize the order of triangles, print the time elapsed since the start of the program, perform triangle order optimization using the algorithm by Tom Forsyth, print the time elapsed since the last time the time was printed (effectively the time it took to run the optimization algorithm), compute and print the vertex reuse statistics of the optimized mesh, and finally output the optimized mesh to bunny.scene.

Vertex Cache Test

The vertex cache test utility is a separate project, residing in its own repository. It is included in this project as a Git submodule. For more detail, consult the readme located in the respective repository.

Visualizer

The visualizer application is used to display various visualizations illustrating the behavior of vertex cache optimization algorithms on a given mesh. The visualizations are based on information about how many times a given vertex was shaded and sets of vertices that were processed as a group. This kind of information is generated by other tools part of this project and stored in .vsi files (see the vertex cache test project for details on the file format). To start the visualizer application:

visualizer [-screen <screenshot-name>] [--prediction <vsi-file>] [--info <vsi-file>] <scene-file>

At least an argument specifying the .scene file to display is required. The --info and --prediction options can be used to specify .vsi files that contain the vertex processing statistics to visualize. --info specifies the base data set, --prediction can specify an additional data set to compare to. Instead of the name of a .vsi file, each option may alternatively specify the path of a directory. When given the path of a directory, the program will look for a .vsi file of the same name as the scene being used in the given directory. If no .vsi file is specified, the program will look for a .vsi file in the directory of the scene file. The -screen option can be used to save a screenshot to a file of the given name.

Controls

  • left mouse: drag to turn camera
  • middle mouse: drag to pan camera
  • right mouse: drag to zoom
  • [Backspace] reset camera
  • [Tab] cycle through different visualizations
  • [F8] take screenshot
  • [T] toggle triangle order curve
  • [S] toggle batch silhouettes
  • [W] toggle wireframe
  • [B] toggle single batch mode
  • [⇦][⇨] change focus batch
  • [⇧][⇩] change focus batch (larger increment)

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