A user-programmable vertex engine

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1. What are the contributions mentioned in the paper "A user-programmable vertex engine" ?

2. What have the authors stated for future works in "A user-programmable vertex engine" ?

3. What have the authors contributed in "A user-programmable vertex engine" ?

4. What are the future works in "A user-programmable vertex engine" ?

Accepted Answer

In this paper the authors describe the design, programming interface, and implementation of a very efficient user-programmable vertex engine.. Embedded in the broader fixed function pipeline, their approach preserves parallelism sacrificed by previous approaches.. The programmer is presented with a straightforward programming model, which is supported by transparent multi-threading and bypassing to preserve parallelism and performance.. In the remainder of the paper the authors discuss the motivation behind their design and contrast it with previous work.. The authors present the programming model, the instruction set selection process, and details of the hardware implementation.. Finally, the authors discuss important API design issues encountered when creating an interface to such a device.

Accepted Answer

Their future work will focus on increased programmability of geometry processing, and programmable fragment processing.

Accepted Answer

In this paper the authors describe the design, programming interface, and implementation of a very efficient user-programmable vertex engine.. Embedded in the broader fixed function pipeline, their approach preserves parallelism sacrificed by previous approaches.. The programmer is presented with a straightforward programming model, which is supported by transparent multi-threading and bypassing to preserve parallelism and performance.. In the remainder of the paper the authors discuss the motivation behind their design and contrast it with previous work.. The authors present the programming model, the instruction set selection process, and details of the hardware implementation.. Finally, the authors discuss important API design issues encountered when creating an interface to such a device.

Accepted Answer

Their future work will focus on increased programmability of geometry processing, and programmable fragment processing.

Accepted Answer

Tasks such as vertex load&store, format conversion, primitive assembly, clipping, and triangle setup occur completely in parallel, in pipeline fashion.

Accepted Answer

To hold constants such as matrices, light positions, and plane coefficients that are used in typical vertex programs, there is a memory bank of 96 quad-floats.

Accepted Answer

When disabled, vertices are transformed by OpenGL’s conventional vertex-processing functionality, consisting of coordinate transformation, vertex lighting, texture coordinate generation, and user-defined clip planes.

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The texture subsystem can fetch a normal from a 2D texture encoding tangent-space normals (a normal map) [21], expand the normal to floating-point, and rotate the normal using a 3x3 floating-point matrix supplied via interpolated texture coordinates.

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the rotated normal vector and a view vector supplied as an interpolated texture coordinate vector feed the computation of a reflection vector (without requiring either normalized view or normal vectors [28]).

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The program may not write to constants because it would create a dependency between vertices, forcing serialization causing a serious performance impact.

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The surface engine can tessellate a Bézier patch and also generate per-vertex texture coordinates and surface gradients derived from the surface's bivariate parameterization.

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The 3x3 matrix and vector are combined into a 4x3 matrix that is output as texture coordinates for use by the properly configured texturing engine.

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At vertex program completion, the vertex result registers contain a transformed vertex that is further processed to screen space and forwarded to primitive assembly.

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The authors support dot products for their coding convenience, and also because as the number of cycles spent on a vertex decreases over architectural generations, it becomes more important to have powerful concise instructions.

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It was critical to deal efficiently with scalar packing/extraction and vector data in this design since the 3D transform pipeline mixes these operations.

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IEEE single precision floating point has been used for many years as the standard precision for 3D transformations and to keep the model simple it was adopted as the only data type.

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The authors chose an independent vertex program model to exploit the parallel nature of the task, and greatly simplify the resulting programming task.

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The strictness of the vertex program grammar and semantic restrictions ensures that programs will operate as expected and that the complete hardware implementation of vertex programs is tractable.

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Vertex attribute aliasing also facilitates forward focus because the 16 vertex attributes can be used without regard to any conventional usage for these attributes.

Accepted Answer

Vertex attribute aliasing facilitates ease of adoption because existing OpenGL programs that supply per-vertex data via OpenGL’s conventional vertex parameters may still take advantage of vertex programs with fairly minor changes.

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The authors consider the notion of program objects with different targets to be forward-looking because future OpenGL extensions can use the same interface for managing programmability.

Accepted Answer

By not constraining programmable geometry to existing conventions, the authors hope this will encourage novel applications for programmable geometry, including automatic generation of vertex programs by higher-level software [22].

Accepted Answer

Vertex and texture loading overhead in applicationstypically dwarfs the overhead involved in string parsing for vertex program loading.

A user-programmable vertex engine

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Most frequently asked questions

1. What are the contributions mentioned in the paper "A user-programmable vertex engine" ?

2. What have the authors stated for future works in "A user-programmable vertex engine" ?

3. What have the authors contributed in "A user-programmable vertex engine" ?

4. What are the future works in "A user-programmable vertex engine" ?

5. What are the tasks that occur in parallel?

6. How many quad-floats are used to hold constants?

7. What is the function that is used to transform vertex programs?

8. How does the texture subsystem tessellate a normal?

9. What is the function that feeds the computation of a reflection vector?

10. Why is the program not allowed to write to constants?

11. What is the surface engine's ability to tessellate a Bézier patch?

12. What is the function that is used to compute the texture coordinates?

13. What is the function that is used to process vertex program results?

14. Why dot products have a more powerful concise instruction set?

15. What was the main advantage of the 3D transform pipeline?

16. What is the main advantage of the IEEE single precision floating point?

17. Why did the authors choose an independent vertex program model?

18. What is the strictness of the vertex program grammar and semantic restrictions?

19. What is the purpose of vertex attribute aliasing?

20. What is the reason why vertex attribute aliasing is preferred?

21. Why do the authors consider vertex programs to be forward-looking?

22. What is the main reason for not constraining programmable geometry to existing conventions?

23. What is the overhead of a vertex program?

Figures

Citations

A Survey of General-Purpose Computation on Graphics Hardware.

NVIDIA Tesla: A Unified Graphics and Computing Architecture

Brook for GPUs: stream computing on graphics hardware

Optimizing NUCA Organizations and Wiring Alternatives for Large Caches with CACTI 6.0

Linear algebra operators for GPU implementation of numerical algorithms

References

A personal communication

Pixel-planes 5: a heterogeneous multiprocessor graphics system using processor-enhanced memories

PixelFlow: high-speed rendering using image composition

Reality Engine graphics

High-performance polygon rendering

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