By Theoharis Theoharis
This publication is the results of the examine within the implementation of polygon-based images operations on definite common goal parallel processors; the purpose is to supply a speed-up over sequential implementations of the photos operations involved, and the ensuing software program will be considered as a subset of the appliance suites of the proper parallel machines. A literature assessment and a short description of the architectures thought of provide an creation into the sector. such a lot algorithms are constantly provided in an informally outlined extension of the Occam language including unmarried guide a number of information circulate (SIMD) information kinds and operations on them. unique tools for polygon rendering - together with the operations of filling, hidden floor removing and delicate shading - are provided for SIMD architectures just like the DAP and for a dual-paradigm (SIMD-MIMD) laptop built out of a DAP-like processor array and a transputer community. Polygon clipping algorithms for either transputer and the DAP are defined and contrasted. except the data offered within the booklet and the worthy literature survey, the reader may also anticipate to realize an perception into the programming of the proper parallel machines.
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Extra info for Algorithms for Parallel Polygon Rendering
Main difference from the SIMD model is that every processor has its own controller. D systems and processors. It seems that the main drawbacks of /vlIMD systems were: L The difficulty involved in constructing such systems out of off -the-shelf components and in particular providing efficient communication between processors. 2. The lack of a practical language in which to express the concepts involved in programming a MqMD system. The advent tNMO87] easily be of the provide transputer [INMO86] and its programming language Occam a very promising solution to the above two problems.
A cycles (not memory Planar word connections of the number of "internal" processor array cycles) will be used in order to perform a planar word contents of a planar register. On number (i, (j÷7)modN). but this is cheap on a processor array because it shift on the a processor array with the connectivity of the DAP, the of internal cycles necessary will be equal to the number of positions shifted which will be less than or equal to I/2N. Internal cycles are usually much faster than memory cycles; in the case of the transputer, for example, internal cycles are 4 times faster than external memory The DisArray cycles.
2. 3) can over the area of the Smooth Shading on a Processor plane equation that has to be performed Array in step 4 of the Gouraud shading be implemented by the evaluation of a bivariate linear function the polygon through [Fuch85]. the The required function is derived by calculating XY6'-space vertices of the polygon (where the third component, 6r, is the intensity calculated for each vertex) and solving that equation for 6'. If RGB colour is used then 3 linear functions must be evaluated; one for each of the XYtL XYG and X Y B spaces.
Algorithms for Parallel Polygon Rendering by Theoharis Theoharis