By Theoharis Theoharis
This publication is the results of the study within the implementation of polygon-based pics operations on yes normal function parallel processors; the purpose is to supply a speed-up over sequential implementations of the photographs operations involved, and the ensuing software program could be considered as a subset of the applying suites of the suitable parallel machines. A literature overview and a quick description of the architectures thought of supply an creation into the sector. so much algorithms are regularly awarded in an informally outlined extension of the Occam language consisting of unmarried guide a number of info circulation (SIMD) information forms and operations on them. unique equipment for polygon rendering - together with the operations of filling, hidden floor removing and tender shading - are provided for SIMD architectures just like the DAP and for a dual-paradigm (SIMD-MIMD) computer 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 awarded within the e-book and the important literature survey, the reader may also anticipate to achieve an perception into the programming of the appropriate parallel machines.
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Extra info for Algorithms for Parallel Polygon Rendering
R+tlog2(21og2N+w-1)J+l Thus the bits deep. 4). Therefore the evaluation accurate arithmetic example, then the number (w may be the number of representation if I--512, N = 3 2 bit representation is required. 4. 1. 6. e. The method is applicable to convex polygons that occupy an a region in which any pixel can be reached from any other by a sequence of any of the eight one-pixel vertical, horizontal or diagonal moves. Given the U O V E t L M A S K for a particular RW, it is usually possible to decide whether its neighbouring windows are RW's by inspecting the appropriate boundary of the C O V E R .
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. connected together and Occam allows one to construct [INMO84, Transput~rs can parallel programs with relative ease, The transputer is a 32-bit microprocessor with on-chip local memory and 4 bidirectional bit-serial links which enable it to be connected to 4 other transputers in order to construct a loosely-coupled MIMD system.
Ll) stand minimum and maximum y coordinates respectively. y). y). that row. The RW's to the left of the initial RW are then processed (processing stops when the left boundary of COVEtLMASK the for an RW does not contain any TRUE elements). Notice that in order to incrementally calculate the values of linear function F ~ for the left neighbour of a window we subtract, rather than add, the horizontal increment Hi. The RW's to the right of the initial window are processed in a similar manner. MASK contains at least one TRUE element in its top boundary are saved because the top neighbour of that RW will be the initial window of the above increments to row.