By Theoharis Theoharis
This booklet is the results of the learn within the implementation of polygon-based photos operations on yes normal objective parallel processors; the purpose is to supply a speed-up over sequential implementations of the portraits operations involved, and the ensuing software program will be seen as a subset of the applying suites of the suitable parallel machines. A literature evaluate and a short description of the architectures thought of supply an creation into the sphere. so much algorithms are continuously provided in an informally outlined extension of the Occam language together with unmarried guide a number of facts circulation (SIMD) information kinds and operations on them. unique equipment for polygon rendering - together with the operations of filling, hidden floor removing and gentle shading - are offered for SIMD architectures just like the DAP and for a dual-paradigm (SIMD-MIMD) laptop developed 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 knowledge awarded within the publication and the worthwhile literature survey, the reader may also anticipate to realize an perception into the programming of the appropriate parallel machines.
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Extra info for Algorithms for Parallel Polygon Rendering
The planar object or by altering the The latter method has no array cycle The former one will cost as much as a planar copy. Shifting across word boundaries, planar word 8hilt, directions; UP, DOWN, LEFT or RIGHT. A:= AUP7 can be done For example the statement: in one of four $I will shift each scalar element of A from shifting involves inter-PE communication takes place synchronously PE (i,j) to PE for all PE's (notice that the wrap-around processor array are used in planar word shifting). 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.
To divide co-planar the polygon until we or we reach the triangle. obtain subpolygons whose colour space vertices are This division should be performed separately for each 50 colour component and could be achieved, for example, by the MIMD network of the Disputer. 2. To closely employ related an to approximation the (non technique in order co-planar) colour to derive a plane space vertices of the technique has been waggested by Newelt and is described in [Suth74a]. vertices of the polygon. The and a,b c coefficients of the X Y R equation that polygon.
W o r d - v e r s u s B i t - P a r a l l e l i s m It is interesting to understand why the above difference arises between the performances of the above two processor arrays which use the same amount of silicon. Both processor arrays can perform the incremental evaluation of the linear function equally efficiently (the 32)<32 processor array takes 80 cycles to incrementally evaluate the linear function over a 32x32 grid, and the 8xSx16 processor array also requires 16"5 incremental evaluation of the linear function over the same grid).
Algorithms for Parallel Polygon Rendering by Theoharis Theoharis