27 lines
1.1 KiB
Common Lisp
27 lines
1.1 KiB
Common Lisp
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// Copyright 2017 The Servo Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Common functions for all accumulation operations.
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// Determines the boundaries of the column we'll be traversing.
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void get_location(__private uint *lColumn,
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__private uint *lFirstRow,
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__private uint *lLastRow,
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uint4 kAtlasRect,
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uint kAtlasShelfHeight) {
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uint atlasWidth = kAtlasRect.z - kAtlasRect.x, atlasHeight = kAtlasRect.w - kAtlasRect.y;
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uint shelfIndex = get_global_id(0) / atlasWidth;
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*lColumn = get_global_id(0) % atlasWidth;
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*lFirstRow = min(shelfIndex * kAtlasShelfHeight, atlasHeight);
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*lLastRow = min((shelfIndex + 1) * kAtlasShelfHeight, atlasHeight);
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}
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