40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup render
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*/
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#pragma once
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namespace blender {
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/** Span fill in method, is also used to localize data for Z-buffering. */
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struct ZSpan {
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int rectx, recty; /* range for clipping */
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int miny1, maxy1, miny2, maxy2; /* actual filled in range */
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const float *minp1, *maxp1, *minp2, *maxp2; /* vertex pointers detect min/max range in */
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float *span1, *span2;
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};
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/**
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* Each Z-buffer has coordinates transformed to local rect coordinates, so we can simply clip.
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*/
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void zbuf_alloc_span(struct ZSpan *zspan, int rectx, int recty);
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void zbuf_free_span(struct ZSpan *zspan);
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/**
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* Scan-convert for strand triangles, calls function for each x, y coordinate
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* and gives UV barycentrics and z.
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*/
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void zspan_scanconvert(struct ZSpan *zspan,
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void *handle,
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float *v1,
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float *v2,
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float *v3,
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void (*func)(void *, int, int, float, float));
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} // namespace blender
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