qzdoom/src/swrenderer/things/r_voxel.h

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/*
** Voxel rendering
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** Copyright (c) 1998-2016 Randy Heit
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** Copyright (c) 2016 Magnus Norddahl
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any damages
** arising from the use of this software.
**
** Permission is granted to anyone to use this software for any purpose,
** including commercial applications, and to alter it and redistribute it
** freely, subject to the following restrictions:
**
** 1. The origin of this software must not be misrepresented; you must not
** claim that you wrote the original software. If you use this software
** in a product, an acknowledgment in the product documentation would be
** appreciated but is not required.
** 2. Altered source versions must be plainly marked as such, and must not be
** misrepresented as being the original software.
** 3. This notice may not be removed or altered from any source distribution.
**
*/
#pragma once
struct kvxslab_t;
struct FVoxelMipLevel;
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namespace swrenderer
{
struct vissprite_t;
enum { DVF_OFFSCREEN = 1, DVF_SPANSONLY = 2, DVF_MIRRORED = 4 };
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void R_DrawVisVoxel(vissprite_t *sprite, int minZ, int maxZ, short *cliptop, short *clipbottom);
void R_FillBox(DVector3 origin, double extentX, double extentY, int color, short *cliptop, short *clipbottom, bool viewspace, bool pixelstretch);
kvxslab_t *R_GetSlabStart(const FVoxelMipLevel &mip, int x, int y);
kvxslab_t *R_GetSlabEnd(const FVoxelMipLevel &mip, int x, int y);
kvxslab_t *R_NextSlab(kvxslab_t *slab);
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void R_CheckOffscreenBuffer(int width, int height, bool spansonly);
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void R_DeinitRenderVoxel();
// [RH] A c-buffer. Used for keeping track of offscreen voxel spans.
struct FCoverageBuffer
{
struct Span
{
Span *NextSpan;
short Start, Stop;
};
FCoverageBuffer(int size);
~FCoverageBuffer();
void Clear();
void InsertSpan(int listnum, int start, int stop);
Span *AllocSpan();
FMemArena SpanArena;
Span **Spans; // [0..NumLists-1] span lists
Span *FreeSpans;
unsigned int NumLists;
};
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}