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Add basic voxel drawing showing how to use the input data structures

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This commit is contained in:
Magnus Norddahl 2016-12-26 05:09:01 +01:00
parent 2901e2d834
commit 100b80143a
2 changed files with 59 additions and 6 deletions
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60
src/r_voxel.cpp
View file

@ -54,20 +54,68 @@ namespace swrenderer
double sprite_yscale = sprite->yscale;
FVoxel *voxel = sprite->voxel;
// To do: calculate the mipmap level based on distance, sprite scale and voxel extents
int miplevel = 0;//voxel->NumMips;
const FVoxelMipLevel &mip = voxel->Mips[miplevel];
if (mip.SlabData == nullptr)
return;
/*
double spriteSin = sprite_angle.Sin();
double spriteCos = sprite_angle.Cos();
double pivotX = (mip.Pivot.X * spriteSin - mip.Pivot.Y * spriteCos);
double pivotY = (mip.Pivot.X * spriteCos + mip.Pivot.Y * spriteSin);
double pivotZ = -mip.Pivot.Z;
*/
R_FillBox(sprite_origin, 5.0 * sprite_xscale, 5.0 * sprite_yscale, 16, cliptop, clipbottom, false, false);
DVector2 dirX(spriteSin * sprite_xscale, -spriteCos * sprite_xscale);
DVector2 dirY(spriteCos * sprite_xscale, spriteSin * sprite_xscale);
float dirZ = -sprite_yscale;
DVector3 voxel_origin = sprite_origin;
voxel_origin.X -= dirX.X * mip.Pivot.X + dirX.Y * mip.Pivot.Y;
voxel_origin.Y -= dirY.X * mip.Pivot.X + dirY.Y * mip.Pivot.Y;
voxel_origin.Z -= dirZ * mip.Pivot.Z;
// To do: do this loop sorted back to front:
for (int x = 0; x < mip.SizeX; x++)
{
for (int y = 0; y < mip.SizeY; y++)
{
kvxslab_t *slab_start = R_GetSlabStart(mip, x, y);
kvxslab_t *slab_end = R_GetSlabEnd(mip, x, y);
for (kvxslab_t *slab = slab_start; slab != slab_end; slab = R_NextSlab(slab))
{
// To do: check slab->backfacecull
for (int i = 0; i < slab->zleng; i++)
{
int z = slab->ztop + i;
uint8_t color = slab->col[i];
DVector3 voxel_pos = voxel_origin;
voxel_pos.X += dirX.X * x + dirX.Y * y;
voxel_pos.Y += dirY.X * x + dirY.Y * y;
voxel_pos.Z += dirZ * z;
R_FillBox(voxel_pos, sprite_xscale, sprite_yscale, color, cliptop, clipbottom, false, false);
}
}
}
}
}
kvxslab_t *R_GetSlabStart(const FVoxelMipLevel &mip, int x, int y)
{
return (kvxslab_t *)&mip.SlabData[mip.OffsetX[x] + (int)mip.OffsetXY[x * (mip.SizeY + 1) + y]];
}
kvxslab_t *R_GetSlabEnd(const FVoxelMipLevel &mip, int x, int y)
{
return R_GetSlabStart(mip, x, y + 1);
}
kvxslab_t *R_NextSlab(kvxslab_t *slab)
{
return (kvxslab_t*)(((uint8_t*)slab) + 3 + slab->zleng);
}
void R_FillBox(DVector3 origin, double extentX, double extentY, int color, short *cliptop, short *clipbottom, bool viewspace, bool pixelstretch)

5
src/r_voxel.h
View file

@ -22,10 +22,15 @@
#pragma once
struct kvxslab_t;
namespace swrenderer
{
struct vissprite_t;
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);
}