gzdoom-gles/src/swrenderer/plane/r_skyplane.cpp

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//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
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#include <stdlib.h>
#include <float.h>
#include "templates.h"
#include "i_system.h"
#include "w_wad.h"
#include "doomdef.h"
#include "doomstat.h"
#include "r_sky.h"
#include "stats.h"
#include "v_video.h"
#include "a_sharedglobal.h"
#include "c_console.h"
#include "cmdlib.h"
#include "d_net.h"
#include "g_level.h"
#include "swrenderer/scene/r_opaque_pass.h"
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#include "r_skyplane.h"
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#include "swrenderer/scene/r_3dfloors.h"
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#include "v_palette.h"
#include "r_data/colormaps.h"
#include "swrenderer/drawers/r_draw_rgba.h"
#include "gl/dynlights/gl_dynlight.h"
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#include "swrenderer/segments/r_clipsegment.h"
#include "swrenderer/segments/r_drawsegment.h"
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#include "swrenderer/line/r_wallsetup.h"
#include "swrenderer/line/r_walldraw.h"
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#include "swrenderer/scene/r_portal.h"
#include "swrenderer/scene/r_scene.h"
#include "swrenderer/scene/r_viewport.h"
#include "swrenderer/scene/r_light.h"
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#include "swrenderer/r_memory.h"
#include "g_levellocals.h"
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CVAR(Bool, r_linearsky, false, CVAR_ARCHIVE | CVAR_GLOBALCONFIG);
EXTERN_CVAR(Int, r_skymode)
namespace swrenderer
{
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void RenderSkyPlane::Render(VisiblePlane *pl)
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{
FTextureID sky1tex, sky2tex;
double frontdpos = 0, backdpos = 0;
if ((level.flags & LEVEL_SWAPSKIES) && !(level.flags & LEVEL_DOUBLESKY))
{
sky1tex = sky2texture;
}
else
{
sky1tex = sky1texture;
}
sky2tex = sky2texture;
skymid = skytexturemid;
skyangle = ViewAngle.BAMs();
if (pl->picnum == skyflatnum)
{
if (!(pl->sky & PL_SKYFLAT))
{ // use sky1
sky1:
frontskytex = TexMan(sky1tex, true);
if (level.flags & LEVEL_DOUBLESKY)
backskytex = TexMan(sky2tex, true);
else
backskytex = NULL;
skyflip = 0;
frontdpos = sky1pos;
backdpos = sky2pos;
frontcyl = sky1cyl;
backcyl = sky2cyl;
}
else if (pl->sky == PL_SKYFLAT)
{ // use sky2
frontskytex = TexMan(sky2tex, true);
backskytex = NULL;
frontcyl = sky2cyl;
skyflip = 0;
frontdpos = sky2pos;
}
else
{ // MBF's linedef-controlled skies
// Sky Linedef
const line_t *l = &level.lines[(pl->sky & ~PL_SKYFLAT) - 1];
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// Sky transferred from first sidedef
const side_t *s = l->sidedef[0];
int pos;
// Texture comes from upper texture of reference sidedef
// [RH] If swapping skies, then use the lower sidedef
if (level.flags & LEVEL_SWAPSKIES && s->GetTexture(side_t::bottom).isValid())
{
pos = side_t::bottom;
}
else
{
pos = side_t::top;
}
frontskytex = TexMan(s->GetTexture(pos), true);
if (frontskytex == NULL || frontskytex->UseType == FTexture::TEX_Null)
{ // [RH] The blank texture: Use normal sky instead.
goto sky1;
}
backskytex = NULL;
// Horizontal offset is turned into an angle offset,
// to allow sky rotation as well as careful positioning.
// However, the offset is scaled very small, so that it
// allows a long-period of sky rotation.
skyangle += FLOAT2FIXED(s->GetTextureXOffset(pos));
// Vertical offset allows careful sky positioning.
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skymid = s->GetTextureYOffset(pos);
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// We sometimes flip the picture horizontally.
//
// Doom always flipped the picture, so we make it optional,
// to make it easier to use the new feature, while to still
// allow old sky textures to be used.
skyflip = l->args[2] ? 0u : ~0u;
int frontxscale = int(frontskytex->Scale.X * 1024);
frontcyl = MAX(frontskytex->GetWidth(), frontxscale);
if (skystretch)
{
skymid = skymid * frontskytex->GetScaledHeightDouble() / SKYSTRETCH_HEIGHT;
}
}
}
frontpos = int(fmod(frontdpos, sky1cyl * 65536.0));
if (backskytex != NULL)
{
backpos = int(fmod(backdpos, sky2cyl * 65536.0));
}
bool fakefixed = false;
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CameraLight *cameraLight = CameraLight::Instance();
if (cameraLight->fixedcolormap)
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{
drawerargs.SetColorMapLight(cameraLight->fixedcolormap, 0, 0);
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}
else
{
fakefixed = true;
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cameraLight->fixedcolormap = &NormalLight;
drawerargs.SetColorMapLight(cameraLight->fixedcolormap, 0, 0);
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}
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DrawSky(pl);
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if (fakefixed)
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cameraLight->fixedcolormap = nullptr;
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}
void RenderSkyPlane::DrawSkyColumnStripe(int start_x, int y1, int y2, double scale, double texturemid, double yrepeat)
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{
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RenderPortal *renderportal = RenderPortal::Instance();
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uint32_t height = frontskytex->GetHeight();
double uv_stepd = skyiscale * yrepeat;
double v = (texturemid + uv_stepd * (y1 - CenterY + 0.5)) / height;
double v_step = uv_stepd / height;
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uint32_t uv_pos = (uint32_t)(v * 0x01000000);
uint32_t uv_step = (uint32_t)(v_step * 0x01000000);
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int x = start_x;
if (renderportal->MirrorFlags & RF_XFLIP)
x = (viewwidth - x);
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uint32_t ang, angle1, angle2;
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if (r_linearsky)
{
angle_t xangle = (angle_t)((0.5 - x / (double)viewwidth) * FocalTangent * ANGLE_90);
ang = (skyangle + xangle) ^ skyflip;
}
else
{
ang = (skyangle + xtoviewangle[x]) ^ skyflip;
}
angle1 = (uint32_t)((UMulScale16(ang, frontcyl) + frontpos) >> FRACBITS);
angle2 = (uint32_t)((UMulScale16(ang, backcyl) + backpos) >> FRACBITS);
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drawerargs.SetFrontTexture(frontskytex, angle1);
drawerargs.SetBackTexture(backskytex, angle2);
drawerargs.SetTextureVStep(uv_step);
drawerargs.SetTextureVPos(uv_pos);
drawerargs.SetDest(start_x, y1);
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drawerargs.SetCount(y2 - y1);
drawerargs.SetFadeSky(r_skymode == 2 && !(level.flags & LEVEL_FORCETILEDSKY));
drawerargs.SetSolidTop(frontskytex->GetSkyCapColor(false));
drawerargs.SetSolidBottom(frontskytex->GetSkyCapColor(true));
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if (!backskytex)
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drawerargs.DrawSingleSkyColumn();
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else
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drawerargs.DrawDoubleSkyColumn();
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}
void RenderSkyPlane::DrawSkyColumn(int start_x, int y1, int y2)
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{
if (1 << frontskytex->HeightBits == frontskytex->GetHeight())
{
double texturemid = skymid * frontskytex->Scale.Y + frontskytex->GetHeight();
DrawSkyColumnStripe(start_x, y1, y2, frontskytex->Scale.Y, texturemid, frontskytex->Scale.Y);
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}
else
{
double yrepeat = frontskytex->Scale.Y;
double scale = frontskytex->Scale.Y * skyscale;
double iscale = 1 / scale;
short drawheight = short(frontskytex->GetHeight() * scale);
double topfrac = fmod(skymid + iscale * (1 - CenterY), frontskytex->GetHeight());
if (topfrac < 0) topfrac += frontskytex->GetHeight();
double texturemid = topfrac - iscale * (1 - CenterY);
DrawSkyColumnStripe(start_x, y1, y2, scale, texturemid, yrepeat);
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}
}
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void RenderSkyPlane::DrawSky(VisiblePlane *pl)
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{
int x1 = pl->left;
int x2 = pl->right;
short *uwal = (short *)pl->top;
short *dwal = (short *)pl->bottom;
for (int x = x1; x < x2; x++)
{
int y1 = uwal[x];
int y2 = dwal[x];
if (y2 <= y1)
continue;
DrawSkyColumn(x, y1, y2);
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}
}
}