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https://github.com/ZDoom/gzdoom.git
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155 lines
4.9 KiB
C++
155 lines
4.9 KiB
C++
// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// $Id:$
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//
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// Copyright (C) 1993-1996 by id Software, Inc.
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//
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// This source is available for distribution and/or modification
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// only under the terms of the DOOM Source Code License as
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// published by id Software. All rights reserved.
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//
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// The source is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
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// for more details.
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//
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// $Log:$
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//
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// DESCRIPTION:
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// Sky rendering. The DOOM sky is a texture map like any
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// wall, wrapping around. 1024 columns equal 360 degrees.
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// The default sky map is 256 columns and repeats 4 times
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// on a 320 screen.
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//
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//
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//-----------------------------------------------------------------------------
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// Needed for FRACUNIT.
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#include "m_fixed.h"
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#include "c_cvars.h"
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#include "g_level.h"
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#include "r_sky.h"
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#include "r_utility.h"
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#include "v_text.h"
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#include "gi.h"
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//
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// sky mapping
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//
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FTextureID skyflatnum;
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FTextureID sky1texture, sky2texture;
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fixed_t skytexturemid;
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fixed_t skyscale;
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fixed_t skyiscale;
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bool skystretch;
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fixed_t sky1cyl, sky2cyl;
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double sky1pos, sky2pos;
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// [RH] Stretch sky texture if not taller than 128 pixels?
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CUSTOM_CVAR (Bool, r_stretchsky, true, CVAR_ARCHIVE)
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{
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R_InitSkyMap ();
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}
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fixed_t freelookviewheight;
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//==========================================================================
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//
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// R_InitSkyMap
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//
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// Called whenever the view size changes.
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//
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//==========================================================================
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void R_InitSkyMap ()
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{
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int skyheight;
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FTexture *skytex1, *skytex2;
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skytex1 = TexMan[sky1texture];
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skytex2 = TexMan[sky2texture];
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if (skytex1 == NULL)
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return;
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if ((level.flags & LEVEL_DOUBLESKY) && skytex1->GetHeight() != skytex2->GetHeight())
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{
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Printf (TEXTCOLOR_BOLD "Both sky textures must be the same height." TEXTCOLOR_NORMAL "\n");
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sky2texture = sky1texture;
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}
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// There are various combinations for sky rendering depending on how tall the sky is:
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// h < 128: Unstretched and tiled, centered on horizon
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// 128 <= h < 200: Can possibly be stretched. When unstretched, the baseline is
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// 28 rows below the horizon so that the top of the texture
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// aligns with the top of the screen when looking straight ahead.
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// When stretched, it is scaled to 228 pixels with the baseline
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// in the same location as an unstretched 128-tall sky, so the top
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// of the texture aligns with the top of the screen when looking
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// fully up.
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// h == 200: Unstretched, baseline is on horizon, and top is at the top of
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// the screen when looking fully up.
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// h > 200: Unstretched, but the baseline is shifted down so that the top
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// of the texture is at the top of the screen when looking fully up.
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skyheight = skytex1->GetScaledHeight();
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skystretch = false;
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skytexturemid = 0;
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if (skyheight >= 128 && skyheight < 200)
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{
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skystretch = (r_stretchsky
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&& skyheight >= 128
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&& level.IsFreelookAllowed()
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&& !(level.flags & LEVEL_FORCENOSKYSTRETCH)) ? 1 : 0;
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skytexturemid = -28*FRACUNIT;
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}
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else if (skyheight > 200)
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{
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skytexturemid = (200 - skyheight) << FRACBITS;
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}
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skytexturemid = FixedMul(skytexturemid, skytex1->yScale);
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if (viewwidth != 0 && viewheight != 0)
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{
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skyiscale = (r_Yaspect*FRACUNIT) / ((freelookviewheight * viewwidth) / viewwidth);
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skyscale = (((freelookviewheight * viewwidth) / viewwidth) << FRACBITS) /
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(r_Yaspect);
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skyiscale = Scale (skyiscale, FieldOfView, 2048);
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skyscale = Scale (skyscale, 2048, FieldOfView);
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}
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if (skystretch)
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{
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skyscale = Scale(skyscale, SKYSTRETCH_HEIGHT, skyheight);
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skyiscale = Scale(skyiscale, skyheight, SKYSTRETCH_HEIGHT);
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skytexturemid = Scale(skytexturemid, skyheight, SKYSTRETCH_HEIGHT);
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}
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// The standard Doom sky texture is 256 pixels wide, repeated 4 times over 360 degrees,
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// giving a total sky width of 1024 pixels. So if the sky texture is no wider than 1024,
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// we map it to a cylinder with circumfrence 1024. For larger ones, we use the width of
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// the texture as the cylinder's circumfrence.
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sky1cyl = MAX(skytex1->GetWidth(), skytex1->xScale >> (16 - 10));
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sky2cyl = MAX(skytex2->GetWidth(), skytex2->xScale >> (16 - 10));
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}
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//==========================================================================
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//
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// R_UpdateSky
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//
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// Performs sky scrolling
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//
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//==========================================================================
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void R_UpdateSky (DWORD mstime)
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{
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// Scroll the sky
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double ms = (double)mstime * FRACUNIT;
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sky1pos = ms * level.skyspeed1;
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sky2pos = ms * level.skyspeed2;
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}
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