363dfcffbd
- Improved sky stretching a bit: It now only stretches the sky as tall as it needs to be: 228 pixels, not 256. It no longer stretches horizontally, either. The reason it stretches to 228 and not 200 pixels is because Doom shifted its sky texture down 28 pixels. By stretching to 228 pixels, we can keep the sky tiled at the same height on the horizon. Skies 200 pixels tall (or more) will continue to tile at the center of the screen when looking directly ahead. SVN r1976 (trunk)
132 lines
3.9 KiB
C++
132 lines
3.9 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 "r_data.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_main.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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extern 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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// Skies between [128,200) are stretched to 200 pixels. Shorter skies do
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// not stretch because it is assumed they are meant to tile, and taller
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// skies do not stretch because they provide enough information for no
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// repetition when looking all the way up.
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skyheight = skytex1->GetScaledHeight();
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if (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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// The sky is shifted down from center so that it is entirely visible
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// when looking straight ahead.
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skytexturemid = -28*FRACUNIT;
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}
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else
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{
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// The sky is directly centered so that it is entirely visible when
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// looking fully up.
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skytexturemid = 0;
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skystretch = false;
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}
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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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