Function GetSkyTexture

source/core/textures/skytexture.cpp:45–84

#include "texinfo.h"

FGameTexture* GetSkyTexture(FTextureID baseid, int lognumtiles, const int16_t *tilemap, int remap)
{
	FString synthname;


	if ((lognumtiles == 0 && remap == 0) || lognumtiles > 4 || lognumtiles < 0) 
	{
		// no special handling - let the old code do its job as-is
		return nullptr;
	}

	int numtiles = 1 << lognumtiles;
	synthname.Format("Sky%04x%02x", baseid.GetIndex(), remap);
	for(int i = 0; i < numtiles; i++)
	{
		synthname += 'A' + tilemap[i];
	};
	auto tex = TexMan.FindGameTexture(synthname.GetChars());
	if (tex) return tex;
	auto basetex = TexMan.GetGameTexture(baseid);
	auto scalex = basetex->GetScaleX();
	auto scaley = basetex->GetScaleY();

	TArray<TexPartBuild> build(numtiles, true);
	int tilewidth = basetex->GetTexelWidth();
	for(int i = 0; i < numtiles; i++)
	{
		// Todo - allow named textures for the single patches
		auto texture = TexMan.GameByIndex(baseid.GetIndex() + tilemap[i]);
		if (!texture || !texture->isValid() || texture->GetTexture() == 0) return nullptr;
		build[i].TexImage = static_cast<FImageTexture*>(texture->GetTexture());
		build[i].OriginX = tilewidth * i;
		build[i].Translation = GPalette.GetTranslation(GetTranslationType(remap), GetTranslationIndex(remap));
	}
	auto tt = MakeGameTexture(new FImageTexture(new FMultiPatchTexture(tilewidth*numtiles, basetex->GetTexelHeight(), build, false, false)), synthname.GetChars(), ETextureType::Override);
	tt->SetScale(scalex, scaley);
	tt->SetUpscaleFlag(basetex->GetUpscaleFlag(), true);
	TexMan.AddGameTexture(tt, true);
	return tt;
}