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			155 lines
		
	
	
	
		
			3.3 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			155 lines
		
	
	
	
		
			3.3 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
#include "loadland.hpp"
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namespace ESM
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{
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Land::Land()
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    : flags(0)
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    , X(0)
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    , Y(0)
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    , mEsm(NULL)
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    , hasData(false)
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    , dataLoaded(false)
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    , landData(NULL)
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{
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}
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Land::~Land()
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{
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    delete landData;
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}
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void Land::load(ESMReader &esm)
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{
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    mEsm = &esm;
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    // Get the grid location
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    esm.getSubNameIs("INTV");
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    esm.getSubHeaderIs(8);
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    esm.getT<int>(X);
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    esm.getT<int>(Y);
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    esm.getHNT(flags, "DATA");
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    // Store the file position
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    context = esm.getContext();
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    hasData = false;
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    int cnt = 0;
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    // Skip these here. Load the actual data when the cell is loaded.
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    if (esm.isNextSub("VNML"))
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    {
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        esm.skipHSubSize(12675);
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        cnt++;
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    }
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    if (esm.isNextSub("VHGT"))
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    {
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        esm.skipHSubSize(4232);
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        cnt++;
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    }
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    if (esm.isNextSub("WNAM"))
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    {
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        esm.skipHSubSize(81);
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    }
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    if (esm.isNextSub("VCLR"))
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    {
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        esm.skipHSubSize(12675);
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    }
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    if (esm.isNextSub("VTEX"))
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    {
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        esm.skipHSubSize(512);
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        cnt++;
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    }
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    // We need all three of VNML, VHGT and VTEX in order to use the
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    // landscape.
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    hasData = (cnt == 3);
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    dataLoaded = false;
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    landData = NULL;
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}
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void Land::loadData()
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{
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    if (dataLoaded)
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    {
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        return;
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    }
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    landData = new LandData;
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    if (hasData)
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    {
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        mEsm->restoreContext(context);
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        //esm.getHNExact(landData->normals, sizeof(VNML), "VNML");
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        if (mEsm->isNextSub("VNML"))
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        {
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            mEsm->skipHSubSize(12675);
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        }
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        VHGT rawHeights;
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        mEsm->getHNExact(&rawHeights, sizeof(VHGT), "VHGT");
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        int currentHeightOffset = rawHeights.heightOffset;
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        for (int y = 0; y < LAND_SIZE; y++)
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        {
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            currentHeightOffset += rawHeights.heightData[y * LAND_SIZE];
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            landData->heights[y * LAND_SIZE] = currentHeightOffset * HEIGHT_SCALE;
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            int tempOffset = currentHeightOffset;
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            for (int x = 1; x < LAND_SIZE; x++)
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            {
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                tempOffset += rawHeights.heightData[y * LAND_SIZE + x];
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                landData->heights[x + y * LAND_SIZE] = tempOffset * HEIGHT_SCALE;
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            }
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        }
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        if (mEsm->isNextSub("WNAM"))
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        {
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            mEsm->skipHSubSize(81);
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        }
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        if (mEsm->isNextSub("VCLR"))
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        {
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            landData->usingColours = true;
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            mEsm->getHExact(&landData->colours, 3*LAND_NUM_VERTS);
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        }else{
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            landData->usingColours = false;
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        }
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        //TODO fix magic numbers
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        uint16_t vtex[512];
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        mEsm->getHNExact(&vtex, 512, "VTEX");
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        int readPos = 0; //bit ugly, but it works
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        for ( int y1 = 0; y1 < 4; y1++ )
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            for ( int x1 = 0; x1 < 4; x1++ )
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                for ( int y2 = 0; y2 < 4; y2++)
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                    for ( int x2 = 0; x2 < 4; x2++ )
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                        landData->textures[(y1*4+y2)*16+(x1*4+x2)] = vtex[readPos++];
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    }
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    else
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    {
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        landData->usingColours = false;
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        memset(&landData->textures, 0, 512 * sizeof(uint16_t));
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        for (int i = 0; i < LAND_NUM_VERTS; i++)
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        {
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            landData->heights[i] = -256.0f * HEIGHT_SCALE;
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        }
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    }
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    dataLoaded = true;
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}
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void Land::unloadData()
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{
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    if (dataLoaded)
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    {
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        delete landData;
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        landData = NULL;
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        dataLoaded = false;
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    }
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}
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}
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