WORD *pGrassIndices,*pDirtIndices,*pSandIndices;
	
	if(grassIndices) if(FAILED(grassIndices->Lock(0,0,(BYTE**)&pGrassIndices,0))) return false;
	if(dirtIndices) if(FAILED(dirtIndices->Lock(0,0,(BYTE**)&pDirtIndices,0))) {
		grassIndices->Unlock();
		return false;
	}
	if(sandIndices) if(FAILED(sandIndices->Lock(0,0,(BYTE**)&pSandIndices,0))) {
		grassIndices->Unlock();
		dirtIndices->Unlock();
		return false;
	}
	
	int position = 0;
	for(int i=0;i<32;i++) {
		for(int j=0;j<32;j++) {
			if(tilelookup[i][j] & GrassID) {
				pGrassIndices[0] = position + 0;
				pGrassIndices[1] = position + 1;
				pGrassIndices[2] = position + 3;
				pGrassIndices[3] = position + 1;
				pGrassIndices[4] = position + 2;
				pGrassIndices[5] = position + 3;
				pGrassIndices += 6;
			}
			if(tilelookup[i][j] & DirtID) {
				pDirtIndices[0] = position + 0;
				pDirtIndices[1] = position + 1;
				pDirtIndices[2] = position + 3;
				pDirtIndices[3] = position + 1;
				pDirtIndices[4] = position + 2;
				pDirtIndices[5] = position + 3;
				pDirtIndices += 6;
			}
			if(tilelookup[i][j] & SandID) {
				pSandIndices[0] = position + 0;
				pSandIndices[1] = position + 1;
				pSandIndices[2] = position + 3;
				pSandIndices[3] = position + 1;
				pSandIndices[4] = position + 2;
				pSandIndices[5] = position + 3;
				pSandIndices += 6;
			}
			position += 4;
		}
	}
	
	if(sandIndices) sandIndices->Unlock();
	if(dirtIndices) dirtIndices->Unlock();
	if(grassIndices) grassIndices->Unlock();

quote:Original post by Osc
The second parameter to Lock should be the size in bytes that you want to lock, ie. 32*32*6*sizeof(WORD) instead of zero ;->

You may be able to lock a smaller region if you''ve already counted how many tiles use each type ( which you need to know anyway when you draw the data ).

quote:Original post by ACAC
Why use a different set of indicies for each sand/dirt/grss when they are exsactly the same? O_o