How do you handle multiple textures in directX

Q_Ball

I think this belongs here more than on the graphics board.

I have a box, defined by _lowerBound and _upperBound vectors which is essentially a room. I have to use two textures, one for the floor and ceiling and one for the 4 walls. The problem i have is that all the faces are being textured with the one texture because i am unsure where to put the second setTexture call. here's the setup method

bool World::setup(IDirect3DDevice9 * device)
{
	bool success;
	// Call the superclass setup
	success = DrawableEntity::setup(device);

	if (success) 
	{			
		TexelVertex * vertices;
		
		// Create a vertex buffer to hold the vertices we want to draw
		device->CreateVertexBuffer(
			36 * sizeof(TexelVertex), // size in bytes
			D3DUSAGE_WRITEONLY,		  // flags
			TexelVertex::FVF,         // vertex format
			D3DPOOL_MANAGED,		  // managed memory pool
			&_boxVertices,            // return create vertex buffer
			0);     

		_boxVertices->Lock(0, 0, (void**)&vertices, 0);

			//ceiling
			vertices[0] = TexelVertex(80, 15, -50, 1, 0);
			vertices[1] = TexelVertex(80, 15, 50, 1, 1);
			vertices[2] = TexelVertex(-80, 15, 50, 0, 1);

			vertices[3] = TexelVertex(-80, 15, 50, 0, 1);
			vertices[4] = TexelVertex(-80, 15, -50, 0, 0);
			vertices[5] = TexelVertex(80, 15, -50, 1, 0);

			//floor
			vertices[6] = TexelVertex(-80, 0, 50, 1, 0);
			vertices[7] = TexelVertex(80, 0, 50, 1, 1);
			vertices[8] = TexelVertex(80, 0, -50, 0, 1);

			vertices[9] = TexelVertex(80, 0, -50, 0, 1);
			vertices[10] = TexelVertex(-80, 0, -50, 0, 0);
			vertices[11] = TexelVertex(-80, 0, 50, 1, 0);			
			
			// Load the texture
			D3DXCreateTextureFromFile(device, "ground.bmp", &_ceilingTexture);

		_boxVertices->Unlock();

		_boxVertices->Lock(12*sizeof(TexelVertex), 0, (void**)&vertices, 0);

			//face
			vertices[12] = TexelVertex(80, 15, 50, 0, 0);
			vertices[13] = TexelVertex(80, 0, 50, 0, 1);
			vertices[14] = TexelVertex(-80, 0, 50, 1, 1);

			vertices[15] = TexelVertex(-80, 0, 50, 1, 1);
			vertices[16] = TexelVertex(-80, 15, 50, 1, 0);
			vertices[17] = TexelVertex(80, 15, 50, 0, 0);

			//face
			vertices[18] = TexelVertex(80, 15, -50, 0, 0);
			vertices[19] = TexelVertex(80, 0, -50, 0, 1);
			vertices[20] = TexelVertex(80, 0, 50, 1, 1);

			vertices[21] = TexelVertex(80, 0, 50, 1, 1);
			vertices[22] = TexelVertex(80, 15, 50, 1, 0);
                        vertices[23] = TexelVertex(80, 15, -50, 0, 0);
			.
                        .
                        .
			// Load the texture
			D3DXCreateTextureFromFile(device, "rocks.bmp", &_wallTexture);

		_boxVertices->Unlock();
		
	}

	return success;
}

I initally thought that locking, then unlocking and locking again would change the texture but alas. Anyone any inspiration?

satchmo

Well I've never programmed Direct3D, but one 3D API is the same as another. It would help if you showed us the rendering code too, that's probably where the problem is. It should be something like:

//setup
D3DXCreateTextureFromFile(floorTexture)
D3DXCreateTextureFromFile(wallTexture)

CreateVertexBuffer(floorVB)
CreateVertexBuffer(wallVB)

//rendering
SetTexture(floorTexture)
SetStreamSource(floorVB)
DrawPrimitive()

SetTexture(wallTexture)
SetStreamSource(wallVB)
DrawPrimitive()

The main thing to note is that textures are completely independent of vertex buffers - the way you have your setup code written suggests you might think otherwise.

Q_Ball

It can be done using one vertex buffer apparently by using an offset to reference the ceiling and the walls. like in the code vertices[0] - [11] are the ceilings and [12] - [35] are the walls. I'll get the solution thursday i just hate feeling thick :mad:

satchmo

Well sure stick it all in one VB so - the second parameter the DrawPrimitive specifies where in the VB to start. It still shouldn't affect the texturing.