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Jacob Roman

Vertex Buffers Revisited

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Ok. Lets keep this simple. Cause I'm still having issues pulling this off. As an example, I'm only gonna have 4 polygons (all triangles, 2 per quad) for the vertex buffer. One quad will have one texture, while the other quad will have another texture. Don't worry bout the overkill part just yet cause this is to prep me for more polygons. Now, here is where I'm stuck. Where I render, I set the texture, and I draw the primitive:
Direct3D_Device.SetTexture 0, Texture1

Direct3D_Device.SetStreamSource 0, Vertex_Buffer, Len(Vertex_List(0))
Direct3D_Device.DrawPrimitive D3DPT_TRIANGLELIST, 0, 4

Now you can't set Texture2 in after setting Texture1 because it will override it. Now how on earth can I set one texture on quad1 and set another texture on quad2, using just one Vertexbuffer? Theres something I'm not doing, I just know it. C++ code is fine. I'm learning it anyways for DX9.

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Hi there Jacob Roman, how are you doing?

[The problem]
How do I set a texture for each of the quad's I'm drawing?

[The solution]
Believe it or not, it's more simple than you think :)
[source lang = c++]
Direct3D_Device.SetStreamSource 0, Vertex_Buffer, Len(Vertex_List(0));

Direct3D_Device.SetTexture(0, Texture1); //set the first texture
Direct3D_Device.DrawPrimitive(D3DPT_TRIANGLELIST, 0, 2); //draw the first quad

Direct3D_Device.SetTexture(0, Texture2); //set the second texture
Direct3D_Device.DrawPrimitive(D3DPT_TRIANGLELIST, 4, 2); //draw the second quad
//Note:(Index Position) The index position of the primitive in the vertex buffer
// Since I assume you have a vertex buffer with 8 vertices (2 Quads)
// The next quad will start at index position 4 in the vertex buffer
//Note:(Num Primitives) the number of primitives drawn is 2 (Quad)

Simple hey?
What you need to know is that whenever you set a texture, everything rendered after that will be rendered with that texture applied. So what you do is follow a simple pattern...

1) Set the texture
2) Render the primitives
1) Set the texture
2) Render the primitives

I hope this helps.
Keep cool.

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Finally some real answers. This must have been my third or forth thread asking for such things. Thanks man, I'll give that a shot. If anyone has a better solution, let me know.

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