DirectX 10 Game Programming : Direct3D - Textures and Details (part 3) - Drawing the Textured Object

3. Drawing the Textured Object

It might seem like a lot of work just to map a single texture to a 3D object, but once you have the changes made to the shader, that code can be reused, simplifying your job in the future.

At this point the vertex format has been changed to support texture coordinates, the texture is loaded, and the shader knows how to map that texture to the object; finally, you can see what it looks like.

The Render function that makes use of the changes you’ve already made is shown next, with the additional SetResource call made to update the texture with the shader.

/*******************************************************************
* Render
* All drawing happens in the Render function
* Inputs - void
* Outputs - void
*******************************************************************/
void Render()
{
    if (pD3DDevice != NULL)
    {
       // clear the target buffer
       pD3DDevice->ClearRenderTargetView(pRenderTargetView, D3DXCOLOR(0.0f,
       1.0f, 1.0f, 0.0f));

        // Set the input layout
        pD3DDevice->IASetInputLayout(gModelObject.pVertexLayout);

        // Set vertex buffer
        UINT stride = sizeof(VertexPosUVStruct);
        UINT offset = 0;
        pD3DDevice->IASetVertexBuffers(0, 1, &gModelObject.pVertexBuffer,
        &stride, &offset);

        // Set primitive topology
        pD3DDevice-
        >IASetPrimitiveTopology(D3D10_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);

        // Set the texture resource view
        pBaseTextureVariable->SetResource(pTextureRV);

        // Render a model object
        D3D10_TECHNIQUE_DESC techniqueDescription;
        gModelObject.pTechnique->GetDesc(&techniqueDescription);

        // Loop through the technique passes
        for(UINT p=0; p < techniqueDescription.Passes; ++p)
        {
            gModelObject.pTechnique->GetPassByIndex(p)->Apply(0);
            pD3DDevice->Draw(gModelObject.numVertices, 0);
        }

        // display the next item in the swap chain
        pSwapChain->Present(0, 0);
    }
}

					  

Figure 3 shows what the texture-mapped quad should look like.

Figure 3. The texture-mapped quad.