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POHow to Draw Two Detached Rectangles in DirectX using the D3DPT_TRIANGLESTRIP Primitive Type
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  1. POHow to Draw Two Detached Rectangles in DirectX using the D3DPT_TRIANGLESTRIP Primitive Type
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    copied!<p>I am new to DirectX and I am trying to draw two rectangles in one scene using <code>D3DPT_TRIANGLESTRIP</code>. One Rectangle is no problem but two Rectangles is a whole different ball game. Yes i could draw them using four triangles drawn with the <code>D3DPT_TRIANGLELIST</code> primitive type. My curiosity is on the technic involved using <code>D3DPT_TRIANGLESTRIP</code>. Parts of the code i am using for one Rectangle using <code>D3DPT_TRIANGLESTRIP</code> is as follows:</p> <pre><code>CUSTOMVERTEX recVertex[] = { { 10.0f, 10.0f, 0.10f, 1.0f, 0xffffffff, }, // x, y, z, rhw, color { 220.0f, 10.0f, 0.10f, 1.0f, 0xffffffff, }, { 10.0f, 440.0f, 0.10f, 1.0f, 0xffffffff, }, { 220.0f, 440.0f, 0.10f, 1.0f, 0xffffffff, }, }; if( FAILED( g_pd3dDevice-&gt;CreateVertexBuffer( 4 * sizeof( CUSTOMVERTEX ), 0, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &amp;g_pVB, NULL ) ) ) { return E_FAIL; } </code></pre> <p>More vital code...</p> <pre><code>VOID* precVertex; if( FAILED( g_pVB-&gt;Lock( 0, sizeof( recVertex ), ( void** )&amp;pGameField, 0 ) ) ) { return E_FAIL; } memcpy( precVertex, recVertex, sizeof( recVertex ) ); </code></pre> <p>then Render like so...</p> <pre><code>g_pd3dDevice-&gt;SetStreamSource( 0, g_pVB, 0, sizeof( CUSTOMVERTEX ) ); g_pd3dDevice-&gt;SetFVF( D3DFVF_CUSTOMVERTEX ); g_pd3dDevice-&gt;DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 2 ); </code></pre> <p>Based on this model I could easily duplicate the code change the x and y values on the Custom Vertex and create another vertex buffer and it would work. </p> <p>Personally i feel this is not the best way to go especially considering a situation when i have to draw say 100 rectangles or something like that. The thing is, I don't have other ideas. So my question is, what is the most efficient way to draw two Rectangles with <code>D3DPT_TRIANGLESTRIP</code>? Also is there a possible way of duplicating and transforming the current rectangle?</p>
 

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