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POC++ Nvidia Cg question
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2010-09-17T07:44:48.327
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2010-09-20T08:57:02.297
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I started using <code>Nvidia Cg</code> shaders recently and everything looks and works fine if I'm doing it on the <code>Nvidia GPU</code> (<code>GTS250</code> in my case). I tried launching the same (my own test application) on <code>ATI HD4650</code> and saw no output. Right after that I started experimenting with test examples (provided with <code>Nvidia Cg 3.0</code>) and 6/7 work, but the first one (which seems to be the simpliest) doesn't. Here is the shader code: <pre><code>// This is C2E1v_green from "The Cg Tutorial" (Addison-Wesley, ISBN // 0321194969) by Randima Fernando and Mark J. Kilgard. See page 38. struct C2E1v_Output { float4 position : POSITION; float3 color : COLOR; }; C2E1v_Output C2E1v_green(float2 position : POSITION) { C2E1v_Output OUT; OUT.position = float4(position,0,1); OUT.color = float3(0,1,0); return OUT; } </code></pre> I have no ideas why doesn't this simple shader work, while for example the same shader paired with the following passthru-shader does work (example 2 from the <code>Nvidia Cg SDK</code>): <pre><code>// This is C2E2f_passthru from "The Cg Tutorial" (Addison-Wesley, ISBN // 0321194969) by Randima Fernando and Mark J. Kilgard. See page 53. struct C2E2f_Output { float4 color : COLOR; }; C2E2f_Output C2E2f_passthru(float4 color : COLOR) { C2E2f_Output OUT; OUT.color = color; return OUT; } </code></pre> Did someone face the same troubles? Any ideas? Thank you. <hr> Update here: Turning on maximum debug output made the problem obvious: <pre><code>vs_3_0 shader executed in hardware vertex processing mode can only be paired with at least a ps_3_0 shader </code></pre> The first example in that package was the only one which had ONLY vertex shader in it, without any (even simple passthrough) pixel shader. I have no idea why does Nvidia Cg runtime generates incompatible shader in this case, but it obviously failed only on a somewhat old GPU (<code>ATI HD4650</code>). Anyway, I was stupid enough to work without turning the debug output on. 2 Alex Farber: I guess you can post a dummy answer, so that I can award bounty to you, because you helped me realize that I forgot to turn debugging on. Thank you.
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<c++><shader><nvidia><cg>
Title
C++ Nvidia Cg question
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