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PostPosted: 29.07.2007, 22:08 
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Engine Developer

Joined: 10.09.2006, 15:52
Posts: 1217
Some people have reported that the Knight sample doesn't work on older cards or drivers. The reason for this is that the postprocessing shader is using a for-loop which is not supported on all hardware.

Here is a quick fix for the postprocessing.shader.xml file:

Code:
<Shader>
   <Context id="RADIALBLUR">
      <RenderConfig writeDepth="false" />
      
      <VertexShader>
         <DefCode>
         <![CDATA[
            void main( void )
            {
               gl_TexCoord[0] = gl_MultiTexCoord0;
               gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
            }
         ]]>
         </DefCode>
      </VertexShader>
      
      <FragmentShader>
         <DefCode>
         <![CDATA[
            uniform sampler2D buf0;
            uniform vec4 radblurParams;
            
            
            void main( void )
            {
               vec4 sum = vec4( 0, 0, 0, 0 );
               vec2 coord = gl_TexCoord[0].xy;
               vec2 distToCenter = vec2( 0.5, 0.5 ) - coord;
               
               
               // Unrolled loop (for older cards like Radeon 9600)
               sum += texture2D( buf0, coord );
               coord += distToCenter * radblurParams.x;
               sum += texture2D( buf0, coord );
               coord += distToCenter * radblurParams.x;
               sum += texture2D( buf0, coord );
               coord += distToCenter * radblurParams.x;
               sum += texture2D( buf0, coord );
               coord += distToCenter * radblurParams.x;
               
               gl_FragColor = sum / 4.0;
            }
         ]]>
         </DefCode>
      </FragmentShader>
   </Context>
</Shader>


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