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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