I am putting the 'finishing' touch on the shader tutorial (Well 'basic'
tutorial is complete, but I want to shows alternatives when writing
things). But, by simplifying things I am getting in to some issues. I am
describing in the tutorial the template functionality through that
little snippet:
<shader compiler="xmlshader" name="diffuse_cg">
<technique priority="200">
<pass>
<buffer source="texture coordinate 0" destination="texture
coordinate 0" />
<vp plugin="glcg" file="/this/diffuse_cg.cgvp" />
<texture name="tex diffuse" destination="TexDiffuse" />
<fp plugin="glcg">
<cgfp>
<variablemap variable="mat hilitecolor"
destination="hiliteColor" />
<program>
<![CDATA[
struct vertex2fragment {
float4 Hposition : POSITION;
float2 TexCoord : TEXCOORD0;
};
float4 main (vertex2fragment IN,
uniform sampler2D TexDiffuse,
uniform float4 hiliteColor) : COLOR
{
_/* <?if vars."mat hilitecolor"?>
return tex2D (TexDiffuse, IN.TexCoord) + hiliteColor;
<?else?>
return tex2D (TexDiffuse, IN.TexCoord);
<?endif?>*/_
}
]]>
</program>
</cgfp>
</fp>
</pass>
</technique>
</shader>
And nothing happens (The fragment shaders does not get compiled),
because I am guessing (not sure) that the <![CDATA[ ... ]]> protect from
any intervention of the template expansion mechanism inside the Cg
program. Am I right ? Then what would be a reasonable workaround ? Note
that the 'cgvp' is used unchanged succesfully otherwise, so I know it is
not the
culprit.
Best regards,
Sebastien.
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