adressing Variables in HLSL without D3DX

[virtual]

hi guys

suppose that in my HLSL pixel shader i have a variable lets say : float timer .
how could we addressing this variable from the application without ID3DXConstantTable
i am looking for SetPixelShaderConstant() way


thanks in advance

[Dan]

depending on which version of d3d you are using you can do the following:
for d3d9


float timer: register(c0);

notice that in this case the timer variable will occupy the entire c0 register.
you can pack your variable into a vector or a structure to be more efficient, like this:


float4 PackedVariables: register(c0);

or


struct MyStruct {
float t;
float t2;
float2 t3;
};
MyStruct v: register(c1);


for d3d10 and higher you can specify the register offset
so you can use overlapping registers like this:


float timer: register(c0[0]);
float some_other_var: register(c0[1]);


then you can use SetPixelShaderConstantF function:


SetPixelShaderConstantF(0, @Data, 1);//for c0 register; in this case Data should be a float vector4 type.

[virtual]

thats exactly what i am looking for , thanks alot Dan