Search code examples
directxconstantsshadervertex-shader

Way to set HLSL constant

Is there any way to set HLSL (for example) vertex shader constant from c++ code in opengl-style? I mean - no d3dx, no constant-table. Shader is already compiled with fxc.exe and set. Have only LPDIRECT3DVERTEXSHADER9 and LPDIRECT3DDEVICE9. I planned to use SetVertexShaderConstant*, but found no way to translate constant name (for example "u_mvpMatrix") to "Register number that will contain the first constant value.".

Solution

  • You need to bind your constants to registers in your shader file. Eg.

    float4 sample_constant : register(c12);

    This binds the sample_constant to register 12. You can then use SetVertexShaderConstant() to set the constant using 12 for the register.