Global constants

DSHL supports some built-in global constants, which you can grab in the preshader Preshader and then use in hlsl blocks.

List of constants:

• globtm – float4x4 world-view-projection matrix

• projtm – float4x4 projection matrix

• viewprojtm – float4x4 view-projection matrix

• local_view_x, local_view_y, local_view_z, local_view_pos – 1..4 columns of inverse view matrix, in float3 format

• world_local_x, world_local_y, world_local_z, world_local_pos – 1..4 columns of world transform matrix, in float3 format

Usage example:

shader example_shader
{
  // grabbing global constants via preshader
  (vs)
  {
    viewprojtm@f44 = viewprojtm;
    world_local_x@f3 = world_local_x;
    world_local_y@f3 = world_local_y;
    world_local_z@f3 = world_local_z;
    world_local_pos@f3 = world_local_pos;
  }

  hlsl(vs)
  {
    float4 example_vs(float4 pos: POSITION0)
    {
      // using global constants in hlsl
      float3 worldPos = float3(pos.x * world_local_x + pos.y * world_local_y + pos.z * world_local_z + world_local_pos);
      return mulPointTm(worldPos, viewprojtm);
    }
  }

}

Warning

Matrix constants globtm, projtm, viewprojtm are only available for (vs) preshader.