Something

 if (!IS_PLAYER_ENEMY(refEnt->entityNum)) {
                if (visible) {
                        refEnt->customShader = eth.friendVisibleShader;
                        refEnt->shaderRGBA[0] = seth.value[VAR_FRIEND_VISIBLE_RED];
                        refEnt->shaderRGBA[1] = seth.value[VAR_FRIEND_VISIBLE_GREEN];
                        refEnt->shaderRGBA[2] = seth.value[VAR_FRIEND_VISIBLE_BLUE];
                } else {
                        refEnt->customShader = eth.friendNotVisibleShader;
                        refEnt->shaderRGBA[0] = seth.value[VAR_FRIEND_NOT_VISIBLE_RED];
                        refEnt->shaderRGBA[1] = seth.value[VAR_FRIEND_NOT_VISIBLE_GREEN];
                        refEnt->shaderRGBA[2] = seth.value[VAR_FRIEND_NOT_VISIBLE_BLUE];
                }
 
                dlightColor = (float *)&eth.friendVisibleColor;
                if (seth.value[VAR_DLIGHT] == DLIGHT_ON) {
                        addRadius = -10.0;
                        addIntens = -10.0;
                }
        } else {
                // treat all non-players as enemy entities.
                if (visible) {
                        refEnt->customShader = eth.enemyVisibleShader;
                        refEnt->shaderRGBA[0] = seth.value[VAR_ENEMY_VISIBLE_RED];
                        refEnt->shaderRGBA[1] = seth.value[VAR_ENEMY_VISIBLE_GREEN];
                        refEnt->shaderRGBA[2] = seth.value[VAR_ENEMY_VISIBLE_BLUE];
                } else {
                        refEnt->customShader = eth.enemyNotVisibleShader;
                        refEnt->shaderRGBA[0] = seth.value[VAR_ENEMY_NOT_VISIBLE_RED];
                        refEnt->shaderRGBA[1] = seth.value[VAR_ENEMY_NOT_VISIBLE_GREEN];
                        refEnt->shaderRGBA[2] = seth.value[VAR_ENEMY_NOT_VISIBLE_BLUE];
                }
 
                dlightColor = (float *)&eth.enemyVisibleColor;
                if (seth.value[VAR_DLIGHT] == DLIGHT_ON) {
                        addRadius = 10.0;
                        addIntens = 10.0;
                }
        }
}